Title :
Quantitative 131I SPECT with triple energy window Compton scatter correction
Author :
Dewaraja, Yuni ; Li, Jia ; Koral, Kenneth
Author_Institution :
Div. of Nucl. Med., Michigan Univ., Ann Arbor, MI, USA
Abstract :
In this work accuracy of quantitative 131I SPECT with triple energy window (TEW) scatter correction is evaluated by phantom measurements. The TEW method is a pixel by pixel correction where the scatter fraction in the photopeak window is estimated by linear interpolation between two adjacent narrow sub-windows. Quantification procedure includes marker based X-ray CT-SPECT image fusion to determine object boundaries and to generate attenuation maps. TEW scatter correction significantly reduces the effect of background activity on reconstructed counts within an object, but it still exists due to the finite position resolution of the system. Therefore, a background dependent calibration factor was used for quantification. Quantitative accuracy with TEW correction was 5% and 14% for a tumor and lung respectively of a physical phantom with non-uniform activity and non-uniform scattering medium
Keywords :
Compton effect; gamma-ray scattering; interpolation; medical image processing; single photon emission computed tomography; I; attenuation maps generation; background dependent calibration factor; linear interpolation; lung; marker based X-ray CT-SPECT image fusion; medical diagnostic imaging; nuclear medicine; object boundaries; phantom measurements; quantitative 131I SPECT; reconstructed counts; triple energy window Compton scatter correction; tumor; Attenuation; Calibration; Energy measurement; Fusion power generation; Image fusion; Image reconstruction; Imaging phantoms; Interpolation; X-ray imaging; X-ray scattering;
Conference_Titel :
Nuclear Science Symposium, 1997. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
0-7803-4258-5
DOI :
10.1109/NSSMIC.1997.670633
