Are hydrogenated amorphous silicon arrays usable for tomographic imaging?

Author

Clinthorne, Neal H.

Author_Institution

Div. of Nucl. Med., Michigan Univ., Ann Arbor, MI, USA

Volume

41

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

1516

Lastpage

1521

Abstract

X-ray detectors based on large-area, hydrogenated amorphous silicon photodiode arrays may be useful for performing transmission CT using an X-ray source to acquire the attenuation map for PET and SPECT. Questions regarding the required noise properties of these detectors for current-integration mode transmission CT are answered in this investigation. A simple noise model is developed and from it the first- and second-order statistics are used to examine the propagation of signal and variance through the reconstruction to estimates of the linear attenuation coefficient. Simulation results for a-Si:H detectors are compared with those from a count mode ECT detector used for transmission scanning. For the relatively undemanding application to ECT attenuation correction, these arrays will be usable

Keywords

X-ray detection and measurement; biomedical equipment; computerised tomography; photodiodes; radioisotope scanning and imaging; PET; SPECT; Si:H; X-ray detectors; count mode ECT detector; current-integration mode transmission CT; first-order statistics; hydrogenated amorphous silicon arrays; large area photodiode arrays; medical diagnostic imaging; medical instrumentation; nuclear medicine; second-order statistics; signal propagation; simple noise model; tomographic imaging; Amorphous silicon; Attenuation; Computed tomography; Electrical capacitance tomography; Nuclear medicine; Optical imaging; Photodiodes; X-ray detection; X-ray detectors; X-ray imaging;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.322941

Filename

322941