Far field 3D localization of radioactive hot spots using a coded aperture camera

Sun Shifeng; Zhang Zhiming; Shuai Lei; Li Daowu; Wang Yingjie; Liu Yantao; Huang Xianchao; Tang Haohui; Li Ting; Chai Pei; Zhang Yiwen; Zhou Wei; Yang Mingjie; Wei Cunfeng; Ma Chuangxin; Wei Long

doi:10.1016/j.apradiso.2015.10.021

Far field 3D localization of radioactive hot spots using a coded aperture camera

Appl Radiat Isot. 2016 Jan:107:177-182. doi: 10.1016/j.apradiso.2015.10.021. Epub 2015 Oct 20.

Authors

Sun Shifeng¹, Zhang Zhiming², Shuai Lei², Li Daowu², Wang Yingjie², Liu Yantao², Huang Xianchao², Tang Haohui², Li Ting², Chai Pei², Zhang Yiwen², Zhou Wei³, Yang Mingjie³, Wei Cunfeng², Ma Chuangxin², Wei Long⁴

Affiliations

¹ Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: sunshf@ihep.ac.cn.
² Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China.
³ Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China; University of Chinese Academy of Sciences, Beijing 100049, China.
⁴ Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China. Electronic address: weil@ihep.ac.cn.

PMID: 26516991
DOI: 10.1016/j.apradiso.2015.10.021

Abstract

This paper presents a coded aperture method to remotely estimate the radioactivity of a source. The activity is estimated from the detected counts and the estimated source location, which is extracted by factoring the effect of aperture magnification. A 6mm thick tungsten-copper alloy coded aperture mask is used to modulate the incoming gamma-rays. The location of point and line sources in all three dimensions was estimated with an accuracy of less than 10% when the source-camera distance was about 4 m. The estimated activities were 17.6% smaller and 50.4% larger than the actual activities for the point and line sources, respectively.

Keywords: Coded aperture; Far-filed measurements; Gamma camera; Modified Uniformly Redundant Array (MURA); Source activity determination; Source localization.