A Novel Square-hole Based Coded Aperture Imaging Method

被引：0

作者：

Shuai, Lei ^{[1
,2
]}

Liang, Xiuzuo ^{[1
,2
]}

Zhang, Zhiming ^{[1
,2
]}

Zhang, Yiwen ^{[1
,2
]}

Hu, Tingting ^{[1
,2
]}

Wei, Long ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Div Nucl Technol & Applicat, Beijing 100049, Peoples R China

[2] Beijing Engn Res Ctr Radiog Techn & Equipment, Beijing 100049, Peoples R China

来源：

2016 IEEE NUCLEAR SCIENCE SYMPOSIUM, MEDICAL IMAGING CONFERENCE AND ROOM-TEMPERATURE SEMICONDUCTOR DETECTOR WORKSHOP (NSS/MIC/RTSD) | 2016年

基金：

中国国家自然科学基金;

关键词：

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Coded Aperture Imaging (CAI) plays a high performance in remote radiation measurement, an imaging method using high-energy radiation with a spectrum raging from x ray to gamma ray has found many applications, including high-energy astronomy and environment monitoring. The kernel of CAI is the coded mask (encoding array) with the relevant decoding array which are usually designed jointly to reconstruct a perfect or near-perfect original image. In this paper, we've developed a novel square-hole based CAI system which is predicted to have good properties and sensitivity. The coded aperture (CA) is designed to be a (4N+1)x(4N+1) area mask with a (2N+1)x(2N+1) area square hole transparent for gamma-ray(N is a natural number, implying the size of coding scale). In this method, a decoding function is structured to ensure the point spread function being a delta function. Unlike conventional pinhole imaging, by sampling the projection of a large square hole as a coded arrays, a high resolution imaging can be reconstructed, meanwhile a highly detection efficiency is obtained. Compared to the widely used Modified Uniformly Redundant Array (MURA) coding pattern, the square-hole has its remarkable characteristics. The square-hole is more alterable meaning that the coding numbers of a certain square-hole mask is decided by the sampling precision of detector, thus providing the user with a wider selection of coded aperture patterns to match his particular needs.

引用

页数：3