32 results about "Perfusion scanning" patented technology

A compact perfusion scanner and method of characterizing tissue health status are disclosed that incorporate pressure sensing components in conjunction with the optical sensors to monitor the level of applied pressure on target tissue for precise skin/tissue blood perfusion measurements and oximetry. The systems and methods allow perfusion imaging and perfusion mapping (geometric and temporal), signal processing and pattern recognition, noise cancelling and data fusion of perfusion data, scanner position and pressure readings.

Methods and systems are provided for adaptive scan control. In one embodiment, a method comprises, during a scan session, performing a first scan of a heart of a subject using a first scan protocol, performing a second scan of the heart using a second scan protocol, and performing a third scan of the heart using the first scan protocol, and while performing the first scan and the third scan, adjusting a scan rate of the first scan protocol based on a heart rate of the subject. In this way, multiple scan protocols, such as angiography and perfusion scan protocols, can be interleaved within a single scan and the scan protocol may be adapted to a patient.

The invention relates to a method for calculating brain blood volume. The method is used for calculating the brain blood volume on the stable status CT (Computed Tomography) brain perfusion imaging principle. The method comprises the following steps of (1) carrying out common whole brain CT scanning to obtain a brain tissue structure image before contrast agent injection; injecting the contrast agent to the vessel exciting area to reach the stable status, and obtaining the brain tissue structure image of the same position; (3) deleting an overhigh brain blood volume value with a vessel pixel deleting method, and deleting the interference of the artery in the existing area to the brain blood content measuring value; (4) and calculating the brain blood flow value of the brain tissue by calculating the ratio of the brain tissue to the signal change in the vessel according to a formula. With the method, all brain scanning can be carried out and the radial dosage of the perfusion scanning can be reduced, thus the method for calculating brain blood volume can be widely applied into the clinical trial.

The invention discloses a method for measuring the blood flow velocity of a blood vessel. The method comprises the following steps: injecting a quantitative amount of a contrast agent to the originalpoint of blood flow in a target region; scanning the original point of blood flow in the target region with CT to obtain the image of the original point, and starting timing; performing perfusion scanning on the terminal end of the blood flow in the target area with CT to obtain the image of the contrast agent firstly reaching the terminal point, and recording the time t; spirally scanning the target area to realize three-dimensional reconstruction of the blood vessel in the target area; straightening the blood vessel in the target area and measuring the blood vessel length S of the target area by analysis and measurement software for the CT; and calculating the blood flow velocity V of the target area according to the blood vessel length S of the target area and the time t, that is V = S/t. The method for measuring the blood flow velocity of the target area based on a spiral CT imaging system can be used to intuitively and conveniently display data required for calculating the blood flow velocity of the blood vessel, so the accuracy of data is effectively ensured, and the test efficiency is improved.

The invention belongs to the technical field of perfusion and energy spectrum combined scanning, and discloses an image processing method capable of realizing CT perfusion and energy spectrum liver scanning simultaneously. According to the image processing method capable of realizing CT perfusion and energy spectrum liver scanning simultaneously, first, a CT machine is adopted for carrying out image locating and CT plain scanning on a patient, then, a contrast agent is injected, perfusion scanning and energy spectrum enhanced scanning are carried out, wherein the whole scanning period comprises 5 stages, the first stage and the third stage are perfusion scanning, the second stage, the fourth stage and the fifth stage are energy spectrum enhanced scanning, and through one-time scanning, perfusion and energy spectrum images are obtained simultaneously. The radiation dosage can be manually controlled and reduced, and therefore, the defects that in the existing similar technologies, the radiation dosage can not be regulated, and the radiation dosage is high are overcome; the perfusion image can provide the dynamic blood supply change characteristic of lesion, and the energy spectrum enhanced image can provide an image with the multiparameter mode beneficial for focus diagnosis and differential diagnosis; the perfusion image and the energy spectrum image can be obtained easily and conveniently through the one-time scanning method, thus abundant diagnosis information is provided for the clinic, and the radiation dosage of patients is reduced.

Methods and systems are provided for adaptive scan control. In one embodiment, a method includes, upon a first injection of a contrast agent, processing acquired projection data of a monitoring area of a subject to measure a contrast signal of the contrast agent, determining when each of a plurality of zones of a contrast scan are estimated to occur based on the contrast signal, generating a scan prescription for the contrast scan based on when each of the plurality of zones are estimated to occur, and upon a second injection of contrast agent, performing the contrast scan according to the scan prescription.

The embodiments of the invention provide a blood vessel analysis method and system. The blood vessel analysis method comprises the following steps that a peak period phase in a plurality of period phases is determined based on perfusion scanning data of the multiple period phases; image reconstruction is carried out based on the perfusion scanning data of the peak period phase to obtain a reconstruction result; and blood vessel analysis is carried out on the reconstruction result.

The invention relates to the technical field of scanning imaging, in particular to a low-dosage CT perfusion scanning imaging system and aims at solving the problems in the prior art. The low-dosage CT perfusion scanning imaging system comprises a moving table, a scanning imager and a CT perfusion imaging scanning system arranged in scanning imager; an image processing system is in communication connection to the CT perfusion imaging scanning system; the CT perfusion imaging scanning system comprises a main control module; and a spiral CT scanning module and a CT perfusion imaging scanning module are in communication connection to the main control module. For a low-dosage CT perfusion imaging target scanning technology, functional information on the aspect of blood flow dynamics of peripheral lymph nodes of stomach cancer can be provided, and a perfusion parameter BF value is a marker which is more effective than a parameter PS or the size of the lymph nodes on the aspect of pre-operative identification and diagnosis of perigastric metastasis and reactive hyperplastic lymph nodes, so that pre-operative precise staging of the stomach cancer is facilitated, unnecessary cleaning of the reactive hyperplastic lymph nodes in an operation can reduced, and prognosis of a patient is improved.

The invention discloses a coronary artery microcirculation detection and coronary artery analysis system. A diagnosis method which is based on a CT perfusion imaging technology and is used for safely, rapidly and effectively evaluating coronary artery microvascular functions is established through fluid mechanics, and a rapid, accurate and non-invasive coronary artery microcirculation function evaluation method is established for disease diagnosis and treatment and treatment strategy guidance. In combination with the achievement of a team on CT-FFR research and development in recent years, the invention aims to establish a CT perfusion scanning-based coronary artery microcirculation function evaluation method CT-IMR, evaluate the diagnosis accuracy through clinical verification and develop a non-invasive method for accurately and quickly evaluating the coronary artery microcirculation function by virtue of CT iconography, so that the clinical requirements are met, and a brand-new non-invasive IMR system is found. Compared with an existing method, the system has the advantages of being non-invasive, rapid, accurate, safe, economical and the like, and the non-invasive IMR system can detect cases with only coronary artery microangiopathy and can also detect cases with combined coronary artery macrovascular diseases.

The invention belongs to the technical field of image scanning, and particularly relates to an image reconstruction method and application thereof. Existing image reconstruction needs to perform repeated same-dose CT scanning on a patient for many times to reconstruct a dynamic image sequence meeting clinical diagnosis standards, so a large X-ray radiation dose is brought to the patient, and a potential risk of causing radiation lesion of a scanned part exists. The invention discloses a separation and reconstruction method based on a dynamic perfusion enhanced image and a sparse angle image acquisition scheme based on a dynamic image sequence. The method comprises the steps: reconstructing a heart tissue contrast enhanced image caused by a developer by means of developer time evolution information naturally contained in the dynamic image sequence, and superposing the reconstructed enhanced image to a baseline image obtained by a normal dose acquisition scheme to obtain a final dynamicperfusion scanning image sequence. And the radiation dose of dynamic perfusion imaging on a patient is remarkably reduced.

The invention discloses a head supporting device for CT perfusion examination, and relates to the technical field of CT equipment. The device comprises a CT scanning assembly used for CT perfusion scanning, a head supporting mechanism used for adjusting the head supporting angle and a head supporting plate used for supporting the head; the CT scanning assembly comprises a CT scanner and a bed frame body, wherein a bed body used for installing the head supporting mechanism is movably arranged in the bed frame body; the head supporting mechanism comprises a mounting base plate arranged at the bottom of the bed body, an electric push rod is arranged at the top of the mounting base plate, and a control block is fixedly arranged at the output end of the electric push rod. The head supporting assembly and the head supporting plate are arranged, the head of a patient is supported through the head supporting plate, the height and angle of the head supporting plate are adjusted in cooperation with the two inclined supporting rods and the top plate, so that the head of the patient is kept upturned, positioning of the head supporting plate is completed through the electric push rod, the operation process is simple and rapid, angle adjustment is accurate, and wide application prospects are realized.

The invention relates to using a perfusion scanning medical imaging technique to generate an image of a perfusable structure of an organism. A fluid is flowing through the structure, and a dose of a traceable agent is present in the fluid. The evolution of the spatial concentration of the agent, e.g., a set of values of the magnitude of the concentration assumed at various moments over a period of time, is determined for a plurality of locations within the structure. The spatial pattern of the evolutions is analyzed and an image is generated on the basis of this analysis in order to enable the medical practitioner to draw conclusions about the dispersion characteristics of the perfusable structure.

The invention belongs to the technical field of medical CT imaging, and particularly relates to a CT image separation and reconstruction method and application. A sparse-angle X-ray scanning scheme can significantly reduce the radiation dose caused by repeated scanning, but there is no effective and feasible method for image reconstruction of sparse-angle image acquisition data. The invention provides a CT image separation and reconstruction method. The method comprises the following steps: step 1, separating a contrast-enhanced scanning image introduced by a developer from a dynamic perfusionscanning image; 2, reconstructing an enhanced image by using the contrast enhanced scanning image; and 3, fusing the enhanced image with a baseline image obtained by reconstructing a full-sampling baseline image acquisition image to obtain a perfusion CT reconstructed image. And artifacts in the fused dynamic perfusion image can be eliminated to a great extent.

The invention relates to a perfusion scanning and reconstruction method and device, and the method comprises the steps: selecting a plurality of reconstruction angle ranges from a scanning angle range according to a preset threshold value of reconstruction time resolution; and scanning a scanning object according to the scanning angle range, and performing real-time reconstruction on the projection data obtained by scanning at the starting angles of the plurality of reconstruction angle ranges until the reconstruction of the projection data in the whole reconstruction angle range is completed. By means of the technical scheme, the utilization limit of the scanning angle range can be improved, and the high requirement for the reconstruction time resolution in perfusion scanning can be met.

The invention discloses a region segmentation method and device. The method comprises the following steps: extracting a pixel value of a brain tissue image; performing parameter mapping on the parameter maps in the perfusion scanning data set and the pixel values of the brain tissue image; generating a superpixel image of each parameter graph by using a superpixel segmentation technology; defining the sum of the feature vectors of all the reference images, the NIHSS score feature vector and the feature vector of the brain MIP mapping image as a first feature matrix; defining the sum of the feature vectors of all the superpixel images as a second feature matrix; combining the first feature matrix and the second feature matrix to obtain a total matrix; and segmenting the penumbra and the ischemic core region through a machine learning algorithm and a 3D model filter. The full-automatic algorithm is adopted to segment the penumbra and the ischemic core area, and compared with a traditional segmentation technology, segmentation is more refined, segmentation time is greatly shortened, and segmentation efficiency is improved.

The embodiment of the invention discloses a perfusion scanning image reconstruction method and device, an image scanning apparatus and a storage medium. The method comprises the following steps: obtaining perfusion scanning data and corresponding perfusion scanning parameters; determining a scanning inflection point of at least one time point indicative of a movement direction change of the scanning table according to perfusion scanning parameters; obtaining at least two-stage perfusion scan data sets by dividing perfusion scanning data according to at least one scan inflection point; reconstructing the perfusion scanning data of each stage, and obtaining the reconstructed images. By introducing the scanning inflection point to reconstruct the perfusion scanning data obtained by a single continuous scanning step by step, the technical scheme simplifies the workflow of clinical scanning and the data processing calculation amount in the image reconstruction, thereby improving the imagingefficiency of the image scanning equipment.

Methods and systems are provided for adaptive scan control. In one embodiment, a method includes, upon an injection of a contrast agent, processing acquired projection data of an anatomical region of interest (ROI) of a subject to measure a contrast signal of the contrast agent, determining when each of a plurality of zones of a contrast scan are estimated to occur based on the contrast signal, updating a scan prescription for the contrast scan based on when each of the plurality of zones of the scan protocol are estimated to occur, and performing the contrast scan according to the updated scan prescription.

A system (100) for a targeted perfusion scan includes a computed tomography (CT) scanner (120), a feeding territory map (132) and a targeted perfusion unit (140). The CT scanner (120) performs a perfusion scan of a portion of tissues of an organ. The feeding territory map (132) maps arterial locations of an arterial vessel tree to spatially located organ tissues of the organ fed by the arterial locations. The targeted perfusion unit (140) includes one or more processors (164) configured to determine targeted coverage (200) from a location of a stenosis (112, 210) and the feeding territory map, and to control the CT scanner to perform the perfusion scan according to the determined targeted coverage.

The invention discloses a CT perfusion scanning method, system and storage medium, including obtaining the scan length of a part to be scanned; determining a perfusion scanning mode according to the scan length and the preset scan length of the part to be scanned, wherein the perfusion scanning mode includes a static perfusion scanning and a dynamic perfusion scanning; arranging the scanning timesand the scanning intervals of the part to be scanned in the determined perfusion scanning mode; processing the perfusion scanning for the part to be scanned according to the determined scanning timesand the scanning intervals, thereby being capable of avoiding the larger or smaller scanning intervals selected manually by users and making the arranged continuous scanning of time intervals namelythe scanning intervals of the same part to be more accurate. Under the premise of ensuring that images of the CT perfusion scanning are clear, the CT perfusion scanning method, system and storage medium can minimize the times of the continuous scanning of the same part as much as possible, reduce the amount of a contrast agent absorbed by patients, thereby reducing injuries to the patients.