Dual-energy under-sampling substance recognition system and method based on straight path scanning
A trajectory scanning and undersampling technology, applied in the field of radiation imaging, can solve the problems of inability to identify substances, unacceptable, and increased system cost, and achieve the effect of rapid dual-energy substance identification
Active Publication Date: 2012-05-30
TSINGHUA UNIV +1
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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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[0019] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components, although shown in different drawings. For clarity and conciseness, detailed descriptions of known functions and constructions incorporated herein will be omitted since they would otherwise obscure the subject matter of the present invention.
[0020] figure 2 is a schematic plan view describing the process of dual-energy undersampling substance identification based on straight-line trajectories according to an embodiment of the present invention. Such as figure 2 As shown, the dual-energy under-sampling substance identification imaging system according to the embodiment of the present invention adopts a CT image-based dual-energy projection under-sampling substance identification method. In the system of the embodiment of the present inv...
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The invention discloses a dual-energy under-sampling substance recognition system and a method based on straight path scanning. Low-energy projection data acquired by the whole layer of low-energy detector arrays in the straight path scanning process is used for carrying out CT reconstruction on the detected object; in a CT reconstruction image, a region image segmentation method is used for carrying out region segmentation and marking on a CT image according to attenuation coefficients; and meanwhile, projection data acquired by a few of high-energy detectors arranged behind a part of low-energy detectors is used for realizing dual-energy substance recognition imaging. Because straight paths are used and rotation is not needed, the mechanical design is simple, and the inspection clearance rate is high; and because only a small amount of the dual-energy detectors are used, the system cost is low.
Description
technical field [0001] 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 [0002] 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. [0003] At present, the dual-energy imaging system is the mainstream of the security inspection system capable of material identification, which is mainly divided into two categories. One type is a dual-energy perspective imaging system, but since the system reconstructs overlapping images of front and rear objects, it is easy to misreport or miss smuggled contraband. The other is a dual-energy CT imagi...
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IPC IPC(8): G01N23/04G06T11/00
Inventor 肖永顺陈志强张丽刘圆圆邢宇翔赵自然
Owner TSINGHUA UNIV