Title :
An algorithm for three-dimensional reconstruction incorporating cross-plane rays
Author :
Clack, R. ; Townsend, D. ; Defrise, M.
Author_Institution :
Dept. of Math., Dalhousie Univ., Halifax, NS, Canada
fDate :
3/1/1989 12:00:00 AM
Abstract :
Conventional multislice positron cameras reconstruct a three-dimensional distribution of a positron-emitting radioscope as a set of two-dimensional transverse sections. Consequently, annihilation photons which cross two or more planes are eliminated from the data. Such an approach makes efficient use of the emitted photon flux. A method is proposed which makes more efficient use of the available photons by including both oblique and transverse section in the reconstruction. The implementation of the method consists of centering a scaled convolution filter on each detected coincidence event line and backprojecting the filter values through the three-dimensional reconstruction volume. The final image is normalized to allow for the different number of oblique and transverse sections that contribute to each point in the imaging volume. The method has been evaluated using both simulated data and measured data obtained with a routing area detector positron camera
Keywords :
computerised tomography; radioisotope scanning and imaging; 3D reconstruction algorithm; annihilation photons; cross-plane rays; medical diagnostic imaging; multislice positron cameras; nuclear medicine; positron emission tomography; scaled convolution filter; Area measurement; Cameras; Convolution; Event detection; Filters; Image reconstruction; Nuclear medicine; Position sensitive particle detectors; Positron emission tomography; Radioactive materials;
Journal_Title :
Medical Imaging, IEEE Transactions on