Title :
Atomic number measurement precision of spectral decomposition methods for CT
Author_Institution :
Div. of Computed Tomography, Siemens Med. Solutions, PA
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;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2005 IEEE
Conference_Location :
Fajardo
Print_ISBN :
0-7803-9221-3
DOI :
10.1109/NSSMIC.2005.1596903
