SNR performance comparison of dual-layer detector and dual-kVp spectral CT

Author

Heismann, B.J. ; Wirth, S.

Author_Institution

Siemens Med. Solutions, Forchheim

Volume

5

fYear

2007

fDate

Oct. 26 2007-Nov. 3 2007

Firstpage

3820

Lastpage

3822

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE

Conference_Location

Honolulu, HI

ISSN

1095-7863

Print_ISBN

978-1-4244-0922-8

Electronic_ISBN

1095-7863

Type

conf

DOI

10.1109/NSSMIC.2007.4436953

Filename

4436953