19 results about "Blood pool" patented technology

The invention relates to the technical field of medical image processing and three-dimensional reconstruction, and particularly discloses a reconstruction and analogue simulation method based on a cardiac image. The method comprises the following steps: firstly, preprocessing an input CT or MRI medical image, and automatically segmenting a heart multi-tissue structure by using an nnUNetv2 model, including a plurality of anatomical regions such as atrium, ventricle, myocardial tissue and blood pool; and then performing topology repair, smoothing processing and label resampling on the segmentation result to obtain a three-dimensional label body with a continuous structure and a complete boundary. And based on the optimized tag body, constructing a heart three-dimensional surface model by adopting a Marching Cubes algorithm, and generating a multi-material volume grid suitable for finite element analysis. According to an electrode position and a radio frequency parameter set by a user, a radio frequency ablation simulation model based on a Pennes biological heat conduction equation and an Arrhenius model is established, a temperature field and a tissue thermal damage range are calculated, and a simulation result is displayed in a three-dimensional mode in an overlapping mode. According to the method, the integrated process from medical image automatic segmentation to heart three-dimensional reconstruction and thermal simulation is realized, the segmentation precision, the modeling efficiency and the simulation reliability are improved, and the method can be applied to application scenes such as surgical planning, preoperative evaluation and medical teaching.

A method includes monitoring impedances of the plurality of the functional electrodes relative to a reference electrode while maneuvering a catheter within a cavity of an organ, the catheter comprising (i) a shaft having a distal end, and (ii) an expandable distal-end assembly coupled to the distal end of the shaft and comprising a plurality of functional electrodes. A direction vector is estimated from the monitored impedances, along which the catheter is free to advance within the cavity of the organ without obstruction by the tissue wall. The direction vector is displayed to a user.

Assessment of transthyretin amyloid cardiomyopathy (ATTR-CM) can be performed by calculating a cardiac pyrophosphate activity (CPA) measurement from single-photon emission computed tomography (SPECT) images. SPECT images obtained using 99mTechnetium-pyrophosphate as a radiotracer can be analyzed to calculate CPA. Scan-specific thresholds for abnormal myocardial activity are identified based on left ventricular blood pool (LVBP) radiotracer counts, then radiotracer activity in regions of the myocardium with abnormal myocardial activity is determined. Finally, a CPA measurement can be calculated as a function of the mean radiotracer counts in such regions over the maximal LVBP radiotracer activity multiplied by the volume of involvement (e.g., the volume of abnormal activity). This CPA measurement can then be used as an assessment of ATTR-CM.

This invention relates to the field of medical device technology and proposes an inflatable medical protective restraint belt, comprising a belt body, a distal airbag, a mid-section airbag, a proximal airbag, a gas distribution valve assembly, a micro air pump, and a micro geared motor. By sequentially arranging the distal, mid-section, and proximal airbags along the longitudinal direction of the limb within the belt body, and utilizing three circumferentially different air distribution channels with varying lengths and phases on a rotating gas distribution valve core, the three airbags inflate and deflate sequentially from distal to proximal as the valve core rotates continuously. This solves the technical problem of existing restraint belts causing obstruction of venous return and swelling due to blood pooling at the distal end of the limb caused by constant pressure. It achieves the technical effect of periodically applying pulsating pressure from distal to proximal to the limb during restraint, promoting venous blood return to the proximal end, and resolving the problems of reliance on nursing manpower and the potential for safety gaps in existing technologies.

A method for evaluating placement of a prosthetic device. The method comprises designating a position in a depiction of an anatomical region that includes a first structure in which the device is to be placed, the depiction showing the first structure and / or a blood pool volume of a second structure, and wherein the designated position corresponds to a position in the first structure at which the device may be placed. The method further comprises defining a plane and offsetting a representation thereof to a point in the depiction(s) at which the device would intersect the blood pool volume if placed at the designated position. The method comprises manipulating the orientation and / or position of the offset representation and determining a cross-sectional area of the blood pool volume along the manipulated representation for evaluating obstruction through the second structure if the device was placed at a corresponding position in the first structure.

An electroanatomical mapping system generates a cardiac mechanical signal from a plurality of cardiac images and, more particularly, a plurality of ultrasound images. For each image, the system segments a blood pool / tissue border to detect a blob and defines a size metric, such as volume, area, maximum axial dimension, Zernike Moment, or the like for the detected blob. The plurality of size metrics thus generated can be output as a function of time to generate the cardiac mechanical signal. Local minima in the signal correspond to systole, while local maxima in the signal correspond to diastole.

An electroanatomical mapping system models an anatomical (e.g., endocardial) surface bounding an anatomical volume (e.g., a heart chamber). The system receives a three-dimensional ultrasound image containing the volume, segments a blood pool / tissue boundary of the volume in the image, and outputs the segmented boundary as a model of the anatomical surface. In embodiments, segmentation includes solving a level set-based partial differential equation in three dimensions to iteratively expand from an initial boundary to a final boundary. In particular, an additive operator scheme, or other semi-implicit scheme, can be used to solve the partial differential equation, advantageously with all dimensions being solved in parallel.

An electroanatomical mapping system models an anatomical (e.g., endocardial) surface bounding an anatomical volume (e.g., a heart chamber). The system receives a three-dimensional ultrasound image containing the volume, segments a blood pool / tissue boundary of the volume in the image, and outputs the segmented boundary as a model of the anatomical surface. In embodiments, segmentation includes solving a level set-based partial differential equation in three dimensions to iteratively expand from an initial boundary to a final boundary. In particular, an additive operator scheme, or other semi-implicit scheme, can be used to solve the partial differential equation, advantageously with all dimensions being solved in parallel.

A method for equilibrium phase contrast-enhanced magnetic resonance (MR) angiography using an extracellular MR contrast agent administered to a subject includes performing a balanced T1 relaxation enhanced steady-state (bT1RESS) pulse sequence to acquire MR data from a region of interest of the subject during an equilibrium phase of contrast enhancement after a first pass of the extracellular contrast agent through the region of interest. The bT1RESS pulse sequence includes a T1-weighted magnetization preparation including at least one contrast modifying (CM) radio frequency (RF) pulse, a single-shot balanced steady-state free precession (bSSFP) readout, and a time interval between the T1-weighted magnetization preparation and the acquisition of a center of k-space. The time interval is determined based on a T1 relaxation time of a contrast-enhanced blood pool and a flip angle of the at least one CM RF pulse. The method further includes generating an angiographic image of the region of interest.

A computer-implemented method comprises: receiving a measurement data set, the measurement data set including energy resolved data based on a computed tomography scan of the patient; reconstructing a morphology preserving image data set based on a first photon-energy band or a first combination of photon-energy bands described by the measurement data set; segmenting a blood pool within a myocardium in the morphology preserving image data set; reconstructing a contrast agent map based on a second photon-energy band or a second combination of photon-energy bands described by the measurement data set; determining a reference value based on at least one pixel or voxel of the contrast agent map within the segmented blood pool; and determining a respective myocardial extracellular volume fraction depending on the reference value and a value given for at least one respective pixel or voxel outside the segmented blood pool by the contrast agent map.

This invention relates to the fields of computer vision and medical image processing technology, and discloses a method for extracting lesion structures from cardiac magnetic resonance imaging (MRI) images based on deep learning. The method first retrieves dynamic cardiac cine sequences and delayed gadolinium-enhanced sequences from the same anatomical location, extracts the centroid trajectory of the left ventricular blood pool, and performs cross-sequence axial alignment and non-rigid deformation correction. Subsequently, a local orthogonal coordinate system based on the myocardial anatomical topology is constructed, and pixel-level motion vector fields with physical constraints are calculated in the dynamic cardiac cine sequences. By projecting the motion vectors onto the local orthogonal coordinate system and performing vector clipping according to the centripetal contraction physical constraint, an effective motion vector field is generated. Finally, dynamic features and image grayscale features are fused, and a logic gating operator is used to extract the lesion structure mask.

The invention discloses a cardiac blood pool super overflow correction method and device for myocardial blood flow quantification. The cardiac blood pool super overflow correction method comprises the following steps: generating a myocardial time activity curve, a left ventricle average myocardial time activity curve and a cardiac blood pool time activity curve according to a dynamic bull's-eye map; dividing a heart blood pool super overflow area based on the myocardial time activity curve, and correcting the myocardial time activity curve in the heart blood pool super overflow area. According to the method, the myocardial part influenced by the super overflow effect of the heart blood pool can be effectively judged through decomposition and analysis of the myocardial time curve characteristics. Meanwhile, before dynamic modeling, the heart blood pool super overflow effect of the part is corrected, so that the nonlinear fitting degree of a myocardial time activity curve and a chamber model is improved in the dynamic calculation process, and the correctness and distribution reasonability of dynamic parameters generated in the nonlinear fitting process are ensured; therefore, the accuracy of myocardial blood flow quantification is improved.

An electroanatomical mapping system generates a cardiac mechanical signal from a plurality of cardiac images and, more particularly, a plurality of ultrasound images. For each image, the system segments a blood pool / tissue border to detect a blob and defines a size metric, such as volume, area, maximum axial dimension, Zernike Moment, or the like for the detected blob. The plurality of size metrics thus generated can be output as a function of time to generate the cardiac mechanical signal. Local minima in the signal correspond to systole, while local maxima in the signal correspond to diastole.

The embodiment of the invention provides a data processing method and device, and belongs to the technical field of tomography. The method comprises the following steps: acquiring a CT image of a chest and SPECT image domain body data; segmenting the CT image to obtain a myocardial mask; the myocardial mask comprises three-dimensional anatomical contour information of the myocardial; registering the CT image domain body data and the SPECT image domain body data to obtain target SPECT image domain body data; determining a myocardial region and a blood pool region according to the myocardial mask and the target SPECT image domain body data; and the myocardial blood flow corresponding to the myocardial area and the blood pool area is determined, so that the determination precision of the myocardial blood flow is improved.

The utility model relates to the field of livestock bloodletting assembly lines, in particular to a livestock bloodletting assembly line blood baffle which comprises a blood pool and two baffles, a mounting frame is fixedly connected to the outer surface of the blood pool, mounting blocks arranged at equal intervals are fixedly connected to the inner wall of the mounting frame, and a sliding groove is formed in the upper surface of each mounting block; a mounting frame is arranged on the surface of a blood pool, a mounting block is mounted on the inner wall of the mounting frame, a sliding groove is formed, a sliding frame and the sliding block are limited and locked through a bolt piece, a mounting rod is arranged between the sliding frame and a baffle for connection, and then mounting of the baffle is achieved; through installation of the guide plate, pigs can be automatically guided to the position between the two baffles when being conveyed, limiting of the pigs is achieved, shaking of the pigs during bloodletting is prevented, pig blood can be prevented from being splashed through the baffles, and influences on collection of the pig blood are prevented.

An inductive sensing system (8) for detecting bleeding (e.g. blood pools) in one or more regions of a body. The system comprises a resonator circuit (10) having at least one antenna (12) driven with an oscillating drive signal to cause generation of an electromagnetic signal for application to the body. The signal induces eddy currents within the body which generate a secondary EM signal returned from the body. These interact with the resonator circuit by adding an additional inductance component to the circuit. This inductance component varies depending on the conductivity of the fluid in which the eddy currents are induced. Blood has a different conductivity to other bodily fluids. The system is configured to detect the presence of abnormal accumulations of blood based on the additional inductance component. The system generates a data output representative of the determination.

The utility model relates to the field of blood receiving pools, in particular to a livestock white strip line blood receiving pool structure which comprises a fixed base and a blood receiving pool body, the inner wall of the blood receiving pool body is a smooth curved surface, a first motor is fixedly installed on the outer surface of the blood receiving pool body, the output end of the first motor is fixedly connected with a connecting rod, and by starting the first motor, the blood receiving pool body is connected with the connecting rod. The first motor drives the connecting rod to rotate in the blood receiving pool body, the connecting rod rotates to drive the stirring wheel to fully stir pig blood in the blood receiving pool body to prevent caking, the blood can be easily flushed in the later period through the smooth curved surface design of the blood receiving pool body, bacteria breeding at dead corners is reduced, and then the second motor is started to drive the blood receiving pool body to rotate. And the screw rotates to drive the scraper to clean the blood receiving pool body, so that the effects that the pig blood can be kept in a flowing state through the arrangement of the blood receiving pool body and the stirring wheel, and bacterial hyperplasia caused by the fact that the blood is coagulated and difficult to clean is prevented are achieved.

The application discloses a sample analyzer, which comprises a rack, a routine blood test measuring assembly, an air pump assembly (57), an air tank assembly (27) and an optical assembly (26); the rack comprises a rack front plate (201), a rack back plate (204) and a rack middle partition plate (205), the air pump assembly (57) is arranged on the left upper side of the rack middle partition plate (205), and the routine blood test measuring assembly, the optical assembly (26) and the air tank assembly (27) are arranged in the right cavity; the routine blood test measuring assembly comprises a RET reaction pool assembly (30) and a WBC reaction pool assembly (31), the routine blood pool position of the RET reaction pool assembly (30) comprises an RET pool position (11), the routine blood pool position of the WBC reaction pool assembly (31) comprises a WNB pool position (9) and a DIFF pool position (10); the air tank assembly (27) and the optical assembly (26) are arranged in sequence along the front-rear direction of the sample analyzer.

This invention belongs to the field of nuclear medicine and relates to a carbonic anhydrase IX targeting compound and its application. The carbonic anhydrase IX targeting compound has the structure shown in Formula I. ¹ This invention provides… 8 F-labeled CAIX-targeting molecular probes all achieved high-contrast imaging of CAIX-positive tumors in vivo. Each compound exhibited excellent tumor-to-kidney ratio, tumor-to-sarcoma ratio, tumor-to-liver ratio, and tumor-to-blood-pool ratio, demonstrating significant advantages in improving imaging clarity and reducing non-specific interference. These compounds are highly promising tumor PET imaging agents for CAIX targeting. In summary, 18 In addition to its excellent target / non-target ratio, F-T2 significantly reduces non-specific uptake in the stomach, making it more suitable for imaging CAIX-expressing lesions in abdominal organs and more conducive to the detection of small abdominal lesions.