Objective: 68Ga-PSMA-PET/CT is a relatively new technique, that is rapidly becoming widespread. We aimed to contribute interobserver-intraobserver agreement of 68Ga-PSMA-PET/CT, among low/high-experienced interpreters.
Methods: 68Ga-PSMA-PET/CT of 56 patients with prostate cancer were evaluated blindly by four observers. Visual interpretation of malignant disease and SUVmax for lymph node (LN) regions, local tumor, bones and visceral organs were recorded. Cohen's Kappa and Fleiss' Kappa analyses were used to measure agreement between low/high/all-experienced observers. Variations were compared for regions, and the effect of prostate-specific antigen or Gleason score on the results was investigated.
Results: Interobserver agreement was almost perfect for all LN regions (LN1 low-experienced κ: 0.84/0.84, high-experienced 0.89/0.96; LN2 low-experienced κ: 0.88/0.79, high-experienced 0.95/0.95; LN3 low-experienced κ: 0.84/0.89, high-experienced 0.87/0.94, first/second readings, respectively) and bone lesions (low-experienced κ: 0.88/0.88, high-experienced 0.92/0.92, first/second readings, respectively). For local tumor, interobserver agreement was substantially-almost perfect among a high-experienced group (κ: 0.74/0.89, first/second readings, respectively), and was moderate-substantial among a low-experienced group (κ: 0.62/0.56, first/second readings, respectively). Intraobserver agreement was almost perfect for three observers for all regions and substantial for the observer with the lowest experience in LN3, local and visceral lesions (κ: 0.74/0.79/0.62, respectively).
Conclusion: Interpretation of prostate-specific membrane antigen (PSMA) for prostate cancer is acceptably consistent among observers, but some details are noteworthy. The evaluation should be done more algorithmically for local tumors, since all observers showed relatively lower agreement. The agreement increased as prostate-specific antigen and Gleason score increased. The observer with PSMA experience <30 readings showed lower reliability, distinct from the others. This indicates that although a reader may be familiar with other PET agents, a more consistent interpretation of 68Ga-PSMA-PET/CT requires training with a small number of identified cases.
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