Image reconstruction method and system of medical CT machine based on Compton back scattering scanning

Abstract

The invention relates to an image reconstruction method and system of a medical CT machine based on Compton back scattering scanning. The method comprises the following steps: receiving back scatteredlight of X-rays emitted by an X-ray source on one side of a measured target after the X-rays pass through the measured target by a detector on the same side; performing calibration calculation basedon a Compton backscattering differential cross section algorithm to obtain a calibration coefficient; calculating to obtain a linear weakening coefficient by combining a direct proportion relation between the linear weakening coefficient and the measured target electron density; and then determining a depth correction factor by taking a transmission measurement result of the X-ray passing throughthe other side of the measured target as a reference so as to perform depth correction on the linear weakening coefficient, and reconstructing a distribution image of the linear weakening coefficientbased on coordinates after depth correction so as to realize image reconstruction. The method is based on the Compton back scattering scanning principle, scattering correction and various artifact correction are not needed, the requirement for application conditions such as environment equipment is low, mathematical calculation is simple, scanning imaging is rapid, the image quality is good, and the fidelity is high.

Description

technical field [0001] The invention relates to the technical field of medical imaging, in particular to an image reconstruction method and system of a medical CT machine based on Compton backscatter scanning. Background technique [0002] CT (Computed Tomography), that is, computerized tomography imaging technology, it uses precisely collimated X-ray beams, γ-rays, ultrasonic waves, etc., together with highly sensitive detectors, to conduct tomographic scans one by one around a certain part of the human body. Then generate medical images as a technical means of diagnosis reference, which can be used for the examination of various diseases. At present, CT is widely used in major cities in my country because of its fast scanning and clear images. For various lesions such as tumors and cysts, CT can find out the size, shape, number and possibility of surgical resection. Its application has laid the foundation of modern medical imaging and greatly increased the possibility of ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the image reconstruction method of the existing CT machine based on the principle of ray transmission and absorption at home and abroad, which requires a large number of scattering corrections and various artifact corrections in the algorithm. The operating conditions are harsh, the cost is too high, and the number of scans required is large and the time is long. , large amount of calculation, slow image reconstruction speed, etc., provide an image reconstruction method for medical CT machine, based on the principle of Compton backscatter scanning, without the need for scattering correction and various artifact correction and environmental equipment, etc. The application conditions are low, the mathematical calculation is simple, the scanning imaging is fast, the image quality is good and the fidelity is high

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