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 :
31 Oct-6 Nov 1993
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 appear to be usable
Keywords :
X-ray detection; arrays; biomedical equipment; photodiodes; positron emission tomography; signal detection; silicon radiation detectors; single photon emission computed tomography; Si:H; a-Si:H detectors; attenuation map; biomedical X-ray detectors; current-integration mode transmission CT; emission tomography; first-order statistics; hydrogenated amorphous silicon arrays; linear attenuation coefficient; noise properties; photodiode arrays; second-order statistics; signal propagation; simple noise model; tomographic imaging; Amorphous silicon; Attenuation; Computed tomography; Electrical capacitance tomography; Image reconstruction; Optical imaging; Photodiodes; Positron emission tomography; X-ray detectors; X-ray imaging;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1993., 1993 IEEE Conference Record.
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-1487-5
DOI :
10.1109/NSSMIC.1993.373579
