Tomographic imaging with a miniature gamma camera

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Conference Proceeding

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The feasibility of single-photon emission computed tomography (SPECT) using a prototype miniature gamma camera has been investigated. The camera consists of a sodium iodide (NaI(TI)) crystal coupled to a single position-sensitive photomultiplier tube (PSPMT) and uses a maximum-likelihood algorithm to determine position estimates. The prototype system has been used to obtain projection data from a phantom, filled with technetium-99m (Tc-99m), that simulates a human forearm. Tomographic images were reconstructed via filtered backprojection. Images were also reconstructed from subsets of the projection data to examine the effects of limited-projection and limited-angle tomography. Using all projection data, objects as small as 2 mm are resolved. Larger objects are easily seen, even when the images are reconstructed from as few as 45 projections. In limited-angle reconstructions, large objects are also easily visualized, although artifacts exist. Our results indicate that the prototype camera can be adapted for tomographic imaging.

Publication Source (Journal or Book title)

IEEE Nuclear Science Symposium & Medical Imaging Conference

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