32 results about "Perfusion scanning" patented technology

Methods and systems are provided for adaptive scan control. In one embodiment, a method comprises: while performing a scan of a scan subject, processing acquired projection data to measure a contrast level; responsive to the contrast level increasing above a first threshold, automatically switching the scan from a first scan protocol to a second scan protocol; responsive to the contrast level decreasing below a second threshold, automatically switching the scan from the second scan protocol to the first scan protocol; and responsive to the contrast level decreasing below a third threshold, automatically ending the scan. In this way, multiple scan protocols, such as angiography and perfusion scan protocols, can be interleaved within a single scan without the use of a separate timing bolus scan.

Methods and systems are provided for adaptive scan control. In one embodiment, a method includes, upon an injection of a contrast agent, performing a plurality of perfusion acquisitions of a first anatomical region of interest (ROI) of a subject with the imaging system, processing projection data of the first anatomical ROI obtained from the plurality of perfusion acquisitions to measure a contrast signal of the contrast agent, performing a plurality of angiography acquisitions, each angiography acquisition performed at a respective time determined based on the contrast signal, and performing one or more additional perfusion acquisitions between each angiography acquisition.

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.

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 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 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.