RT Journal Article
SR Electronic
T1 Effect of Fanbeam Focus Misalignment on Multihead SPECT Imaging
JF Journal of Nuclear Medicine Technology
JO J. Nucl. Med. Technol.
FD Society of Nuclear Medicine
SP 314
OP 315
VO 24
IS 4
A1 Kalen, Joseph D.
A1 Arthur, John H.
A1 Jolles, Paul R.
YR 1996
UL http://tech.snmjournals.org/content/24/4/314.abstract
AB Multihead camera inspection usually examines only head alignment with parallel-hole collimators, therefore, fanbeam collimators are not analyzed. We demonstrate that acceptance testing should include evaluating fanbeam collimator alignment. Methods: Two sets of low-energy ultra-high resolution (LEUHR) fanbeam collimators, Sets A (misaligned) and B (aligned), were examined. SPECT acquisitions were acquired for the three point sources aligned in the Z and Y directions, offset in the X direction and a three-dimensional Hoffman brain phantom. Results: Cinematic display of the raw data revealed artifactual motion in the Y direction for collimator Set A (misaligned), a SPECT spatial resolution (FWHM) increase of 4 mm in the Y direction and 1 mm in the X direction for Set A compared to Set B. Reconstructed images from the three-dimensional Hoffman brain phantom resulted in no clinical discernible differences. Conclusion: We recommend testing fanbeam collimators during acceptance testing, before patient data is assumed to be reliable.