JPH0319511B

PURPOSE:To attain to enhance the image quality of a tomographic image by preventing the lowering in the shunt resistance of a photodiode and reducing light crosstalk, by interposing a transparent sheet, to which at least one or more of obscure strip is formed between a scintillator and the photodiode so as to allow the same to position at the insensitive part of the photodiode. CONSTITUTION:Transparent parts 2A and obscure parts 3 are alternately formed to a transparent sheet 2 and the sensitive parts of a photodiode PN are positioned under the transparent part 2A while the insensitive parts thereof are positioned under the obscure parts 3. This obscure part 3 is formed of at least one or more of a strip. By adhereing the sheet between the photodiodes PN1-PNn and scintillators S1-Sn in a state interposed therebetween so that the obscure parts 3 are positioned at the insensitive parts of the photodiodes, the light emission of the scintillator element Sn can reduce the crosstalk of light invading into the other photodiodes adjacent to the photodiode PNn corresponding to said elements Sn.