1. A nuclear medical imaging system, comprising: a plurality of stationary detector units configured to encircle a patient to be imaged, said plurality of stationary detector units being responsive to radiation photons emitted by a radiopharmaceutically doped organ tissue mass of the patient to output a signal indicative of a radiation photon event; a plurality of angular orientation-sensing accelerometers each mounted on a respective stationary detector unit, each of said plurality of angular orientation-sensing accelerometers being configured to provide an angular position of the respective detector unit on which it is mounted, wherein a radiation photon event signal outputted by a stationary detector unit is tagged with a respective angular position provided by a respective angular orientation-sensing accelerometer; and an image processor configured to receive radiation photon event signals tagged with angular position information and to use said tagged signals to reconstruct an image of the doped organ tissue mass.