33 results about "Ecg gating" patented technology

A method is provided for treating a heart arrhythmia having the steps of obtaining cardiac digital data from a medical imaging system utilizing an ECG gated protocol; generating a series of 3D images of a cardiac chamber and its surrounding structures, preferably the left atrium and pulmonary veins, from this cardiac digital data at select ECG trigger points that correspond to different phases of the cardiac cycle; registering these 3D images with an interventional system; acquiring ECG signals from the patient in real-time; transmitting these ECG signals to the interventional system; synchronizing the registered 3D images with trigger points on the transmitted ECG signals to generate a 4D image; visualizing this 4D image upon the interventional system in real-time; visualizing a catheter over the 4D image upon the interventional system; navigating the catheter within the cardiac chamber utilizing the 4D image; and using the catheter to treat the cardiac chamber, preferably with ablation.

A method is provided for treatment of heart failure having the steps of obtaining cardiac digital data from a medical imaging system utilizing an ECG gated protocol; generating a series of 3D images of a cardiac chamber and its surrounding structures, preferably the left ventricle and coronary sinus, from this cardiac digital data at select ECG trigger points that correspond to different phases of the cardiac cycle; registering these 3D images with an interventional system; acquiring ECG signals from the patient in real-time; transmitting these ECG signals to the interventional system; synchronizing the registered 3D images with trigger points on the transmitted ECG signals to generate a 4D image; visualizing this 4D image upon the interventional system in real-time; visualizing a pacing / defibrillation lead over the 4D image upon the interventional system; navigating the pacing / defibrillation lead utilizing the 4D image; and placing the pacing / defibrillation lead over the cardiac chamber at an appropriate site to treat the heart failure.

The invention relates to a method and device for reconstructing a 3D image data set of a moving object from a set of projection images, which were recorded at least partially one after the other from different projection directions. The projection images are hereby assigned by ECG gating to a motion phase of the object in each instance and an incomplete 3D image of the object is computed in this motion phase from these few projection images using local tomography. Motion fields are determined from these 3D images and are used during the final 3D image reconstruction for motion corrections.

In some embodiments, the present application discloses systems and methods for cardiac MRI that allow for continuous un-interrupted acquisition without any ECG / cardiac gating or synchronization that achieves the required image contrast for imaging perfusion defects. The invention also teaches an accelerated image reconstruction technique that is tailored to the data acquisition scheme and minimizes or eliminates dark-rim image artifacts. The invention further enables concurrent imaging of perfusion and myocardial wall motion (cardiac function), which can eliminate the need for separate assessment of cardiac function (hence shortening exam time), and / or provide complementary diagnostic information in CAD patients.

A method and apparatus are provided for determining and tracking location of a metallic object in a living body, and then directing a second modality such as ultrasound waves to the determined location. The metal detector may be a radar detector adapted to operate on a living body. The adaption may include disposing a transfer material having electromagnetic properties similar to the body between the radar detector and the living body, ECG gating the radar detector, and / or employing an optimal estimator with a model of expected stent movement in a living body. Applications include determination of extent of in-stent restenosis, performing therapeutic thrombolysis, or determining operational features of a metallic implant.

ECG and ultrasound data of the heart are acquired in real-time during a scan. A data acquisition module is controlled during the scan to prospectively gate acquisition of CT data as a function of the real-time ECG data and the real-time ultrasound data. An image is reconstructed from the acquired CT data.

ECG and ultrasound data of the heart are received in real-time during a scan. CT projection data is also acquired and an image is reconstructed based on the CT projection data, ECG data, and ultrasound data.

The invention discloses a vascular four-dimensional reconstruction method in a NOT gate-controlled ICUS (intravascular ultrasound) image sequence. The method comprises the following steps: accurately positioning an ultrasonic catheter retracement path by utilizing a pair of approximate orthorhombic CAG (chronic atrophic gastritis) image sequences collected with an ICUS image synchronously; carrying out four-dimensional reconstruction on a morphological structure of a target vessel section containing possibly existing plaques through combining the cross section information of a vessel lomen extracted from the ICUS image; and reproducing true forms of coronary vessels at each time phase in a cardiac cycle. With the adoption of the vascular four-dimensional reconstruction method in the NOT gate-controlled ICUS image sequence, the four-dimensional reconstruction of the morphological structure of a coronary artery target vessel section containing the possibly existing plaques is realized, the true forms of the target vessel section at different time phases in the cardiac cycle can be comprehensively and truly reflected; and more reliable accordance can be provided for clinical diagnosis and treatment of coronary arteriesarteriosclerosis osteolytic lesions and research of biomechanical characteristics of coronary artery vascular tissues and the like. The method does not need an ECG-gating acquisition device, and also does not need ECG signals, so that the interventional examination time is greatly shortened, and the requirements on the original image data are reduced.

The present invention includes a method and apparatus to perform rapid multi-slice MR imaging without ECG gating or requiring breath-holding that is capable of renal profusion analysis and angiographic screening. An ungated interleaved pulse sequence is applied in rapid succession, followed by a delay interval. The ungated interleaved pulse sequence is repeatedly played out with the predefined delay interval between each application of the pulse sequence. The resulting images provide not only a series of temporal phases of contrast-enhanced blood uptake for renal profusion analysis, but also provide enough dynamic range to include angiographic screening of the renal arteries.

ECG and ultrasound data of the heart are acquired in real-time during a scan. A data acquisition module is controlled during the scan to prospectively gate acquisition of CT data as a function of the real-time ECG data and the real-time ultrasound data. An image is reconstructed from the acquired CT data.

A C-arm X-ray system includes synchronized ECG gating for enhanced cardiac soft-tissue imaging. The system includes an X-ray source disposed on a C-arm for rotation in a circular path about a patient and configured to release X-ray radiation synchronously with an ECG-gating signal, an X-ray image sensor disposed on the C-arm in a fixed opposing position to the X-ray source and configured to rotate with the source and receive the X-ray radiation and an ECG unit for acquiring ECG data from the patient. The system also includes a digital image acquisition processor arranged in communication with the X-ray source, X-ray image sensor and ECG unit for acquiring 2D projection images at predetermined C-arm angulations in the presence of the ECG-gating signal and an image processor arranged in communication with the digital image acquisition processor to receive and process the series of 2D projection images and reconstruct a continuous 3D volumetric image of the patient's cardiac soft tissue therefrom. A user interface to allow user control of the C-arm system and to display the continuous 3D volumetric image.

A method for three-dimensional visualization of a moving structure by a rotation angiography method is described. A series of projection images is recorded by an image acquisition unit from different recording angles during a rotation cycle. A three-dimensional image data can be reconstructed from the projection images. A continuous rotation cycle is proposed to be performed with simultaneous recording of at least one ECG. A three-dimensional reconstructed reference image is generated through a first correction of the motion of the moving structure by affine transformations. A three-dimensional image data of the moving structure is reconstructed from the data acquired in the continuous rotation cycle when using the reconstructed reference image while performing an estimation and correction of the motion by elastic deformations.

The invention discloses a respiratory and ECG gating device used in a MRI system, relating to the MRI technology, wherein an information processing system is an embedded system taking a singlechip as the processing core; a sensor is used to capture respiratory and electrocardio signals which are amplified and subject to analog-to-digital conversion and input into the singlechip to be processed, and used as well to input the respiratory and electrocadio signals into a computer through a serial port for displaying the essential information on the screen of the computer which returns the information of the threshold preset in a man-computer interaction way to the device through the serial pore; the singlechip operates the threshold signal, i.e., control pulses, according to the generation sequence of the threshold and transmit the threshold signal to an alpha spectrometer. The device of the invention is simple, flexible, reliable and low in cost, and ensures the real timing and accuracy of the captured signals and clear image of the MRI system.

A magnetic resonance imaging apparatus collects raw data about a subject in a synchronized manner with an electrocardiographic signal of the subject. An Electrocardiogram (ECG) gating unit detects an irregular synchronization interval with respect to the electrocardiographic signal. When the ECG gating unit detects an irregular synchronization interval, a real-time sequencer controls a gradient magnetic-field power source, a transmitting unit, and the like so as to reacquire raw data that is acquired during the irregular synchronization interval.

The invention relates to a multifunctional acquisition module for an NMRI system. The multifunctional acquisition module can improve NMRI quality, monitor magnet temperature in real time and stabilize system working frequency. The multifunctional acquisition module integrates functions, such as respiration / ECG-gating, magnet temperature acquisition and automatic tuning, required by the NMRI system to a micro-processing system composed of an analog micro-controller and a CPLD, is integrated to the interior of a spectrometer of the NMRI system through a backplane bus and is in network communication with a computer through the spectrometer. Compared with an existing discrete device for achieving the functions, the multifunctional acquisition module greatly improves the integration level of the system, so that hardware resources are saved, maintenance and operation are facilitated, software and hardware are convenient to update, and meanwhile the multifunctional acquisition module can be conveniently in communication with the upper computer.

A C-arm X-ray system includes synchronized ECG gating for enhanced cardiac soft-tissue imaging. The system includes an X-ray source disposed on a C-arm for rotation in a circular path about a patient and configured to release X-ray radiation synchronously with an ECG-gating signal, an X-ray image sensor disposed on the C-arm in a fixed opposing position to the X-ray source and configured to rotate with the source and receive the X-ray radiation and an ECG unit for acquiring ECG data from the patient. The system also includes a digital image acquisition processor arranged in communication with the X-ray source, X-ray image sensor and ECG unit for acquiring 2D projection images at predetermined C-arm angulations in the presence of the ECG-gating signal and an image processor arranged in communication with the digital image acquisition processor to receive and process the series of 2D projection images and reconstruct a continuous 3D volumetric image of the patient's cardiac soft tissue therefrom. A user interface to allow user control of the C-arm system and to display the continuous 3D volumetric image.

A magnetic resonance imaging apparatus collects raw data about a subject in a synchronized manner with an electrocardiographic signal of the subject. An Electrocardiogram (ECG) gating unit detects an irregular synchronization interval with respect to the electrocardiographic signal. When the ECG gating unit detects an irregular synchronization interval, a real-time sequencer controls a gradient magnetic-field power source, a transmitting unit, and the like so as to reacquire raw data that is acquired during the irregular synchronization interval.

The invention provides a retrospective off-respirator respiration gating method of a cardiac image sequence. According to the method, firstly the Laplacian eigenmap in a manifold learning method is used to carry out dimensionality reduction processing on a matrix with the storage of ECG gating cardiac image sequence data to obtain a low-dimensional coordinate matrix embed in a high-dimensional observation data point set, then the Euclidean distance between adjacent feature vectors in the low-dimensional coordinate matrix is calculated, the local maxima of the Euclidean distance is detected and is used as the selection position of a gated frame, and thus a gating image sequence with the removal of respiration motion artifact is obtained. According to the method, the matrix formed by the gray values of all pixels in an image is directly analyzed, and the respiration motion information in the cardiac image sequence is obtained. According to the method, only the solution of the feature value of a sparse matrix is needed, the manual involvement of an operator is not needed, and the method has the advantages of low computational complexity, high degree of automation, and low application cost. Furthermore, only local distance information is used in the method, and a gating result is not sensitive to noise.

A method for three-dimensional visualization of a moving structure by a rotation angiography method is described. A series of projection images is recorded by an image acquisition unit from different recording angles during a rotation cycle. A three-dimensional image data can be reconstructed from the projection images. A continuous rotation cycle is proposed to be performed with simultaneous recording of at least one ECG. A three-dimensional reconstructed reference image is generated through a first correction of the motion of the moving structure by affine transformations. A three-dimensional image data of the moving structure is reconstructed from the data acquired in the continuous rotation cycle when using the reconstructed reference image while performing an estimation and correction of the motion by elastic deformations.

The invention discloses a high-voltage and high-frequency pulsed electric field ablatograph based on a double-gating technology, which comprises a high-frequency and high-voltage pulsed electric field generator, the generator is used for generating a default command pulse; a two-way electrocardio gating module has independent or combined gating functions of body surface electrocardiograms and intracavity bipolar ventricular electrograms and is used for personalized dynamic detection of safe treatment time windows; an electrode array and polarity adapting module which is used for adapting and distributing the multi-pole electrode conduit and the electrode array conduit; a physical and biological safety detection and monitoring module which is used for automatically detecting and continuously monitoring physical, biological and program-controlled safety parameters of the ablation instrument; a multifunctional switch which is used for controlling the two-way electrocardio gating module and the high-frequency and high-voltage pulse electric field generator; an interference protection module which is used for stabilizing interference signals; a main control screen; and a high-voltage-resistant optoelectronic isolation power supply. According to the invention, the operation efficiency can be improved, damage to heart cells except target cells is avoided, and tissue stimulation and muscular pain are reduced.

The invention provides a magnetic resonance imaging apparatus capable of displacing an imaging range for each of the imaging scans based on the detected displacement of the diaphragm. A control unit controls an RF coil reception / transmission unit and a gradient field power supply to generate a series of slice images by repeatedly imaging a region including the heart by ECG gating for preliminary scans for the probe scans and the imaging scans. This apparatus specifies, for the series of slice images, the first rest period in which a variation in position of the coronary artery falls within a predetermined range in a cardiac cycle, based. on a change in the image of the overall heart. The apparatus specifies the second rest period of the coronary artery in the cardiac cycle, for a plurality of slice images, of the series of slice images, which correspond to the specified first rest period or a rest period enlarged from the first rest period, by tracking the movement of the coronary artery only within a local range including the coronary artery. The apparatus then reconstructs an image based on MR data acquired in the second rest period.

In some embodiments, the present application discloses systems and methods for cardiac MRI that allow for continuous un-interrupted acquisition without any ECG / cardiac gating or synchronization that achieves the required image contrast for imaging perfusion defects. The invention also teaches an accelerated image reconstruction technique that is tailored to the data acquisition scheme and minimizes or eliminates dark-rim image artifacts. The invention further enables concurrent imaging of perfusion and myocardial wall motion (cardiac function), which can eliminate the need for separate assessment of cardiac function (hence shortening exam time), and / or provide complementary diagnostic information in CAD patients.

Provided are one or more systems and / or techniques for mitigating motion artifacts in a computed tomography image of an anatomical object. Extended scan data is received and includes projections and backprojections acquired for parallel rays emitted by a radiation source at different angular locations within a first range of source angles. The projections and the backprojections are compared to identify differences between the projections and the backprojections at the different angular locations. Movement of the anatomical object during acquisition of the extended scan data at the different angular locations is quantified, and short scan data is identified. The short set includes a subset of the extended scan data acquired at different locations within a second range of source angles where the quantified movement of the anatomical object is less than a movement threshold. The computed tomography image of the anatomical object is reconstructed from the short scan data.

The invention provides a myocardial quantitative magnetic resonance imaging method, equipment and storage medium. The method includes: performing an image signal acquisition operation under the control of the ECG gating signal and the respiratory navigation signal at intervals of the recovery period; determining the parameter T according to the acquired image signal and the delay time of the corresponding saturation pulse 1 ;according to the parameter T 1 Generate myocardial quantitative magnetic resonance images. This protocol allows the scan to be completed with the subject breathing freely, without the need for breath-holding. At the same time, it also allows to further expand the imaging field of view and improve the spatial resolution. In addition, segmented acquisitions are fully interleaved between sampling points via k‑space, enabling intrinsic registration of the original image without additional image processing in post.

The invention relates to a wearable device and a wearable-device-based magnetic resonance electrocardiogramgate control system.The wearable device comprises a PPG (photoplethysmograph) signal acquisition unit, an R-wave pulse building unit of an electrocardiogram signal and a communication unit; the PPG signal acquisition unit collects a PPG signal of a tester, and sends the PPG signal to the R-wave pulse building unit of the electrocardiogram signal; after the PPG signal is subjected to time delay by the R-wave pulse building unit of the electrocardiogram signal according to the set time delay duration, an R-wave pulse of the electrocardiogram signal is generated; and the communication unit transmits the R-wave pulse of the electrocardiogram signal to a host computer of the corresponding magnetic resonance electrocardiogram gate control system. The R-wave pulse of the ECG (Electrocardiogram) signal is obtained afterthe PPG signal, collected by the wearable device, of thetester is subjected to time delay. The wearable device is simple in structure, low in price and easy to operate, and the tester does not need to maintain the state of attachingelectrodes on chest during the detection process.

In a diagnostic imaging system (10), a monitor (50) monitors periodic biological cycles of the subject (14). A trigger point detector (60) detects a time (tl, t2, ..., tn) of a common, reoccurring reference point (Rl, R2, ..., Rn) in each periodic cycle of the subject (14). A sequence selector (62) selects a sequence (64) of nominal sampling segments (Si, S2, ..., Sn). An adjustor (70) adjusts duration of each nominal sampling segment (Si, S2, ..., Sn) to coincide with the times of detected reference points (Rl, R2, ..., Rn). A scaling processor (72) scales each adjusted segment based on a difference in duration between the corresponding nominal (Si, S2, ..., Sn) and adjusted sampling segments (S'i, S'2, ..., S'n).

The present invention provides a 3D vascular imaging algorithm based on the reverse principal component analysis method, which relates to the technical field of medical vascular imaging. Firstly, the ECG gating method is used to collect ECG signals, and the gating signals are output according to the ECG signals and transmitted to A spectrometer that generates and registers structural image data. Secondly, the complex signal statistical model was constructed, and the vascular red blood cell reflection signal in the complex signal statistical model was extracted by reverse principal component analysis, and the blood flow image was generated. Finally, the independent component analysis model is used to obtain the independent element axis of the contour point cluster of the blood flow image, and the translation and rotation of the independent element axis are calculated by using the differential search algorithm, and then the blood flow image is registered. The technical solution improves the signal-to-noise ratio of three-dimensional vascular imaging, reduces the messy background information generated by the reflection of biological tissue, improves the quality of imaging images, and alleviates the technical problems of low quality and serious noise of vascular imaging in the prior art.

The invention belongs to the technical field of image processing and discloses a mouse cardiac imaging system and method based on prospective ECG (electrocardiogram) gating. The system comprises: an ECG signal acquisition front end for acquiring mouse real-time heartbeat information during CT (computed tomography) image acquisition; a control board that acquires mouse ECG information to generate a triggering level and trigger an X-ray detector so as to finish mouse projection image acquisition; a Micro-CT acquisition system for reconstructing 360 pieces of projection data. Motion phase of mouse heart is judged by capturing ECG information of a live mouse and extracting R-wave peaks of the mouse ECG signals; the X-ray detector is triggered by the R-wave peaks to perform projection data sequence acquisition on the mouse heart via the Micro-CT imaging technology, multiple phase images of the mouse at each angle within the whole cardiac motion period are acquired, and the reconstructed multiple phase images of the mouse heart within the whole heartbeat period are restored.