Cascade modeling of pixelated scintillator detectors for x-ray imaging

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We have modeled the signal and noise propagation in a pixelated scintillator detector by using the cascaded linear-systems transfer theory. The main difference from the conventional homogeneous scintillator detector is the additional x-ray quantum sampling process at the beginning stage of the cascaded model. The additional sampling stage is expressed as a multiplication of the fill factor of the pixelated scintillator both in signal and noise. The numerical simulation shows that, while the detective quantum efficiency (DQE) degrades in the low spatial-frequency band due to the x-ray quantum sampling, the DQE maintains high values in the high-frequency band, which is due to the band-limited modulation-transfer function (MTF) property of the pixelated scintillator. The pixelated scintillator design is relatively insensitive to additive electronic noise in the DQE performance compared to the conventional design. As a potential solution to overcome the reduction of DQE in the low-frequency band with the pixelated scintillator design, we propose a partially pixelated scintillator design, which utilizes the concept of pre-filtering before the sampling process of the incident x-ray quanta.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2008-06
Language
English
Article Type
Article; Proceedings Paper
Keywords

MODULATION TRANSFER-FUNCTION; QUANTUM EFFICIENCY; DIGITAL RADIOGRAPHY; AMORPHOUS SELENIUM; SPATIAL-RESOLUTION; NOISE-PROPAGATION; DESCRIBE NOISE; LARGE-AREA; SYSTEMS; SIGNAL

Citation

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, v.55, no.3, pp.1357 - 1366

ISSN
0018-9499
DOI
10.1109/TNS.2008.919260
URI
http://hdl.handle.net/10203/92686
Appears in Collection
NE-Journal Papers(저널논문)
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