CT imaging system and method

Abstract

The invention discloses a CT imaging system and a method. The method includes: conducting common CT scanning on an object to obtain a common CT image, then determining an area-of-interest in the image, making use of a photon counting detector to perform CT scanning on the area-of-interest from multiple energy windows, and then re-establishing a high resolution image of the area-of-interest. The photon counting detector is employed to collect the photon counting projection data of multiple energy windows, so that decomposition of multiple basis functions can be carried out, the energy spectrum can have high discrimination, and the numerical stability can be good.

Description

technical field [0001] Embodiments of the present invention relate to radiation imaging, and in particular to a CT imaging system and method. Background technique [0002] Traditional single-energy and dual-energy X-ray imaging usually use scintillator-type detectors, and the collected signals reflect the overall energy deposition of polychromatic X-rays. Since the energy deposition is an energy-weighted integration of the X-ray energy spectrum, the imaging result cannot reflect the attenuation information of the material at a certain energy. [0003] Dual-energy imaging includes multi-energy CT using different X-ray energy spectra for imaging, which has a certain ability to distinguish substances, but due to the limitation of its physical model, the imaging results have certain systematic errors, and there is always a certain overlap between X-ray energy spectra area, which affects the material discrimination ability. Contents of the invention [0004] Aiming at the tec...

AI Technical Summary

Problems solved by technology

Since the energy deposition is an energy-weighted integration of the X-ray energy spectrum, the imaging result cannot reflect the attenuation information of the material at a certain energy

[0003] Dual-energy imaging includes multi-energy CT using different X-ray energy spectra for imaging, which has a certain ability to distinguish substances, but due to the limitation of its physical model, the imaging results have certain systematic errors, and there is always a certain overlap between X-ray energy spectra region, which affects the ability to discriminate between substances

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