Image Reconstruction for a Partially Collimated Whole Body PET Scanner.
Partially collimated PET systems have less collimation than conventional 2-D systems and have been shown to offer count rate improvements over 2-D and 3-D systems. Despite this potential, previous efforts have not established image-based improvements with partial collimation and have not customized the reconstruction method for partially collimated data. This work presents an image reconstruction method tailored for partially collimated data. Simulated and measured sensitivity patterns are presented and provide a basis for modification of a fully 3-D reconstruction technique. The proposed method uses a measured normalization correction term to account for the unique sensitivity to true events. This work also proposes a modified scatter correction based on simulated data. Measured image quality data supports the use of the normalization correction term for true events, and suggests that the modified scatter correction is unnecessary.
Alessio
Adam M
AM
A. M. Alessio, R. E. Schmitz, L. R. MacDonald, T. K. Lewellen, and P. E. Kinahan are with the Department of Radiology, University of Washington, Seattle, WA 98195 USA S. D. Wollenweber, C. W. Steams, S. G. Ross, and A. Ganin are with the GE Healthcare, Waukesha, WI 53188 USA.
Schmitz
Ruth E
RE
Macdonald
Lawrence R
LR
Wollenweber
Scott D
SD
Stearns
Charles W
CW
Ross
Steven G
SG
Ganin
Alex
A
Lewellen
Thomas K
TK
Kinahan
Paul E
PE