[en] This study investigated the feasibility of ordered subsets expectation maximisation (OS-EM) reconstruction of 180 degrees pinhole single-photon emission tomography (SPET) acquired in body contour mode (variable distance between the detector and the axis of rotation for each projection) with or without a tilted detector head. Four non-circular orbits were designed bearing in mind the rotation radius and tilt angle values of previous pinhole SPET acquisitions in patients with circular orbits. The reconstructions were performed using a dedicated OS-EM algorithm. Reconstructed images of line and uniformity phantoms showed that the spatial and uniformity characteristics of the radioactive objects were preserved. In comparison with the circular orbits, the non-circular orbits allowed only a moderate gain (maximum 10%) in resolution. However, body contour pinhole SPET would significantly facilitate the camera set-up and in this way should decrease the camera set-up time, which is an important parameter in patient studies.
Disciplines :
Radiology, nuclear medicine & imaging
Author, co-author :
Seret, Alain ; Université de Liège - ULiège > Département de physique > Imagerie médicale expérimentale
Flérès, David; Université de Liège - ULiège > Département de physique > 2001-2002
Firket, Olivier; Hôpital Erasme - Université Libre de Bruxelles - ULB > Service des Radioisotopes
Defrise, Michel ; Vrije Universiteit Brussel - VUB > Division of Nuclear Medicine
Language :
English
Title :
Body contour 180 degrees pinhole SPET with or without tilted detector: a phantom study
Publication date :
September 2003
Journal title :
European Journal of Nuclear Medicine and Molecular Imaging
The original publication is available at www.springerlink.com. The authors thanks Springer-Verlag for allowing deposit of their final version on the ULg institutional repository.
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