68 18 Purpose To prospectively compare diagnostic accuracies for detection of bone metastases by Ga-PSMA PET/CT, F-NaF PET/CT and diffusion-weighted MRI (DW -MRI) in prostate cancer (PCa) patients with biochemical recurrence (BCR). Methods Sixty-eight PCa patients with BCR participated in this prospective study. The patients underwent Ga-PSMA PET/CT, a F-NaF PET/CTand a DW -MRI (performed in accordance with European Society of Urogenital Radiology guidelines, with b values of 0 and 600 s/mm ). Bone lesions were categorized using a three-point scale (benign, malignant or equivocal for metastases) and a dichotomous scale (benign or metastatic) for each imaging modality by at least two experienced observers. A best valuable comparator was defined for each patient based on study-specific imaging, at least 12 months of clinical follow-up and any imaging prior to the study and during follow-up. Diagnostic performance was assessed using a sensitivity analysis where equivocal lesions were handled as non-metastatic and then as metastatic. Results Ten of the 68 patients were diagnosed with bone metastases. On a patient level, sensitivity, specificity and the area under the curve (AUC) by receiver operating characteristic analysis were, respectively, 0.80, 0.98–1.00 and 0.89–0.90 for Ga-PSMA PET/CT (n = 68 patients); 0.90, 0.90–0.98 and 0.90–0.94
European Journal of Nuclear Medicine and Molecular Imaging – Springer Journals
Published: Jun 6, 2018
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