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36 results about "Magnetocardiography" patented technology
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Magnetocardiography (MCG) is a technique to measure the magnetic fields produced by electrical currents in the heart using extremely sensitive devices such as the superconducting quantum interference device (SQUID). If the magnetic field is measured using a multichannel device, a map of the magnetic field is obtained over the chest; from such a map, using mathematical algorithms that take into account the conductivity structure of the torso, it is possible to locate the source of the activity. For example, sources of abnormal rhythms or arrhythmia may be located using MCG.
Use of machine learning for classification of magneto cardiograms
InactiveUS20070167846A1Exceeding quality of classificationCharacter and pattern recognitionMedical automated diagnosisMagnetocardiographyKernel method
The use of machine learning for pattern recognition in magnetocardiography (MCG) that measures magnetic fields emitted by the electrophysiological activity of the heart is disclosed herein. Direct kernel methods are used to separate abnormal MCG heart patterns from normal ones. For unsupervised learning, Direct Kernel based Self-Organizing Maps are introduced. For supervised learning Direct Kernel Partial Least Squares and (Direct) Kernel Ridge Regression are used. These results are then compared with classical Support Vector Machines and Kernel Partial Least Squares. The hyper-parameters for these methods are tuned on a validation subset of the training data before testing. Also investigated is the most effective pre-processing, using local, vertical, horizontal and two-dimensional (global) Mahanalobis scaling, wavelet transforms, and variable selection by filtering. The results, similar for all three methods, were encouraging, exceeding the quality of classification achieved by the trained experts. Thus, a device and associated method for classifying cardiography data is disclosed, comprising applying a kernel transform to sensed data acquired from sensors sensing electromagnetic heart activity, resulting in transformed data, prior to classifying the transformed data using machine learning.
Owner:CARDIOMAG IMAGING
Methods and apparatuses for 3D imaging in magnetoencephalography and magnetocardiography
InactiveUS20110313274A1Improve accuracyEffective informationDiagnostic recording/measuringSensorsMagnetocardiographyReconstruction problem
This invention discloses methods and apparatuses for 3D imaging in Magnetoencephalography (MEG), Magnetocardiography (MCG), and electrical activity in any biological tissue such as neural / muscle tissue. This invention is based on Field Paradigm founded on the principle that the field intensity distribution in a 3D volume space uniquely determines the 3D density distribution of the field emission source and vice versa. Electrical neural / muscle activity in any biological tissue results in an electrical current pattern that produces a magnetic field. This magnetic field is measured in a 3D volume space that extends in all directions including substantially along the radial direction from the center of the object being imaged. Further, magnetic field intensity is measured at each point along three mutually perpendicular directions. This measured data captures all the available information and facilitates a computationally efficient closed-form solution to the 3D image reconstruction problem without the use of heuristic assumptions. This is unlike prior art where measurements are made only on a surface at a nearly constant radial distance from the center of the target object, and along a single direction. Therefore necessary, useful, and available data is ignored and not measured in prior art. Consequently, prior art does not provide a closed-form solution to the 3D image reconstruction problem and it uses heuristic assumptions. The methods and apparatuses of the present invention reconstruct a 3D image of the neural / muscle electrical current pattern in MEG, MCG, and related areas, by processing image data in either the original spatial domain or the Fourier domain.
Owner:SUBBARAO MURALIDHARA
Use of machine learning for classification of magneto cardiograms
InactiveUS7742806B2Medical automated diagnosisCharacter and pattern recognitionKernel methodMagnetocardiography
The use of machine learning for pattern recognition in magnetocardiography (MCG) that measures magnetic fields emitted by the electrophysiological activity of the heart is disclosed herein. Direct kernel methods are used to separate abnormal MCG heart patterns from normal ones. For unsupervised learning, Direct Kernel based Self-Organizing Maps are introduced. For supervised learning Direct Kernel Partial Least Squares and (Direct) Kernel Ridge Regression are used. These results are then compared with classical Support Vector Machines and Kernel Partial Least Squares. The hyper-parameters for these methods are tuned on a validation subset of the training data before testing. Also investigated is the most effective pre-processing, using local, vertical, horizontal and two-dimensional (global) Mahanalobis scaling, wavelet transforms, and variable selection by filtering. The results, similar for all three methods, were encouraging, exceeding the quality of classification achieved by the trained experts. Thus, a device and associated method for classifying cardiography data is disclosed, comprising applying a kernel transform to sensed data acquired from sensors sensing electromagnetic heart activity, resulting in transformed data, prior to classifying the transformed data using machine learning.
Owner:CARDIOMAG IMAGING
First-order gradient compensation module and method for unmask magnetocardiography
ActiveCN102988038AImprove signal-to-noise ratioImprove diagnostic capabilitiesDiagnostic recording/measuringSensorsMagnetocardiographyComputer science
The invention relates to a first-order gradient compensation module and method for an unmask magnetocardiography. The first-order gradient compensation module is characterized by consisting of three introduced z-directional reference magnetometers and z-directional reference magnetometers in a known triaxial module, wherein the three introduced z-directional reference magnetometers are respectively SQz1, SQz2 and SQz3, the SQz1 and the SQz2 and the SQz of the triaxial module are arranged in the same plane, and the SQz3 and the SQz are in the same axes. The compensation method comprises the following steps of 1) constructing the first-order gradient compensation module and keeping the relative position of the module and gradiometer to be constant; 2) performing low-temperature testing and optimizing software algorithm; and 3) collecting a real solid magnetic signal. The first-order gradient compensation module is not limited for an unmask magnetocardiography, and is suitable for multi-channel unmask or masked magnetocardiography.
Owner:漫迪医疗仪器(上海)有限公司
Magnetocardiography diagnosing system and magnetocardiography applying same
ActiveCN107361760AClear interfaceEasy to operateDiagnostic recording/measuringSensorsMagnetocardiographyData acquisition
The invention provides a magnetocardiography and a magnetocardiography diagnosing system applied to the same. The system specifically comprises a user login part, a user management part, a patient information part, a parameter configuration part, a device debugging part, a data collecting part, a magnetocardiographic balance part, an imaging processing part, a diagnostic report part, a system help part, a system exit part and other parts. The imaging processing part can not only display magnetic field distribution conditions and configuration and orientation of electric current density, but also display evolution conditions of isomagnetic charts and electric current density charts along with the time. Additionally, the magnetocardiographic software further provides a plurality of parameters for judging the health conditions of heart and normal ranges of the parameters, so that doctors can conveniently and quantitatively evaluate the health conditions of heart. Compared with the prior art, the software is integrated with the functions of data collection, data filtering, imaging analysis and report diagnosis, and has the advantages of being distinct in interface, easy to operate, and capable of being directly adopted by clinicians, and providing a significant reference value for clinical diagnosis of cardiovascular diseases.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Probe of magnetocardiograph
ActiveCN101194832AReduce the number of timesReduce measurement errorDiagnostic recording/measuringSensorsObservational errorMagnetocardiography
The invention discloses a magnetocardiography probe, which solves the problem that a probe device needs to be horizontally and longitudinally moved time after time when finishing one time MCG base point measurement, thereby easily generating measurement error. The invention comprises a non-magnetic Dewar casing (3), a fixed support (5), a main sensor (8) and a reference sensor, wherein the fixed support (5) is arranged on the non-magnetic Dewar casing (3), a vacuum insulating layer (4) is formed between the non-magnetic Dewar casing (3) and the fixed support (5), the main sensor (8) comprises six SQUID sensors which are arranged side by side in line along the bottom center line of the fixed support (5), and the reference sensor is composed of one or two SQUID sensors. A first-order or second-order gradient meter is constituted by the main sensor (8) and the reference sensor to realize the function of signal detection. The probe device is moved on a direction to finish the measurement of 36 MCG base points when measuring the MCG. The invention has the advantages of reasonable structure and design, high measuring precision and simple operation.
Owner:BEIJING SQUID QUANTUM TECH
Magnetocardiograph
ActiveUS20050192502A1Prevent diseaseShorten the time periodCatheterDiagnostic recording/measuringMagnetocardiographyAssistive technology
In magnetocardiography, an assisting technique for a doctor diagnosing a heart disease will be provided. In the magnetocardiography, magnetism to be generated from a subject's heart is measured by a magnetic sensor, and from this measured data, a position of center of gravity of excitement wave front in a cardiac muscle excitement propagation process and a transition vector (wave front vector) is calculated by an analyzing computer. With this wave front vector as a feature parameter, the Mahalanobis' distance is calculated from a data base obtained by diagnosing in the past, a possibility (probability) of the subject having a heart disease is presumed on the basis of the Bayes' theorem for displaying. Also, by superimposing on a heart picture, the wave front vector position is displayed, and a cluster classification position in the wave front vector is displayed. Also, by the similar retrieval, another subject extremely similar to the subject in the feature parameter will be retrieved from the data base for screen displaying.
Owner:WASEDA UNIV +1
Magnetocardiograph
ActiveUS7395107B2Preventing the doctor from overlookingEasy to operateCatheterMicrowave therapyMagnetocardiographyAssistive technology
In magnetocardiography, an assisting technique for a doctor diagnosing a heart disease will be provided. In the magnetocardiography, magnetism to be generated from a subject's heart is measured by a magnetic sensor, and from this measured data, a position of center of gravity of excitement wave front in a cardiac muscle excitement propagation process and a transition vector (wave front vector) is calculated by an analyzing computer. With this wave front vector as a feature parameter, the Mahalanobis' distance is calculated from a data base obtained by diagnosing in the past, a possibility (probability) of the subject having a heart disease is presumed on the basis of the Bayes' theorem for displaying. Also, by superimposing on a heart picture, the wave front vector position is displayed, and a cluster classification position in the wave front vector is displayed. Also, by the similar retrieval, another subject extremely similar to the subject in the feature parameter will be retrieved from the data base for screen displaying.
Owner:WASEDA UNIV +1
Full-tensor magnetocardiography probe and producing method thereof
The invention provides a full-tensor magnetocardiography probe and a producing method thereof. The full-tensor magnetocardiography probe comprises a full-tensor probe support, a detection layer SQUID (superconducting quantum interference device) magnetometer and a reference layer SQUID magnetometer, wherein the full-tensor probe support comprises a detection layer support, a reference layer support and middle connecting rods, the detection layer support is arranged at bottom ends of the middle connecting rods, and the reference layer support is arranged at top ends of the middle connecting rods; the detection layer SQUID magnetometer comprises a plurality of SQUID magnetometers which are arranged on the detection layer support and used for synthesizing five independent first-order gradients and required uniform components; the reference layer SQUID magnetometer comprises three SQUID magnetometers which are arranged in three orthogonal directions of the reference layer support to form a three-axis magnetometer. With the adoption of the full-tensor magnetocardiography probe and the producing method thereof, the five independent first-order gradients and the 2-3 uniform components of a magnetic field can be acquired, and noises of the five independent first-order gradients are effectively inhibited, so that more magnetic field and electrical activity information of magnetocardiograms is acquired.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Three-dimensional heart magnetic source positioning method, system and server
InactiveCN106901717AReduce the number of iterationsImprove efficiencyDiagnostic recording/measuringSensorsTime domainMagnetic field gradient
The invention provides three-dimensional heart magnetic source positioning method, system and server. The three-dimensional magnetic source positioning method comprises the following steps: after measurement in an appointed region above a human chest through a full-tensor magnetocardiography, acquiring homogeneous field component data of one or more measuring points and first order gradient tensor data corresponding to the homogeneous field component data; according to a three-dimensional prior array established in advance, reestablishing a heart magnetic source, and calculating a fit measuring point magnetic field gradient field value; and screening the heart magnetic source corresponding to a minimum value of an error function by utilizing the error function, used for screening an optimal solution, of the heart magnetic source. The three-dimensional heart magnetic source positioning method, system and server have higher resolution to a space discrete distribution source and a time domain overlapping source based on three-dimensional full-tensor magnetocardiogram data; and meanwhile, a three-dimensional prior array optimization algorithm is established, so that the iteration number of the algorithm and the positioning errors are reduced, and the algorithm efficiency is improved.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Detection coil of superconducting magnetic sensor and detector
ActiveCN105911488AIncrease pickup strengthImprove signal-to-noise ratioMagnetic field measurement using superconductive devicesSignal-to-noise ratio (imaging)Magnetocardiography
The invention provides a detection coil of a superconducting magnetic sensor and a detector. The detection coil comprises a superconducting gradient coil being a planar coil; the superconducting gradient coil having a balanced superconducting winding structure consists of an environment magnetic field balance area and a detected signal induction area, wherein the two areas are distributed symmetrically; and high-magnetic-permeability materials are arranged at the environment magnetic field balance area and the detected signal induction area. In addition, a detector is formed by the superconducting magnetic sensor and a superconducting quantum interference device (SQUID)-based magnetic sensor. According to the invention, the high-magnetic-permeability materials are added into the detection coil with the balanced structure, thereby realizing capturing of more weak magnetic signals and thus increasing a signal to noise ratio of the detected signal. The detection coil and the detector are applied to detection of a weak magnetic field like fetus magnetocardiographic detection; the weak magnetocardiographic signal detection capability can be improved; and the fetus heart signal monitoring capability by the magnetocardiography can be enhanced. Therefore, the detection coil and the detector have important significance.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Biological magnetic diagram instrument probe and magnetocardiography instrument
InactiveCN107397544AReduce evaporation rateReduce heatDiagnostic recording/measuringSensorsMagnetocardiographyRoom temperature
The invention provides a biological magnetic diagram instrument probe. The biological magnetic diagram instrument probe comprises a shell and a probe body, wherein the shell comprises a first containing part filled with first liquid inert gas; the probe body is arranged in the shell; the probe body comprises an air outlet, an electronic component, and a second containing part filled with second liquid inert gas; the first liquid inert gas is used for cooling the electronic component; the temperature of the second liquid inert gas is higher than the temperature of the first liquid inert gas and lower than the temperature of the air outlet; the second containing part is arranged in a conduction path through which first inert gas obtained after gasifying of the first liquid inert gas is conveyed to the air outlet from the first containing part. For the biological magnetic diagram instrument probe provided by the invention, a liquid nitrogen interlayer is arranged between liquid helium and the air outlet, so that helium gas evaporated by the liquid helium reaches the room temperature only after passing through the liquid nitrogen layer, therefore, the evaporation rate of liquid helium is greatly reduced, and the additional noise is avoided.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Magnetocardiography, compensation and optimization method based on same, system and server
ActiveCN106343999AImprove signal-to-noise ratioImprove fidelityDiagnostic recording/measuringSensorsSignal-to-noise ratio (imaging)Magnetocardiography
The invention provides a magnetocardiography, a compensation and optimization method based on the same, a system and a server. The compensation and optimization method comprises the following steps that second magnetic field signals produced by magnetometers on a super-conducing quantum interference device array layer are compensated by utilizing first magnetic field signals produced by compensation magnetometers on a compensation layer in a preset compensation mode to form third magnetic field signals after compensation; evaluation parameters of third magnetic field signals after compensation are calculated, the third magnetic field signals are evaluated according to comprehensive evaluations of evaluation parameters to optimize the compensation layer and determine the best compensation channel on the compensation layer. The residual magnetic field in a shielded room environment is effectively inhibited, so that 36 SQUID magnetocardiogram signals having high signal-to-noise ratio and high fidelity are output in a column mode.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Magnetocardiography measurement system
PendingCN111000549ALow costReduce volumeMedical imagingDiagnostic recording/measuringMagnetic measurementsMagnetocardiography
The invention provides a magnetocardiography measurement system, which comprises: a detection component including a TMR magnetoresistive probe; a data acquisition and analysis unit connected with thedetection component and used for acquiring signals detected by the detection component and analyzing the detected signals; a magnetic field generation system used for generating a preset magnetic field value; a magnetic field shielding system connected with the magnetic field generation system so as to shield an external magnetic field through the magnetic field shielding system; and an auxiliarydetection equipment used for comparing the magnetocardiography measurement result provided by the invention. Through the technical scheme provided by the invention, the technical problem of high costof a magnetocardiography measurement system in the prior art can be solved.
Owner:YANGZHOU UNIV
Heart magnetic field simulation system based on Helmholtz coil array
ActiveCN113520399AAdjustable durationAmplitude can be adjustedDiagnostic recording/measuringSensorsLow noiseHelmholtz coil
The invention relates to a heart magnetic field simulation system based on a Helmholtz coil array. The system mainly comprises a magnetic shielding barrel (room), a low-noise program control current source and the Helmholtz coil array. The magnetic shielding barrel (room) is used for shielding an earth magnetic field and other external magnetic fields and providing working conditions for the heart magnetic field generated by measurement of the atom magnetometer, the low-noise program-controlled current source is used for generating current needed for simulating the heart magnetic field, and meanwhile the program-controlled current source has the advantage of facilitating simulation of a dynamic signal system. The Helmholtz coil array is used for generating a heart magnetic field in the normal direction of the thoracic cavity surface in magnetocardiography measurement. The system provided by the invention can generate the normal cardiac magnetic field of the thoracic cavity surface, is applied to research in the medical field, and facilitates simulation of the cardiac magnetic field of a patient and calibration of an atom magnetometer probe.
Owner:BEIHANG UNIV
Three-dimensional imaging method based on wearable magnetocardiogram three-dimensional measuring device
ActiveCN114287943AImprove portabilityLow costDiagnostic recording/measuringWater resource assessmentHuman bodyReal time analysis
The invention relates to a three-dimensional imaging method based on a wearable magnetocardiography three-dimensional measuring device, and the wearable magnetocardiography three-dimensional measuring device obtains all three-dimensional magnetocardiography signals of a human body through a plurality of measuring sensors fixed by an adjustable vest in a magnetic shielding space. The method comprises the following steps: screening transmitted three-dimensional magnetocardiogram signals according to preset amplitude information, carrying out noise reduction and dimension reduction processing on the screened magnetocardiogram signals by adopting an independent component analysis and empirical mode decomposition method, and establishing a three-dimensional grid model comprising a trunk region, a heart region and a double-lung region based on a CT (Computed Tomography) image of a human body, a lead field matrix of magnetic field conduction from the heart to the position of the in-vitro sensor is obtained in a forward solving mode, and magnetic field distribution, used for real-time display, of the outer membrane surface of the heart is reversely solved based on the lead field matrix and the multi-channel signals. The wearable magnetocardiogram three-dimensional measuring device can synchronously obtain the three-dimensional magnetocardiogram signals, analyzes and displays the three-dimensional magnetocardiogram signals in real time, and is low in cost and convenient to carry.
Owner:HANGZHOU INNOVATION RES INST OF BEIJING UNIV OF AERONAUTICS & ASTRONAUTICS
Magnetocardiogram generating method and system
ActiveCN107374610AClear imagingUniform color distributionDiagnostic recording/measuringSensorsPower flowMagnetocardiography
The invention provides a magnetocardiogram generating method and system applied to a magnetocardiography. The magnetocardiogram generating method comprises the steps that firstly, the data in one cycle of each channel is intercepted, one point is selected from the intercepted data, the data of each channel at the point is get out, and then the position coordinates corresponding to the channels on the upper chest are calculated; secondly, the data of all the channels at the point correspond to the coordinates; thirdly, the two-dimensional magnetocardiogram data which are well arranged according to positions is subjected to two-dimensional interpolation; fourthly, the two-dimensional data obtained after interpolation is subjected to color table query; fifthly, a magnetocardiogram is drawn. The magnetocardiogram generated by using the method is clear in image and uniform in color distribution, and positive and negative dipoles can be clearly seen in the T wave band. Besides, if the magnetocardiograms from the S band to the T band of the QRS wave at different points are drawn according to a set step length, spatio-temporal evolution process of the heart activity current can be seen, and a doctor can diagnose whether a patient suffers from a heart disease or not according to the number of the dipoles of the magnetocardiogram and the evolution direction of the heart activity current.
Owner:漫迪医疗仪器(上海)有限公司
Position adjustment apparatus for adjusting position of detection device and magnetocardiography instrument
ActiveUS20220304771A1Easy to pushControl freedomDiagnostic recording/measuringSurgical instrument supportMagnetocardiographyClassical mechanics
A position adjustment apparatus for adjusting a position of a detection device, and a magnetocardiography instrument are provided. The position adjustment apparatus includes: two support assemblies, a lifting frame, and at least one height adjustment assembly. The position adjustment apparatus of the present disclosure enables free control over the height of the lifting frame by providing support rods and the height adjustment assembly comprising a pulley block.
Owner:BEIJING X MAG TECH LTD
Positioning method and system for myocardial ischemia lesion position, storage medium and terminal
ActiveCN108577825AStrong clinical feasibilitySimple and fast operationDiagnostic recording/measuringSensorsPower flowMagnetocardiography
The invention discloses a positioning method and system for the myocardial ischemia lesion position, a storage medium and a terminal. The positioning method comprises the following steps that a magnetocardiogram dataset collected by a multichannel magnetocardiography is pre-processed, and the averaged magnetocardiogram dataset of a T wave band is obtained; based on the magnetocardiogram dataset ofthe T wave band, the magnetic strength obtained by all channels of the multichannel magnetocardiography and the channel positions of all channels of the multichannel magnetocardiography, an iso-magnetic map and a current density map of the T wave band are obtained; based on the iso-magnetic map and the current density map, feature parameters related to the myocardial ischemia lesion position areextracted; and the myocardial ischemia lesion position is judged according to the feature parameters. According to the positioning method and system for the myocardial ischemia lesion position, the storage medium and the terminal, signal features of the magnetocardiogram are analyzed, the distribution rule of the feature parameters is excavated, and thus positioning of the myocardial ischemia lesion position is assisted according to the feature parameters sensitive to the myocardial ischemia position.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Position adjusting device for adjusting position of detection equipment and magnetocardiography instrument
ActiveCN112957048AAchieve regulationAchieve freedom of controlDiagnostic recording/measuringSurgical instrument supportMagnetocardiographyElectric machinery
The invention provides a position adjusting device for adjusting the position of detection equipment and a magnetocardiography instrument. The position adjusting device comprises two supporting assemblies, a lifting frame and at least one height adjusting assembly. According to the position adjusting device, free control over the height of the lifting frame is achieved by arranging supporting rods and the at least one height adjusting assembly comprising pulley blocks. A user can adjust the height of the detection equipment by manually rotating a first pulley or a second pulley, and the operation is simple and convenient. Besides, no electric device such as a motor is arranged in the position adjusting device of the embodiment, and the position adjustment of the detection equipment completely depends on manual operation, so that the position adjusting device is particularly suitable for detection environments where the electric device is not suitable for being used.
Owner:BEIJING X MAG TECH LTD
Device for calibrating magnetic field-voltage coefficient of multi-channel magnetocardiogram detection system
PendingCN114002634AHigh precisionImprove convenienceElectrical measurementsMagnetocardiographyExcitation current
The invention discloses a device for calibrating a magnetic field-voltage coefficient of a multi-channel magnetocardiogram detection system. The device comprises a current excitation device which outputs a corresponding excitation current to a magnetic field generation mechanism based on a current control instruction, a magnetic field generating mechanism which generates a uniform magnetic field in a magnetometer area of the multi-through magnetograph, and a signal acquisition and analysis device which acquires voltage signals output by all the magnetometers, records voltage values of all the magnetometers under different magnetic field intensities, and fits voltage-magnetic field relation curves of all the magnetometers, wherein the fitting slope of the voltage-magnetic field relation curves is the voltage-magnetic field coefficient, and a magnetometer is excited by the uniform magnetic field to generate a voltage signal. The range of a uniform region of a magnetic field generated by the biplane coil and the uniformity of the magnetic field in the uniform region are larger than those of a common coil so that the accuracy of voltage-magnetic field coefficient calibration is improved; and an open space is formed between the double-plane coils so that the device is suitable for placing a magnetocardiography system with a complex structure and a relatively large volume, and the convenience of calibration operation is improved.
Owner:ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
Method, system, medium and device for synchronizing multiple scanning data of magnetocardiography
ActiveCN112932492ASynchronize multi-channel magnetic field dataDiagnostic recording/measuringSensorsData synchronizationAlgorithm
The invention provides a method, a system, a medium and a device for synchronizing multiple scanning data of a magnetocardiography, and the method comprises the steps: acquiring n times of magnetocardiogram data based on a plurality of detection channels, obtaining magnetocardiogram data from a first region to an nth region, and obtaining magnetocardiogram data of an (n+1)th region; respectively selecting the magnetocardiogram data of one detection channel included by the magnetocardiogram data of the (n+1)th region from the magnetocardiogram data of the first region to the nth region, and obtaining common point magnetocardiogram data of the first region to the nth region; identifying R peaks of the common dessert magnetic data from the first region to the nth region, and obtaining the R peaks of the common dessert magnetic data from the first region to the nth region; selecting any one of R peaks of the common point magnetic data of the first region and the nth region as a reference R peak, and calculating the time relation between other R peaks and the reference R peak; performing translation based on the moment relation, and obtaining synchronous multi-channel magnetocardiogram data. The method is used for obtaining the synchronous multi-channel magnetocardiogram data based on the single magnetocardiogram instrument.
Owner:上海跃磁生物科技有限公司
Auxiliary positioning method, system and equipment for current source of magnetocardiography
ActiveCN105769168AWide clinical applicabilityDiagnostic signal processingSensorsThoracic structureMagnetocardiography
The invention provides an auxiliary positioning method, system and equipment for a current source of magnetocardiography. The auxiliary positioning method for the current source of magnetocardiography comprises steps as follows: multiple magnetic dipoles fixedly adsorbed on the thoracic cavity of a human body are driven by alternating current at different frequencies to generate space magnetic fields at different frequency points; space magnetic field signals of the thoracic cavity of the human body are detected; intensity information of the space magnetic fields at different frequency points is acquired; the intensity information of the space magnetic fields at different frequency points is subjected to second preset treatment, so that a space position corresponding to the largest magnetic field value in the space magnetic field at each frequency point is acquired; magnetocardiography signals of the human body are subjected to third preset treatment, and the space position corresponding to the maximum current intensity of the magnetocardiography signals is acquired; the space position corresponding to the largest magnetic field value and the space position corresponding to the maximum current intensity are combined for auxiliary positioning. Positioning information can be acquired through measurement, mark points vary from person to person and are free from influence of the figure structure of the human body, and the auxiliary positioning method, system and equipment have wide clinical applicability.
Owner:漫迪医疗仪器(上海)有限公司
Magnetocardiograph, compensation optimization method, system and server based thereon
ActiveCN106343999BImprove signal-to-noise ratioImprove fidelityDiagnostic recording/measuringSensorsMagnetocardiographyResidual magnetic field
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Calibration of two synchronized motion pictures from magnetocardiography and echocardiography
A method of calibration for combining two synchronized motion pictures from Magnetocardiography (MCG) and Echocardiography (ECOCG) is accomplished here.To combine the two motion pictures of MCG and ECOCG is to locate the current dipole sources from a MCG onto a simultaneously beating heart images from an ECOCG. For this purpose, it needs to calibrate the space locations and orientations for the two motion pictures.In embodiments, the calibration of the spaces and orientation is accomplished by choosing two specific events during a cardiac cycle when the space locations and the orientations of the events for both the MCG and the ECOCG are relatively easy to be determined. Then the two pairs of corresponding space points can be lined up by a coordinate transformation.
Owner:NI XUAN ZHONG
A snap-on heat-insulating wearable system for human magnetocardiogram measurement
ActiveCN111345805BLow costImprove efficiencyDiagnostic recording/measuringSensorsHuman bodyInsulation layer
Owner:BEIHANG UNIV
Probe of magnetocardiograph
ActiveCN100508879CReduce the number of timesReduce measurement errorDiagnostic recording/measuringSensorsObservational errorMagnetocardiography
The invention discloses a magnetocardiography probe, which solves the problem that a probe device needs to be horizontally and longitudinally moved time after time when finishing one time MCG base point measurement, thereby easily generating measurement error. The invention comprises a non-magnetic Dewar casing (3), a fixed support (5), a main sensor (8) and a reference sensor, wherein the fixed support (5) is arranged on the non-magnetic Dewar casing (3), a vacuum insulating layer (4) is formed between the non-magnetic Dewar casing (3) and the fixed support (5), the main sensor (8) comprises six SQUID sensors which are arranged side by side in line along the bottom center line of the fixed support (5), and the reference sensor is composed of one or two SQUID sensors. A first-order or second-order gradient meter is constituted by the main sensor (8) and the reference sensor to realize the function of signal detection. The probe device is moved on a direction to finish the measurement of 36 MCG base points when measuring the MCG. The invention has the advantages of reasonable structure and design, high measuring precision and simple operation.
Owner:BEIJING SQUID QUANTUM TECH
Method, system, medium and terminal for analyzing cardiac ventricular septal abnormality based on magnetocardiography
ActiveCN110074774BRealize the judgment functionImprove accuracyDiagnostic recording/measuringSensorsData setMagnetocardiography
The present invention provides a magnetocardiogram-based analysis method, system, medium and terminal for cardiac interventricular septal abnormalities, comprising the following steps: preprocessing magnetocardiogram data sets collected by a multi-channel magnetocardiograph, and obtaining QRS wave bands Magnetocardiogram cycle data set; based on the QRS wave band magnetocardiogram cycle data set, the magnetic field intensity recorded by each magnetic channel of the multi-channel magnetocardiograph and the position information of the magnetic channel, obtain the magnetic field, etc. A magnetic map, and obtain a current density map based on the magnetic field and other magnetic maps; based on the current density map, extract characteristic parameters related to the cardiac interventricular septum; judge whether the cardiac interventricular septum is abnormal according to the characteristic parameters. The present invention analyzes the signal characteristics of the QRS wave in the magnetocardiogram, extracts the characteristic parameters related to the cardiac interventricular septum, and links it with the original cardiac electrical activity law, thereby realizing the function of judging whether the cardiac interventricular septum is abnormal, and improving the heart function. Accuracy of judgment of abnormality of interventricular septum.
Owner:漫迪医疗仪器(上海)有限公司
A first-order gradient compensation module and method for unshielded magnetocardiograph
ActiveCN102988038BImprove signal-to-noise ratioImprove diagnostic capabilitiesDiagnostic recording/measuringSensorsMagnetocardiographyComputational physics
The invention relates to a first-order gradient compensation module and method for an unmask magnetocardiography. The first-order gradient compensation module is characterized by consisting of three introduced z-directional reference magnetometers and z-directional reference magnetometers in a known triaxial module, wherein the three introduced z-directional reference magnetometers are respectively SQz1, SQz2 and SQz3, the SQz1 and the SQz2 and the SQz of the triaxial module are arranged in the same plane, and the SQz3 and the SQz are in the same axes. The compensation method comprises the following steps of 1) constructing the first-order gradient compensation module and keeping the relative position of the module and gradiometer to be constant; 2) performing low-temperature testing and optimizing software algorithm; and 3) collecting a real solid magnetic signal. The first-order gradient compensation module is not limited for an unmask magnetocardiography, and is suitable for multi-channel unmask or masked magnetocardiography.
Owner:漫迪医疗仪器(上海)有限公司
Diagnosis system of magnetocardiograph and magnetocardiograph using the system
ActiveCN107361760BClear interfaceEasy to operateDiagnostic recording/measuringSensorsMagnetocardiographyDiagnostic system
The invention provides a magnetocardiography and a magnetocardiography diagnosing system applied to the same. The system specifically comprises a user login part, a user management part, a patient information part, a parameter configuration part, a device debugging part, a data collecting part, a magnetocardiographic balance part, an imaging processing part, a diagnostic report part, a system help part, a system exit part and other parts. The imaging processing part can not only display magnetic field distribution conditions and configuration and orientation of electric current density, but also display evolution conditions of isomagnetic charts and electric current density charts along with the time. Additionally, the magnetocardiographic software further provides a plurality of parameters for judging the health conditions of heart and normal ranges of the parameters, so that doctors can conveniently and quantitatively evaluate the health conditions of heart. Compared with the prior art, the software is integrated with the functions of data collection, data filtering, imaging analysis and report diagnosis, and has the advantages of being distinct in interface, easy to operate, and capable of being directly adopted by clinicians, and providing a significant reference value for clinical diagnosis of cardiovascular diseases.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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