Pinhole; Single photon emission tomography; SPECT; Pinhole-SPECT; Reconstruction; OSEM
Abstract :
[en] This study investigated the feasibility of ordered subsets expectation maximisation (OS-EM) reconstruction of pinhole single-photon emission tomography (SPET) acquired with a tilted detector head and a 180 degrees orbit. Phantom and patient data were recorded using a standard single-head camera. Reconstructions were performed using a dedicated OS-EM algorithm. Reconstructed images of line, uniformity and Picker's thyroid phantoms showed that the geometry, physical size and uniformity of the radioactive objects were preserved. For the range of radius corresponding to the patient studies, the measured full-widths at half-maximum lay between 4.90+/-0.25 mm and 6.05+/-0.25 mm. Finally, the gain in resolution associated with the use of the pinhole collimator instead of a parallel-hole collimator was highlighted in a parathyroid exploration and in a shoulder bone study.
Disciplines :
Radiology, nuclear medicine & imaging
Author, co-author :
Seret, Alain ; Université de Liège - ULiège > Département de physique > Imagerie médicale expérimentale
Defrise, Michel ; Vrije Universiteit Brussel - VUB > Division of Nuclear Medicine
Blocklet, Didier; Hôpital Erasme - Université Libre de Bruxelles - ULB > Service des Radioisotopes
Language :
English
Title :
180 degrees Pinhole SPET with a tilted detector and OS-EM reconstruction: phantom studies and potential clinical applications
Publication date :
December 2001
Journal title :
European Journal of Nuclear Medicine
ISSN :
0340-6997
eISSN :
1432-105X
Publisher :
Springer-Verlag, New York, United States - New York
The original publication is available at www.springerlink.com. The authors thank Springer-Verlag for allowing deposit of their final version on the ULg institutional repository.
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