Figure 4: Example results for a patient who received selected radiation therapy. The patient was 70-year-old male with a biopsy-proven prostate cancer Gleason score of 9. After radical prostatectomy (RP), PSA level increased to 4 ng ml−1 and he became refractory to androgen deprivation therapy (ADT). PSMA-SPECT/CT imaging indicated lymph node metastases near the left iliac blood vessels ([a] Whole-body planar images; [b] CT plain scan and [c] fused PSMA-SPECT/CT images.). MRI was unable to confirm the metastatic lymph node. Following PSMA-SPECT/CT imaging, the patient received selected radiation therapy and his PSA level decreased to 1.20 ng ml−1 .