Static CT (computed tomography) scanner and scattering X-photon correction method thereof

Abstract

A static CT (computed tomography) scanner comprises an X-ray source system, a detector system, a data acquisition system, a power system and a computer. The X-ray source system comprises an annular X-ray source and a front annular collimator arranged at an exit of the annular X-ray source. The annular X-ray source comprises a plurality of X-ray source modules, a plurality of collimator slits limiting emitting scope of X rays are distributed on the front annular collimator. The detector system comprises two annular detectors with the slits in between which are arranged on the inner side of the front annular collimator. Each annular detector comprises a plurality of detector modules capable of distinguishing energies for X photons. The front annular collimator can completely cover detection area of the detector modules. The detector system further comprises two rear annular collimators arranged on the inner side of the annular detectors and two annular monitoring detectors. The data acquisition system is connected with the detector system and the monitoring detectors. The computer processes data acquired by the data acquisition system and then reconstructs images.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a static CT scanner and a method for calibrating scattered X-rays thereof. Background technique [0002] Computed tomography (CT) scanner is a powerful medical imaging diagnostic equipment, which uses X-rays to scan a certain area of ​​the human body layer by layer to obtain projection information, and then the computer performs data processing and image analysis. reconstruction. The imaging process of X-ray is mainly as follows: the X-ray source generates X-photons, and X-photons are emitted in all directions in a straight line at the focal point of the X-ray source. Among the X photons entering the imaging object, a part is directly absorbed by the atoms of the imaging object; a part directly penetrates the imaging object and reaches the detector opposite to the X-ray source. These X photons are direct X photons, and their information is exactly required for imaging. However...

AI Technical Summary

Problems solved by technology

However, in this scheme, since the arc-shaped detector corresponding to each X-ray tube is difficult to center on the X-ray tube, it is difficult to use a traditional collimator to suppress the influence of scattered X-photons on imaging, resulting in CT poor image quality

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