One embodiment provides an imaging device, including: an enclosure comprising a casing and a radiation lining arranged within the casing to provide a radiation shield, wherein the enclosure comprises a removable portion; a plurality of modular components; each of the plurality of modular components comprising a plurality of gamma detectors including semiconductor crystals and being removable from the imaging device; the plurality of modular components being arranged such that the plurality of gamma detectors are configured in an array configuration with each of the plurality of gamma detectors having a predetermined spacing from each other gamma detector; a plurality of electronic communication components, wherein the plurality of electronic communication components facilitate communication from each of the gamma detectors to a processor using a hierarchical communication technique; and a cooling system. Other aspects are described and claimed.