Title :
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
fDate :
8/1/1994 12:00:00 AM
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;
Journal_Title :
Nuclear Science, IEEE Transactions on
