TY - GEN
T1 - Evaluation of planar tomography using large area planar positron imaging system
AU - Ni, Y. C.
AU - Jan, M. L.
AU - Yamashita, T.
AU - Okamoto, T.
AU - Kume, H.
AU - Chen, Sammy
AU - Tsurumi, N.
PY - 2006
Y1 - 2006
N2 - Thin study is to evaluate performances of a large area planar positron imaging system (PPIS-4800, Hamamatsu) using planar tomography reconstruction. The oblique angles of lines of response, which influence the imaging performances, vary with the detector-to-detector distance. In this study, distances between detectors were set to 300, 200, 120 mm for evaluating the spatial resolutions and the noise characteristics. The results show that the spatial resolutions are 1.9 mm (X), 1.7 mm (Y), and 12.7 mm (Z) at detector distance 300 mm. Because of the incomplete angles of lines of response for the stationary dual-plane geometry, the resolution in Z direction is much poorer than in X, Y directions. As the detector distance reduced to 200 mm and 120 mm the Z-direction resolutions were improved to 10.2 and 9.0 mm, respectively. However, the resolutions of X direction were degraded to 1.87 and 1.86 mm. The resolutions of Y were degraded to 2.36 and 2.37 mm. As for the image quality, the noise characteristics of 3D planar tomography are comparable to that of 2D planar image, although the total counts were dispersed to more voxels for planar tomography. Phantom images were shown to present detection ability of the PPIS-4800 with planar tomography reconstruction.
AB - Thin study is to evaluate performances of a large area planar positron imaging system (PPIS-4800, Hamamatsu) using planar tomography reconstruction. The oblique angles of lines of response, which influence the imaging performances, vary with the detector-to-detector distance. In this study, distances between detectors were set to 300, 200, 120 mm for evaluating the spatial resolutions and the noise characteristics. The results show that the spatial resolutions are 1.9 mm (X), 1.7 mm (Y), and 12.7 mm (Z) at detector distance 300 mm. Because of the incomplete angles of lines of response for the stationary dual-plane geometry, the resolution in Z direction is much poorer than in X, Y directions. As the detector distance reduced to 200 mm and 120 mm the Z-direction resolutions were improved to 10.2 and 9.0 mm, respectively. However, the resolutions of X direction were degraded to 1.87 and 1.86 mm. The resolutions of Y were degraded to 2.36 and 2.37 mm. As for the image quality, the noise characteristics of 3D planar tomography are comparable to that of 2D planar image, although the total counts were dispersed to more voxels for planar tomography. Phantom images were shown to present detection ability of the PPIS-4800 with planar tomography reconstruction.
UR - http://www.scopus.com/inward/record.url?scp=38649130698&partnerID=8YFLogxK
U2 - 10.1109/NSSMIC.2006.354263
DO - 10.1109/NSSMIC.2006.354263
M3 - 会议稿件
AN - SCOPUS:38649130698
SN - 1424405610
SN - 9781424405619
T3 - IEEE Nuclear Science Symposium Conference Record
SP - 1893
EP - 1895
BT - 2006 IEEE Nuclear Science Symposium - Conference Record
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors, Special Focus Workshops, NSS/MIC/RTSD
Y2 - 29 October 2006 through 4 November 2006
ER -