NDLI: A multiplex “OpenPET” geometry to extend axial FOV without increasing the number of detectors

Content Provider	IEEE Xplore Digital Library
Author	Yamaya, Taiga Yoshida, Eiji Inadama, Naoko Nishikido, Fumihiko Shibuya, Kengo Murayama, Hideo
Copyright Year	2008
Description	Author affiliation: Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan (Yamaya, Taiga; Yoshida, Eiji; Inadama, Naoko; Nishikido, Fumihiko; Shibuya, Kengo; Murayama, Hideo)
Abstract	At the last MIC conference, we proposed an “OpenPET” geometry, which consists of two axially separated detector rings of axial length W. A long and continuous field-of-view (FOV) including a 360-degree open gap G between two detector rings can be imaged though iterative image reconstruction. In addition to providing stress-less PET scanning and simultaneous PET/CT, the OpenPET is expected to lead to realization of in-beam PET. The OpenPET also extends the axial FOV with a limited number of detectors. The range of G to obtain the axially continuous FOV is represented as aW (0≪a≪=1). The extension gain, which is defined as [extended axial FOV size] / [original axial FOV size], is limited to (2+a)/2. In order to increase the gap and the axial FOV, therefore, we have to extend W itself. However the extension of W results in cost enhancement of the scanner. In this paper, we propose a new “multiplex OpenPET” geometry, which can extend axial FOV without increasing the number of detectors. In the first step, two detector rings of axial length W are separated by the gap aW, and we have a pseudo scanner, unit, of axial length W =(2+a)W. In the second step, two units can be separated by the gap aW, and we have unit of axial FOV $W=(2+a)^{2}W.$ After repeating these steps N times, we finally have unit, which has a long axial FOV of $W=(2+a)^{N}W.$ Here the extension gain is represented as ${(2+a)/2}^{N}.$ Theoretically it can be increased to an unlimited extent, although there is no gain in sensitivity. Simulation results show that fine reconstructed images are obtained by the multiplex OpenPET geometry. In addition to the extended gap, the proposed geometry is expected to help realize an affordable entire body PET scanner that enables whole body dynamic imaging.
Starting Page	4550
Ending Page	4552
File Size	2678618
Page Count	3
File Format	PDF
ISBN	9781424427147
ISSN	10957863
DOI	10.1109/NSSMIC.2008.4774339
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-19
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Geometry Detectors Positron emission tomography Image reconstruction Costs Nuclear and plasma sciences Microwave integrated circuits Computed tomography Solid modeling Whole-body PET
Content Type	Text
Resource Type	Article

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