1. A high resolution single photon emission computed tomography (SPECT) imaging system comprising: a rotating ring for surrounding anatomy which is to be imaged; at least one camera mount movably mounted to the rotating ring so that the camera mount can be moved radially relative to the axis of rotation of the rotating ring; and at least one gamma camera carried on the at least one camera mount, wherein the at least one gamma camera is focused on a single SPECT focal point; whereby, when the rotating ring is rotated about the anatomy which is to be imaged and the at least one camera mount is moved radially on the rotating ring, the single SPECT focal point of the at least one gamma camera carried by a camera mount follows a spiral pattern through the anatomy, whereby to produce a scan of the anatomy; wherein a plurality of camera mounts are movably mounted on the rotating ring so that each camera mount can be moved radially relative to the axis of rotation of the rotating ring, and further wherein each of the plurality of camera mounts comprises at least one gamma camera focused on a single SPECT focal point for that camera mount; and wherein two camera mounts are provided on the rotating ring, with the two camera mounts being disposed diametrically opposed to one another on the rotating ring, such that two SPECT focal points are provided, with each of the two SPECT focal points following a spiral pattern through the anatomy as the rotating ring is rotated about the anatomy which is to be imaged and two camera mounts are moved radially on the rotating ring, with the two SPECT focal points being diametrically opposed to one another as they follow their respective spiral paths.