Highly stable solid-state x-ray detector array.
A detailed analysis of the effects of temperature changes, over time and between array elements, on the generation of circular artifacts in images produced by x-ray computed tomography was reported. We give formulas for calculating--according to the x-ray energy, detector sensitivity, and observed image quality (contrast and spatial resolution)--the maximum offset temperature coefficient and maximum gain temperature coefficient that will allow circular-artifact-free imaging. A temperature-controlled and insulated solid-state x-ray detector array, consisting of Gd2O2S:Pr,Ce,F ceramic scintillators coupled to crystal Si pin-photodiodes and designed to meet the requirements for these coefficients, produced high-resolution artifacts-free CT images of a phantom head.
Takahashi
T
T
Central Research Laboratory, Hitachi, Ltd., Tokyo, Japan.
Nakagawa
M
M
Yoshida
M
M
Takeuchi
H
H
D016477:Artifacts; D006257:Head / Q000000981:diagnostic imaging; D006801:Humans; D008433:Mathematics; D008953:Models, Anatomic; D013696:Temperature; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods