Dedicated cardiac PET

A detector comprising:

• a plurality of scintillation crystals, where each scintillation crystal of the plurality of scintillation crystals has a width, and wherein each scintillation crystal of the plurality of scintillation crystals is placed adjacent to each other so that first surfaces of the plurality of scintillation crystals form a first rectangular surface;
• and
• a reflective coating over the first rectangular surface with an open region grid pattern, wherein each open region forms a space wherein each space has a width equal to the width of a scintillation crystal of the plurality of scintillation crystals;
• and
• a plurality of photodetectors wherein each photodetector of the plurality of photodetectors is placed over a space, wherein the photodetector has a width greater than the width of the space over which the photodetector is placed;
• and
• at least one electronic readout electrically connected to the plurality photodetectors.