On 68Ga-PSMA-11 PET/MRI for biochemically recurrent prostate cancer, small PSMA-positive lesions are detected on some, but not all MRI sequences. To determine the most effective sequences to obtain for a 68Ga-PSMA-11 PET/MRI protocol, the sensitivities of small FOV T2, T1 post-contrast, and diffusion-weighted sequences for identification of small abdominopelvic nodes were evaluated. In addition, multiphasic contrast-enhanced Differential Subsampling with Cartesian Ordering (DISCO) images were evaluated for detection of prostate bed recurrence. Examination of 48 consecutive patients indicates that small FOV T2 images are most sensitive for small abdominopelvic nodes and DISCO images are most sensitive for prostate bed recurrence.
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