A kind of ct scan image reconstruction method and ct scanner

Abstract

The embodiment of the present invention discloses a CT scan image reconstruction method, the method comprising: performing a first scan and obtaining first projection data; performing a second scan and obtaining second projection data; determining the second projection data fill the data in the data filling point; fill the data filling point corresponding to the data in the first projection data to the data filling point; use the filled second projection data to reconstruct the second scanning image. The embodiment also discloses a CT scanner. The invention eliminates the truncation artifact of the reproduced image, improves the quality of the reconstructed image, and increases the accuracy of the doctor's disease diagnosis.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a CT scan image reconstruction method and a CT scanner. Background technique [0002] CT (Computed Tomography) is electronic computerized tomography. During the clinical CT scanning process, it often includes multiple sets of scanning sequences. sequence etc. In the traditional technology, in order to obtain complete projection data without truncation, the scanned X-ray needs to cover the whole body of the patient, see figure 1 , figure 1 The left and right diagrams are cross-sectional views perpendicular to the line connecting the head and feet of the human body, that is, cross-sectional views perpendicular to the direction of entering the bed. The X-ray source 102 irradiates the scanning bed 103 through the gap of the collimator 101 . The X-ray source refers to a device that generates X-rays, the collimator refers to a component that generates a radiation field of a certain ...

AI Technical Summary

Problems solved by technology

This method reduces the X-rays irradiated to the human body and saves the X-ray dose, but at the same time it causes a problem: figure 1 The projection data of the area outside the circle of radius R' in the right figure cannot be obtained, that is, the projection data is truncated

The appearance of truncation artifacts will lead to image distortion and abnormal CT values, which may mislead doctors in the diagnosis of diseases and affect the recovery of patients.

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