Fig. 1

Maximum intensity projections of ^99mTc-HDP SPECT and ¹⁸F-NaF PET scans acquired (a) from the same 66-year-old prostate cancer patient and (b) from the same 75-year-old breast cancer patient. SUVs_peak are shown for most active lesions. The SPECT scan of the prostate cancer patient was acquired 2 days before the corresponding PET scan and the SPECT scan of the breast cancer patient 5 days after the corresponding PET scan