Nicole Pouliot

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The depth of interaction (DOI) in the scintillation crystal of a gamma camera is modifying the response of each photomultiplier, therefore introducing imprecision in the evaluation of both event energy and position. To compensate for these errors, an iterative 3-D maximum likelihood positioning algorithm (x, y, and DOI) was developed. An analytical(More)
The stochastic nature of the DOI (depth of interaction) and its influence on various imaging parameters is described. Specific effects of the DOI on the PM (photomultiplier) response of gamma cameras have been quantified. In a typical camera configuration and 140-keV photons, the DOI alone can account for a 6.4-mm discrepancy in position and 12% in energy(More)
The utility of low-energy photons can be investigated using statistical and physical models. Holospectral imaging exploits the correlation between energy frames to optimize primary photon representation. A relationship between energy frames can be established by the physical description of low-energy photons (or events). It is shown that those events not(More)
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