In-plane resolution characteristics for a positron emission tomograph: Headtome IV

Headtome IV is a PET (positron emission tomograph) which consists of 96 detector units per ring. Each detector unit consists of eight 3-mm-wide bismuth germanate (BGO) crystals, a pair of light guides, and a dual module photomultiplier tube and uses pulse-height-ratio logic to determine the crystal of interaction. In-plane resolution of 4.5 mm full width at half maximum (FWHM) was obtained without any sampling motion such as wobble. The authors investigated three in-plane resolution characteristics of the Headtome IV, i.e. resolution with distance from the center, variation of the in-plane resolution and the effect of gain imbalance.<
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