Title :
Preliminary study on an imaging system with a two-dimensional photodetector and a thermoluminescent plate
Author :
Takahashi, Hiroyulii ; Fukuda, Daiji ; Kurahashi, Tomohiko ; Iguchi, Tetsuo ; Nakazawa, Masaharu
Author_Institution :
Dept. of Quantum Eng. & Syst. Sci., Tokyo Univ., Japan
Abstract :
Currently, two dimensional photodetectors such as cooled CCDs are available. Although they suffer from their small sizes, they can take an optical image within a short time. To overcome the size restriction, we plan to use a memory-effect as is used in FCR. Multiple TL (thermoluminescence) plates are used to take a radiation image, and afterwards the TL plates are heated to obtain a visible light image. This configuration will realize both a fast time response and a large sensitive area. After a series of experiments, we have obtained TL images using a cooled CCD with ZnS, CsI, Gd2O2S phosphors at low temperatures down to liquid nitrogen temperature. These first results were encouraging ones both for the response time and the image quality
Keywords :
CCD image sensors; X-ray detection; X-ray imaging; diagnostic radiography; phosphors; photodetectors; thermoluminescence; 100 kV; 100 kV X-rays; CsI; Gd2O2S; ZnS; cooled CCD; fast time response; image quality; imaging system; large sensitive area; liquid N2 temperature; low temperatures; memory-effect; multiple TL plates; optical image; phosphors; radiography; size restriction; small sizes; thermoluminescent plate; two-dimensional photodetector; visible light image; Charge coupled devices; Delay; Nitrogen; Optical imaging; Optical sensors; Phosphors; Photodetectors; Temperature sensors; Time factors; Zinc compounds;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-3180-X
DOI :
10.1109/NSSMIC.1995.500385
