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

Eur J Nucl Med Mol Imaging. 2003 Sep;30(9):1205-10. doi: 10.1007/s00259-003-1213-2. Epub 2003 Jun 17.


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.

Publication types

  • Comparative Study
  • Evaluation Study
  • Validation Study

MeSH terms

  • Algorithms
  • Feasibility Studies
  • Gamma Cameras*
  • Image Enhancement / methods*
  • Imaging, Three-Dimensional / methods*
  • Phantoms, Imaging*
  • Quality Control
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Tomography, Emission-Computed, Single-Photon / instrumentation*
  • Tomography, Emission-Computed, Single-Photon / methods*