Atomic number measurement precision of spectral decomposition methods for CT

Author

Heismann, B.J.

Author_Institution

Div. of Computed Tomography, Siemens Med. Solutions, PA

Volume

5

fYear

2005

fDate

23-29 Oct. 2005

Firstpage

2741

Lastpage

2742

Abstract

We have investigated the classical attenuation decomposition and base material decomposition CT algorithms invented by Alvarez and Macovski in 1976 for their ability to provide quantitative atomic number Z of a given attenuator. For this purpose we have generated attenuation functions of the elements from Z = 1 to Z = 20 from measured attenuation data. We have fitted these functions to two sets of base functions: 1. the photoelectric absorption + Klein-Nishina scattering model and 2. the effective bone and water attenuator model. The results indicate model mismatches in the range of DeltaZ = plusmn0.5 for the base material decomposition and DeltaZ = plusmn0.7 for the attenuation decomposition

Keywords

Compton effect; bioelectric phenomena; bone; computerised tomography; medical image processing; photoelectricity; CT; Klein-Nishina scattering model; atomic number measurement precision; attenuation decomposition; base material decomposition; effective bone; photoelectric absorption; spectral decomposition methods; water attenuator model; Absorption; Atomic measurements; Attenuation measurement; Attenuators; Bones; Computed tomography; Integral equations; Voltage; X-ray detection; X-ray scattering;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2005 IEEE

Conference_Location

Fajardo

ISSN

1095-7863

Print_ISBN

0-7803-9221-3

Type

conf

DOI

10.1109/NSSMIC.2005.1596903

Filename

1596903