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Open Access 01-12-2017 | Original research

Optimal MRI sequences for ⁶⁸Ga-PSMA-11 PET/MRI in evaluation of biochemically recurrent prostate cancer

Authors: Spencer T. Lake, Kirsten L. Greene, Antonio C. Westphalen, Spencer C. Behr, Ronald Zagoria, Eric J. Small, Peter R. Carroll, Thomas A. Hope

Published in: EJNMMI Research | Issue 1/2017

Abstract

Background

PET/MRI can be used for the detection of disease in biochemical recurrence (BCR) patients imaged with ⁶⁸Ga-PSMA-11 PET. This study was designed to determine the optimal MRI sequences to localize positive findings on ⁶⁸Ga-PSMA-11 PET of patients with BCR after definitive therapy. Fifty-five consecutive prostate cancer patients with BCR imaged with ⁶⁸Ga-PSMA-11 3.0T PET/MRI were retrospectively analyzed. Mean PSA was 7.9 ± 12.9 ng/ml, and mean PSA doubling time was 7.1 ± 6.6 months. Detection rates of anatomic correlates for prostate-specific membrane antigen (PSMA)-positive foci were evaluated on small field of view (FOV) T2, T1 post-contrast, and diffusion-weighted images. For prostate bed recurrences, the detection rate of dynamic contrast-enhanced (DCE) imaging for PSMA-positive foci was evaluated. Finally, the detection sensitivity for PSMA-avid foci on 3- and 8-min PET acquisitions was compared.

Results

PSMA-positive foci were detected in 89.1% (49/55) of patients evaluated. Small FOV T2 performed best for lymph nodes and detected correlates for all PSMA-avid lymph nodes. DCE imaging performed the best for suspected prostate bed recurrence, detecting correlates for 87.5% (14/16) of PSMA-positive prostate bed foci. The 8-min PET acquisition performed better than the 3-min acquisition for lymph nodes smaller than 1 cm, detecting 100% (57/57) of lymph nodes less than 1 cm, compared to 78.9% (45/57) for the 3-min acquisition.

Conclusion

PSMA PET/MRI performed well for the detection of sites of suspected recurrent disease in patients with BCR. Of the MRI sequences obtained for localization, small FOV T2 images detected the greatest proportion of PSMA-positive abdominopelvic lymph nodes and DCE imaging detected the greatest proportion of PSMA-positive prostate bed foci. The 8-min PET acquisition was superior to the 3 min acquisition for detection of small lymph nodes.

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Title: Optimal MRI sequences for 68Ga-PSMA-11 PET/MRI in evaluation of biochemically recurrent prostate cancer
Authors: Spencer T. Lake
Kirsten L. Greene
Antonio C. Westphalen
Spencer C. Behr
Ronald Zagoria
Eric J. Small
Peter R. Carroll
Thomas A. Hope
Publication date: 01-12-2017
Publisher: Springer Berlin Heidelberg
Published in: EJNMMI Research / Issue 1/2017
Electronic ISSN: 2191-219X
DOI: https://doi.org/10.1186/s13550-017-0327-7

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Optimal MRI sequences for ⁶⁸Ga-PSMA-11 PET/MRI in evaluation of biochemically recurrent prostate cancer

Abstract

Background

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Results

Conclusion

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