CT scan perfusion method and device

Abstract

The present invention provides a CT scan perfusion method and its device, comprising: starting from the moment t1 when a predetermined time elapses from the injection of the contrast agent, performing a single-layer CT tracking scan on the concentration of the contrast agent in the aorta with the first radiation dose; In the scan tracking, when the trigger point is reached, the scanning program is triggered, and at time t2, the arterial phase scan is performed on the organ with a second radiation dose greater than the first radiation dose, to obtain the arterial phase CT value; according to the arterial phase CT value Obtain the increase of CT value; set the arterial input function represented by the time density curve of the contrast agent in the artery during the scanning and tracking of the contrast agent, and obtain the blood flow of the organ according to the increase of the arterial input function and the CT value . The CT scanning perfusion method of the present invention avoids multiple repeated scans of the organs in the traditional method, not only can reduce the radiation dose to the human body, but also can make the operation simpler and easier, the result is accurate, and the patient's pain is reduced. discomfort.

Description

technical field

[0001] The invention relates to a CT scanning perfusion method and device. Background technique

[0002] Traditional dynamic-contrast CT perfusion (DyCTp) uses multi-phase dynamic scanning after injection of (iodine) contrast agent, often including 10-20 repeated CT scans with relatively fixed time intervals (1-2s). Then use the denser dynamic scan data mentioned above to obtain the arterial input function (the time density curve of the contrast agent in the aorta or its large branches) and the time density curve of the contrast agent in each voxel within the scan range, through the maximum slope method and deconvolution The blood flow of each voxel can be obtained by the volumetric method; especially in the whole organ perfusion imaging (measurement), the dynamic scanning coverage of the DyCTp method is the entire organ, that is to say, repeat 10-20 CT scans for the entire organ At this time, the X-ray radiation received by the subject is several times to d...

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