Body contour 180 degrees pinhole SPET with or without tilted detector: a phantom study.

Abstract:

: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.

authors

Seret A,Flérès D,Firket O,Defrise M

doi

10.1007/s00259-003-1213-2

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

1205-10

issue

9

eissn

1619-7070

issn

1619-7089

journal_volume

30

pub_type

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