Impact of a camera change in ventriculography

in European Journal of Nuclear Medicine (2000), 27

Maximum-likelihood reconstruction with ordered subsets in bone SPECT

in Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine (1999), 40(12), 1978-1984

This study was aimed at determining whether the ordered-subset expectation maximum (OSEM) is more effective than filtered backprojection (FBP) for bone SPECT in the routine clinical context. Methods ... [more ▼]

This study was aimed at determining whether the ordered-subset expectation maximum (OSEM) is more effective than filtered backprojection (FBP) for bone SPECT in the routine clinical context. Methods. Fifty-seven consecutive bone SPECT studies were analyzed. They included pelvic and lumbar spine, thoraco lumbar spine, head and neck, feet and shoulders. A 64-projection SPECT study was acquired over 360° by single-head cameras 2–3h after the injection of 750 MBq 99mTc-methylene diphosphonate. Three observers compared the OSEM and FBP reconstructed images. Results. Streak artifacts, always present with FBP, were rarely generated with the OSEM. When present (n = 24), artifacts associated with negative values near hyperactivities in FBP were not generated with the OSEM in 67% of the cases (n = 16), permitting a satisfactory interpretation of these regions. In half of the other cases (17%, n = 4/24), interpretation was precluded. In only one case did the three observers agree that more hyperactivities were seen with the OSEM. Ninety-six percent of the OSEM pictures were superior or equal to FBP for anatomic resolution and were clearly better in 12% of the cases. The extent of the lesion with the OSEM seemed better or equally defined in 96% and clearly better in 14% of the cases. The low-activity regions were better or equally visualized in all cases and were clearly better seen in 23% of the cases. The quality of the pictures was found to be better or superior with the OSEM in 98% of the cases and definitely better in 65% of the cases. Conclusion: Replacement of FBP by the OSEM in bone SPECT would be beneficial to clinical practice. [less ▲]

Median root prior for DMSA cortical renal SPET

in Tijdschrift voor Nucleaire Geneeskunde (1999), 21(3), 104

Pinhole SPECT of small animals using vendor standard equipment.

in Tijdschrift voor Nucleaire Geneeskunde (1999), 21(3), 103-104

Néoplasie mammaire plurifocale en généralisation osseuse

in Revue Médicale de Bruxelles (1998), 19

Clinical case.