Dual-energy CT imaging system and method based on linear scanning track

Abstract

The invention belongs to the CT imaging technology field and especially relates to a dual-energy CT imaging system and method based on a linear scanning track. The method comprises the following stepsof carrying out linear track CT scanning on an object to be scanned, acquiring low-energy projection data through a low-energy projection data acquisition path, and acquiring high-energy projection data through a high-energy projection data acquisition path, wherein the lengths of the two paths are equal, and the object to be scanned moves horizontally and linearly along one direction between a ray generating unit and a data detecting unit; and using a linear track CT reconstruction algorithm to carry out image reconstruction on the low-energy projection data and the high-energy projection data to obtain a dual-energy CT reconstruction image. Through placing a filter between the ray generating unit and the data detecting unit, the high and low energy projection information of the object under a linear track condition is obtained, and linear track X-ray dual-energy CT imaging is realized. The structure is simple, extra radiation sources and detectors do not need to be increased, the manufacturing cost of a dual-energy CT imaging system is greatly reduced, and a good application prospect is possessed.

Description

technical field [0001] The invention belongs to the technical field of CT imaging, in particular to a dual-energy CT imaging system and method based on a linear scanning trajectory. Background technique [0002] X-ray computed tomography (Computed Tomography, CT) is a technology to reverse the attenuation distribution of an object from the X-ray projection, covering nuclear physics, mathematics, computers, precision instruments and other disciplines. This technology uses the X-ray transmission information of the object at different angles, and obtains the attenuation characteristic distribution of the object through the image reconstruction algorithm, so as to realize the three-dimensional internal structure of the object without loss. Since Hounsfield successfully developed the first CT, CT technology has been successfully applied in many fields such as industrial non-destructive flaw detection, public place safety inspection and medical diagnosis. However, in practical ap...

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Problems solved by technology

Among them, the dual-source dual-detector mode and the single-source dual-detector mode have good imaging effects, but both need to add an additional ray source or detector; the fast kVp switching mode has a fast scanning speed, but the voltage conversion rate is limited, resulting in a decrease in the discrimination of the energy spectrum ;Slow kVp switching mode does not need to modify the CT equipment hardware, but its data acquisition time is long, so it is not suitable for applications with high imaging speed requirements

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