Speaker
Dr
Shoji Kawatsu
(Kyoritu General Hospital, National Center for Geriatrics and Gerontology)
Description
Traditionally, three dimensional (3-D) positron emission tomography (PET) image
reconstruction is performed with the filtered back projection (FBP) method or the
iterative reconstruction method [1,2]. These methods do not directly apply the
geometrical property of lines of response (LORs) whereby two LORs, which originate
from radioactive isotopes in the same position, lie within a few millimeters
distance of each other. We proposed, PNMLOR, a new image reconstruction method of 3-
D PET. The proposed method makes direct use of the elementary property of LORs,
which originate from radioactive isotopes in the same position. As an application
of the PNMLOR method, we present image reconstructions of a simulation of a
portable PET. GATE was used for simulation. In the simulation, CdTe was
assumed for the gamma ray detector. Each CdTe detector element was assumed to have
a cross-section of 2 mm x 2 mm and a depth of 5 mm. The detector array was arranged
as a cylinder having a diameter of 22 cm and a length of 20 cm.The CdTe detector
elements were placed all around the lateral face of the cylinder. Digital Hoffmann
phantom was used for a simulation. A simulation using the proposed method
demonstrated good resolution.
Author
Dr
Shoji Kawatsu
(Kyoritu General Hospital, National Center for Geriatrics and Gerontology)
Co-author
Mr
Noboru Ushiroya
(Wakayama National College of Technology)