Title :
SNR performance comparison of dual-layer detector and dual-kVp spectral CT
Author :
Heismann, B.J. ; Wirth, S.
Author_Institution :
Siemens Med. Solutions, Forchheim
fDate :
Oct. 26 2007-Nov. 3 2007
Abstract :
Tube-based dual-kVp and detector-based dual- layer sandwich detector CT systems can be used to generate spectral CT data. We investigate the influence of their energy weighting functions on the performance of reconstructed base material coefficient images and projections. A Monte-Carlo (MC) simulation of the noise propagation for typical water and bone CT projections is used. We find a large difference in the SNR of the reconstructed coefficient projections. Dual-kVp scanning methods yield a factor of 2 better SNR in the coefficient projections than dual-layer detector based CT. This can be explained by the degree of overlap of the weighting functions, especially for low-energy X-ray quanta.
Keywords :
Monte Carlo methods; bone; computerised tomography; sensors; water; Monte-Carlo simulation; X-ray quanta; bone CT projections; dual-kVp spectral CT; dual-layer detector; noise propagation; scanning methods; tube-based dual-kVp detector CT systems; water; Attenuation measurement; Bones; Computed tomography; Image reconstruction; Nuclear and plasma sciences; Nuclear power generation; Signal to noise ratio; Voltage; X-ray detection; X-ray detectors;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-0922-8
Electronic_ISBN :
1095-7863
DOI :
10.1109/NSSMIC.2007.4436953
