Coded aperture imaging system and coding code plate thereof

Abstract

The invention discloses a coded aperture imaging system and a coding code plate thereof. The coding code plate comprises a metal part and one or more open holes; and in any range with the size of (4N+1) * (4N+1) of the coding code plate, the sum of the sizes of the open holes is (2N+1) * (2N+1), the any two sizes are in the range of (4N+1) * (4N+1), and the patterns of the open holes are not all the same. The coding code plate disclosed by the invention can not introduce the noise of the system due to the coding way; and furthermore, the coding code plate disclosed by the invention is simple in structure, reduces the processing difficulty and cost, and improves the assembly precision.

Description

technical field [0001] The invention relates to the technical field of radiation detection and imaging, in particular to an encoding code plate and an encoding aperture imaging system using the encoding code plate. Background technique [0002] At present, radioactive detection imaging technology has been widely used in nuclear industry, radioactive environmental monitoring, entry-exit security inspection and other fields to monitor the storage, transportation and use of radioactive materials. The core of this ray imaging technology is the design of collimator and detector. The radiation emitted by the radiation source passes through the collimator to produce a certain projection shape, and the detector interacts with the radiation to generate a measurement signal, thereby realizing the measurement of the projection image, and then reconstructing the image of the radiation source through an algorithm. [0003] In the traditional radiation detection imaging technology, imagi...

AI Technical Summary

Problems solved by technology

[0012] 1. The encoding method is complicated, and the encoding code plate is composed of several "isolated" units, which have no support for each other, and it is difficult to process and fix the code plate

[0013] 2. Although the circular nesting method can be used to expand the field of view, at the same time, the caliber (area) of the probe equipped with collimator and detector in the entire coding control imaging system is expanded to four times that of the original coding. Consider using heavy metals to shield the background rays. The increase of the aperture will greatly increase the weight of the system, which limits the improvement of the system in terms of integration and portability

[0014] From the technical solution of Document 1, combined with other solutions of the prior art, it can be known that the coding aperture imaging theory of the prior art usually has a relatively complicated coding code plate pattern

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