[en] In light of the scattering and absorption artifacts of nuclear medical imaging by PET and SPECT, we identified several candidate isotopes which afford to combine both techniques into one single isotope based imaging. The data of time coincidence measurements of annihilation quanta with the associated gamma ray provide for 3-D imaging by decay vertex reconstruction. Additionally, the data for conventional PET and SPECT imaging are simultaneously obtained without additional radiation dose to the patient. This method will vastly improve the image contrast and it provides multiple views based on software cuts of the images to the radiologist, enabling him/her to critically evaluate them for diagnosis