Assessment of Multi-Modality Quantitative Imaging for Evaluation of Response of Metastatic Prostate Cancer to Therapy

The study is an open label, non-randomized study designed to evaluate the diagnostic performance of SPECT CT. The study will consist of 3 cohorts, and a subset of the patients in cohort C will participate in a test-retest study, where the baseline SPECT/CT will be repeated. SPECT CT will be performed in all cohorts. Cohort A will evaluate SPECT CT by comparison to a Positron Emission Tomography (PET) scan using NaF. Cohort B will evaluate SPECT CT by comparison to 18F-DCFPyL PET/CT. Cohort C will evaluate SPECT CT by comparison to Whole Body Magnetic Resonance Imaging (WB-MRI). Eligible subjects will be enrolled in a non-randomized manner per the treating physician discretion.