The invention relates to a gamma radiation detector that provides compensation for the parallax effect. The gamma radiation detector (100) includes a plurality of scintillator elements (101), a planar optical detector array (102), and a pinhole collimator (103) that includes a pinhole aperture (104). Each scintillator element has a gamma radiation receiving face (101') and an opposing scintillation light output face (101''). The gamma radiation receiving face of each scintillator element faces the pinhole aperture for generating scintillation light in response to gamma radiation received from the pinhole aperture. The scintillator elements are arranged in groups (105). Each group has a group axis (106) that is aligned with the pinhole aperture (104) and is perpendicular to the radiation receiving face of each scintillator in that group. The scintillation light output faces of each of the scintillator elements are in optical communication with the planar optical detector array (102).