88 results about "Cardiac motion" patented technology

Methods for evaluating motion of a cardiac tissue location, e.g., heart wall, are provided. In the subject methods, timing of a signal obtain from a strain gauge stably associated with the tissue location of interest is employed to evaluate movement of the cardiac tissue location. Also provided are systems, devices and related compositions for practicing the subject methods. The subject methods and devices find use in a variety of different applications, including cardiac resynchronization therapy.

The present invention relates to a method of measuring motion of an object such as a heart by magnetic resonance imaging. A pulse sequence is applied to spatially modulate a region of interest of the object and at least one first spectral peak is acquired from the Fourier domain of the spatially modulated object. The inverse Fourier transform information of the acquired first spectral-peaks is computed and a computed first harmonic phase image is determined from each spectral peak. The process is repeated to create a second harmonic phase image from each second spectral peak and the strain is determined from the first and second harmonic phase images. In a preferred embodiment, the method is employed to determine strain within the myocardium and to determine change in position of a point at two different times which may result in an increased distance or reduced distance. The method may be employed to determine the path of motion of a point through a sequence of tag images depicting movement of the heart. The method may be employed to determine circumferential strain and radial strain.

A method and an apparatus for acquiring 3-dimensional images of coronary vessels (11), particularly of coronary veins, is proposed. 2-dimensional X-ray images (13) are acquired within a same phase of a cardiac motion. Then, a 3-dimensional centerline model (15) is generated based on these 2-dimensional images. From 2-dimensional projections of the centerline model into respective projection planes, the local diameters (w) of the vessels in the projection plane can be derived. Having the diameters, a 3-dimensional hull model of the vessel system can be generated and, optionally, 4-dimensional information about the vessel movement can be derived.

Devices for stabilizing tissue during a surgical procedure. The beating heart may be stabilized during a surgical procedure on the heart, using a described stabilizing device. In one example, a stabilizing device is introduced through an opening in the chest and brought into contact with the beating heart. By contacting the heart with the device and by exerting a stabilizing force on the device, the motion of the heart caused by the contraction of the heart muscles id effectively eliminated such that the heart is stabilized and the site of the surgery moves only minimally if at all.

A method for non-rigid registration and fusion of images with physiological modeled organ motions resulting from respiratory motion and cardiac motion that are mathematically modeled with physiological constraints. A method of combining images comprises the steps of obtaining a first image dataset (24) of a region of interest of a subject and obtaining a second image dataset (34) of the region of interest of the subject. Next, a general model of physiological motion for the region of interest is provided (142). The general model of physiological motion is adapted with data derived from the first image data set (140) to provide a subject specific physiological model (154). The subject specific physiological model is applied (172) to the second image dataset (150) to provide a combined image (122).

A method and system are provided to measure cardiac motion data using a cardiovascular navigation system. The method and system position a patient reference sensor (PRS) on a patient, wherein the PRS determines a position of the patient relative to a reference point. The method and system determine a reference orientation matrix based on an orientation of the PRS relative to a reference point and determining a normalization time based on an electrical signal. The method and system obtain point specific (PS) motion data for a plurality of map points. The PS motion data indicates a three dimensional trajectory that occurs at the corresponding map point on a wall of a heart of the patient during at least one cardiac cycle. Further the method and system compensate the PS motion data based on the PRS.

Navigator methods are disclosed that are based on detecting a flow-sensitive signal within a subject, and using the position of the signal to track subject motion between imaging sequences. In a disclosed embodiment, the fast-moving blood volume in the left ventricle of the heart is detected and used as a reference point to correct for cardiac motion that results from respiratory motion in a subject. The navigator based on the position of the fast-moving blood volume in the left ventricle may be applied prospectively to shift a subsequent imaging slice to compensate for subject motion, and thereby provide MRI images with increased clarity and resolution.

A method and apparatus are provided for obtaining and processing ballistocardiograph data to determine a physiological condition of a subject. Ballistocardiograph data indicative of heart motion of the subject measured along a plurality of spatial axes by a sensor device which may comprise a three-axis accelerometer. The ballistocardiograph data is processed to determine processed data indicative of heart motion of the subject. Indications of physiological condition are determined based at least in part on the processed data. Processing may comprise aggregation of multidimensional data, determining magnitude of heart motion and derivative thereof, determining a thrust summation, determining an index value, outputting a report based on an index value, etc. Processing may be informed by operator input, such as a time window of interest or indications of interest.

Cardiac computed tomography (CT) has been a hot topic for years because of the clinical importance of cardiac diseases and the rapid evolution of CT systems. In this application, we disclose a novel strategy for controlled cardiac CT (CCCT) that may effectively reduce image artifacts due to cardiac and respiratory motions and reduce the scan time. Our approach is radically different from existing ones and is based on controlling the x-ray source rotation velocity and powering status in reference to the cardiac motion. By such a control-based intervention the data acquisition process can be optimized for cardiac CT in the cases of periodic and quasi-periodic cardiac motions. Specifically, we present the corresponding coordination / control schemes for either exact or approximate matches between the ideal and actual source positions.

The invention provides a non-invasive system and method for treatment of the heart. In a first aspect, a method for treatment of an anatomical site related to arrhythmogenesis of a heart of a patient comprises creating a target shape encompassing the anatomical site, directing particle beam radiation or x-ray radiation from outside the patient toward the target shape wherein one or more doses of radiation ablates the target shape and disregarding at least one orientation of cardiac motion while creating the target shape or directing the particle beam or both.

A method for acquiring the motion information of coronary artery, which belongs to the field of medical detection technology, is used for solving the problem in acquiring the motion information of heart. The technical scheme is that a 3D motion estimation method based on elastic registration is adopted after achieving 3D reconstruction of branch skeleton of main blood vessels at each moment in X-ray coronary artery angiogram sequences; the motion of blood skeleton is transformed to be matched with skeleton lines at continuous time moments; the motion vector and the motion trajectory of each blood skeleton point in cardiac cycle are calculated; and the motion information including global and the local motion parameters of the coronary artery in the cardiac cycle is extracted according to the estimated motion vector of each blood skeleton in the image sequence. The method has the advantages of high accuracy in extracting the motion information of blood vessels, convenient operation and high work efficiency.

The invention discloses a magnetic resonance imaging method. The magnetic resonance imaging method comprises the steps of monitoring the respiratory movement of a subject through a respiratory navigation sequence, monitoring the cardiac motion of the subject through an electrocardio navigation sequence, and judging whether the physiological state meets the preset scanning condition or not, wherein the scanning condition is that the respiratory movement enters the expiratory end period and the cardiac motion enters the diastole; if the physiological state meets the scanning condition, motivating an imaging sequence in a to-be-imaged region, and acquiring the magnetic resonance imaging data; if the physiological state does not meet the scanning condition, continuing to monitor the physiological state of the subject till the physiological state meets the scanning condition; and after the imaging data is acquired, carrying out reestablishment to obtain a magnetic resonance image. According to the magnetic resonance imaging method, the physiological state of a human body is monitored through the respiratory navigation sequence and the electrocardio navigation sequence alternately, a magnetic resonance signal is acquired at a common interval of the expiratory end period and the diastole, and respiratory movement and cardiac motion artifacts can be effectively avoided. Besides, the invention further provides a magnetic resonance imaging system.

A method for improving the treatment and / or examination of vessel walls through fluid, such as blood, functions by identifying the points in time when the catheter is closest to the vessel wall or farthest from the vessel wall. Identification of this relative location enables improved spectral readings in larger vessels. In short, instead of trying to overcome motion (e.g., by centering the catheter), this approach takes advantage of motion by identify times when the catheter is closer to the vessel wall, in order to gather more useful spectral information or improve the efficacy of the treatment of the vessel walls. In the specific example, the invention is used for near infrared (NIR) spectroscopy. In some embodiments, the catheter head is designed to induce relative movement between the head and the vessel walls.

Method and systems are disclosed for radiating a moving target inside a heart. The method includes acquiring sequential volumetric representations of an area of the heart and defining a target tissue region and / or a radiation sensitive structure region in 3D for a first of the representations. The target tissue region and / or radiation sensitive structure region are identified for another of the representations by an analysis of the area of the heart from the first representation and the other representation. Radiation beams to the target tissue region are fired in response to the identified target tissue region and / or radiation sensitive structure region from the other representation.

Medical radar devices, including ultra-wideband (UWB) devices, for use in assisting and / or guiding cardiopulmonary resuscitation (CPR) by indicating one or more of: compression depth, compression frequency, and a return to spontaneous circulation. The devices and methods described herein may use reflected energy applied to a patient's chest to determine cardiac motion and / or chest compression and provide feedback to the person applying the CPR. In some variations the device is incorporated as a part of another resuscitation device, such as a defibrillator or automatic compression device.

The invention relates to a respiratory motion determination apparatus for determining respiratory motion of a living being (3). A raw data providing unit (2) provides raw data assigned to different times, wherein the raw data are indicative of a structure like the apex of the heart muscle, which is influenced by cardiac motion and by respiratory motion, and a reconstruction unit (6) reconstructs intermediate images of the structure from the provided raw data. A structure detection unit (7) detects the structure in the reconstructed intermediate images, and a respiratory motion determination unit (10) determines the respiratory motion of the living being based on the structure detected in the reconstructed intermediate images. This allows determining respiratory motion with high accuracy, without relying on, for example, a stable correlation between a tracking signal of an external respiratory gating device and respiratory phases.

A method and system for estimating 3D cardiac motion from a single C-arm angiography scan is disclosed. An initial 3D volume is reconstructed from a plurality of 2D projection images acquired in a single C-arm scan. A static mesh is extracted by segmenting an object in the initial 3D volume. The static mesh is projected to each of the 2D projection images. A cardiac phase is determined for each of the 2D projection images. A deformed mesh is generated for each of a plurality of cardiac phases based on a 2D contour of the object and the projected mesh in each of the 2D projection images of that cardiac phase.

Image and video processing using multi-scale amplitude-modulation frequency-modulation (“AM-FM”) demodulation where a multi-scale filterbank with bandpass filters that correspond to each scale are used to calculate estimates for instantaneous amplitude, instantaneous phase, and instantaneous frequency. The image and video are reconstructed using the instantaneous amplitude and instantaneous frequency estimates and variable-spacing local linear phase and multi-scale least square reconstruction techniques. AM-FM demodulation is applicable in imaging modalities such as electron microscopy, spectral and hyperspectral devices, ultrasound, magnetic resonance imaging (“MRI”), positron emission tomography (“PET”), histology, color and monochrome images, molecular imaging, radiographs (“X-rays”), computer tomography (“CT”), and others. Specific applications include fingerprint identification, detection and diagnosis of retinal disease, malignant cancer tumors, cardiac image segmentation, atherosclerosis characterization, brain function, histopathology specimen classification, characterization of anatomical structure such as carotid artery walls and plaques or cardiac motion and as the basis for computer-aided diagnosis to name a few.

The invention relates to a dynamic three-dimensional reconstruction method of single-arm X-ray angiogram maps, which belongs to the field of the intersection of digital image processing and medical imaging and aims to meet the requirements of the auxiliary detection and surgical navigation of cardiovascular diseases in clinical medicine. The invention provides a concept of 'dynamic vessel three-dimensional reconstruction', so that the angiogram maps of double visual angles at different moments are compensated for respiratory movement and cardiac movement. The dynamic three-dimensional reconstruction method can obtain the high three-dimensional reconstruction accuracy of coronary artery vessels, solve the problem that the automatic and reliable three-dimensional reconstruction is performed by multi-visual angle angiography maps with different time phases, assist in the detection and surgical navigation of the cardiovascular diseases effectively and meet the clinical requirement.

A method for cardiac motion estimation includes: receiving a set of echocardiographic images of a heart, the echocardiographic images including B-mode ultrasonic images and Tissue Doppler Imaging (TDI) images; and calculating, by the image processing machine, a motion field representing the motion of the heart using the B-mode ultrasonic images and applying a velocity constraint from the TDI images. A system for cardiac motion estimation, includes: an imaging device configured to acquire a set of echocardiographic images of a heart, the echocardiographic images including B-mode ultrasonic images and TDI images; a data storage device in communication with the imaging device and configured to store the set of echocardiographic images; an image processing machine in communication with the data storage device and configured to calculate a motion field representing the motion of the heart using the B-mode ultrasonic images and applying a velocity constraint from the TDI images.

Apparatus (18) for performing a medical procedure on a beating heart (20) includes a mechanical stabilization element (25), a surface (27) of which is adapted to be applied to a segment (24) of the heart to reduce motion of the segment. One or more electrodes (100) are fixed to the surface of the stabilization element, so as to contact the segment when the stabilization element is applied to the segment. Preferably, at least one of the one or more electrodes is adapted to apply electrical signals to the segment so as to further reduce motion thereof, while the heart continues to pump blood.

The invention relates to a heart image motion artifact correction method, system and equipment, a readable storage medium, and belongs to the technical field of medical images. Heart scanning data ofa scanning object is obtained in the scanning process, and a heart reconstruction image of the scanning object is obtained according to the heart scanning data; the heart reconstruction image is inputinto a preset deep learning network, and a heart motion artifact correction image output by the deep learning network is obtained; and the analysis learning capability of the deep learning network isused to train the feature transformation of the heart image in order to achieve the capability of heart motion artifact correction, and the end-to-end correction of the whole heart reconstruction image is achieved through the deep learning network, so the correction error is effectively avoided.

A diagnostic imaging apparatus includes a ventricular volume-variation measuring unit that measures sequential variations in a size of a ventricle within at least one heart beat, from images of a heart scanned in each of a plurality of time phases; a scanning-condition setting unit that specifies a time phase of little cardiac motion based on variations in the size of the ventricle measured by the ventricular volume-variation measuring unit, and sets scanning conditions so as to collect data in the specified time phase; and an imaging unit that collects data based on the scanning conditions set by the scanning-condition setting unit, and reconstructs an image from the collected data.