Patent ID: 6847838

Claim:
A method for tracking a high intensity radioactive seed source in a living organism comprising: A) acquiring from outside of the living organism a plurality of images of the high intensity radioactive seed source in the living organism by exposing: I) a single position sensitive photomultiplier tube coupled to a low efficiency scintillator viewing the high intensity radioactive seed source in the living organism through a pinhole collimator array; II) a single position sensitive photomultiplier tube coupled to a low efficiency scintillator viewing the high intensity radioactive seed source in the living organism through a single pinhole collimator or a pinhole collimator array from a plurality of angles; or III) a plurality of position sensitive photomultiplier tubes each coupled to a low efficiency scintillator viewing the radioactive seed source in the living organism through a single pinhole collimator or a pinhole collimator array from a plurality of angles; and B) reconstructing the acquired images through computer based analysis and synthesis to produce a three dimensional image of the high intensity radioactive seed source in three dimensional space.