Dual-energy under-sampling substance identification system and method based on linear track scanning

Abstract

The invention discloses a dual-energy under-sampling substance identification system and a dual-energy under-sampling substance identification method based on linear track scanning. The method comprises the following steps of: performing computerized tomography (CT) reconstruction on a detected object by using low-energy projection data obtained by a whole layer of low-energy detector array in the linear track scanning process, performing region segmentation on a tomographic image according to an attenuation coefficient by a regional image segmentation method in a CT reconstructed image, and labeling; and meanwhile, realizing dual-energy substance identification imaging by using projection data obtained by a few high-energy detectors arranged behind partial low-energy detectors. A linear track is utilized, and the rotation is not required, so the mechanical design is simple, and the inspection clearance rate is high; and only a few dual-energy probes are used, so the cost of the system is low.

Description

[0001] This application is a divisional application of the invention patent application 200910085923.0 filed on May 27, 2009, entitled "Dual Energy Undersampling Substance Identification System and Method Based on Linear Trajectory Scanning". technical field [0002] The invention relates to radiation imaging technology, in particular to a dual-energy undersampling material identification system and method based on linear trajectory scanning, which allows fast security inspection of objects. Background technique [0003] In recent years, due to the increasingly serious smuggling of dangerous goods such as drugs, explosives, and weapons, a security inspection system that can identify substances at low cost and quickly is of great significance in the field of combating contraband smuggling and other security fields. [0004] At present, the dual-energy imaging system is the mainstream of the security inspection system capable of material identification, which is mainly divided ...

AI Technical Summary

Problems solved by technology

However, due to the limitations of the CT system itself, the method proposed in this patent document can only reconstruct the shape information of the object and cannot perform material identification, so it is powerless to identify the contraband in the suitcase

If all the detectors used for the straight-line scanning trajectory are replaced with dual-energy detectors, the system cost will be greatly increased, which is not acceptable

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