TY - GEN
T1 - Slit-slat collimator geometrical calibration for a PET/SPECT dual modality animal scanner
AU - Deng, Xiao
AU - Beaudoin, Jean Francois
AU - Cadorette, Jules
AU - Ma, Tianyu
AU - Lecomte, Roger
AU - Yao, Rutao
PY - 2011
Y1 - 2011
N2 - As part of our continued effort on developing a dual modality PET/SPECT imaging device based on an animal PET scanner, we studied two new techniques for calibrating the geometrical parameters of the slit-slat collimator insert based SPECT system. The collimator's slat-to-crystal position (SCP) in axial direction was determined from the cyclic pattern of the sensitivity profile of a series of 99mTc point source measurements in the axial direction. To calibrate the center of rotation (COR) and slit aperture centers (SACs), a 18F line source was first attached along one of the slits and imaged in PET mode at multiple rotational positions of the slit. The COR and SAC values were then estimated from the PET images of the line source. The calibration techniques were assessed with Monte Carlo simulated and experimental studies. The calibrated geometrical parameters were used in analytical calculation to generate the system matrix for SPECT image reconstruction. Phantom and animal studies were performed to demonstrate the imaging performance. The proposed new calibration methods were found effective in enabling slit-slat SPECT imaging on a PET scanner.
AB - As part of our continued effort on developing a dual modality PET/SPECT imaging device based on an animal PET scanner, we studied two new techniques for calibrating the geometrical parameters of the slit-slat collimator insert based SPECT system. The collimator's slat-to-crystal position (SCP) in axial direction was determined from the cyclic pattern of the sensitivity profile of a series of 99mTc point source measurements in the axial direction. To calibrate the center of rotation (COR) and slit aperture centers (SACs), a 18F line source was first attached along one of the slits and imaged in PET mode at multiple rotational positions of the slit. The COR and SAC values were then estimated from the PET images of the line source. The calibration techniques were assessed with Monte Carlo simulated and experimental studies. The calibrated geometrical parameters were used in analytical calculation to generate the system matrix for SPECT image reconstruction. Phantom and animal studies were performed to demonstrate the imaging performance. The proposed new calibration methods were found effective in enabling slit-slat SPECT imaging on a PET scanner.
UR - https://www.scopus.com/pages/publications/84858680322
U2 - 10.1109/NSSMIC.2011.6152663
DO - 10.1109/NSSMIC.2011.6152663
M3 - Conference contribution
AN - SCOPUS:84858680322
SN - 9781467301183
T3 - IEEE Nuclear Science Symposium Conference Record
SP - 2439
EP - 2442
BT - 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
Y2 - 23 October 2011 through 29 October 2011
ER -