Imaging protocols

A method of radioimaging a heart, to obtain a clinically-valuable image having a resolution of at least 7×7×7 mm of a volume of at least 5 cm diameter, comprising:

• administering a radiopharmaceutical to a patient at a low dose having an EDE (effective dose equivalent) of less than 2.5 millirem per Kg weight of said patient;
• acquiring radiation emission data from a heart of said patient using a collimated SPECT camera, said radiation being emitted by said low dose radiopharmaceutical, wherein said acquiring comprises acquiring radiation emission data from said heart for a period of 5 minutes or less using a SPECT camera, wherein said acquiring comprises blocking radiation from a field of view of said camera using one or more radiation attenuation elements;
• and
• reconstructing, from said data, a clinically-valuable image of a volume of about at least 5 cm diameter including at least a part of said heart at a resolution of at least 7×7×7 cubic mm, from said data.