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Abstract
A handheld, high-resolution small field of view (SFOV) pinhole gamma camera has been characterised using a new set of protocols adapted from standards previously developed for large field of view (LFOV) systems. Parameters investigated include intrinsic and extrinsic spatial resolution, spatial linearity, uniformity, sensitivity, count rate capability and energy resolution. Camera characteristics are compared to some clinical LFOV gamma cameras and also to other SFOV cameras in development.
Highlights
Nuclear medical images are typically acquired using large field of view (LFOV) gamma cameras designed for whole body scanning and SPECT imaging
The procedures described in this communication were successful in translating LFOV standards to methods applicable to the compact gamma camera (CGC)
small field of view (SFOV) cameras are often designed for specific purposes such as sentinel lymph node biopsy, parathyroid gland surgery and radioimmunoguided surgery [1]
Summary
Nuclear medical images are typically acquired using large field of view (LFOV) gamma cameras designed for whole body scanning and SPECT imaging. Spatial uniformity was measured with a number of flood images, obtained using a 3 mm diameter 25 MBq 99mTc filled source at a distance of 250 mm from the uncollimated detector face. A larger non-uniformity effect is introduced by variability in thermal effects across the CCD e partly due to a temperature gradient and partly due to longer readout times for some pixels Based on the camera geometry this would be expected to vary by approximately 20% [8] across the CCD due to changes in sensitivity with angle This should be corrected for in clinical imaging by using a flood mask taken with the pinhole in place. Pinhole collimators have a well-established height-dependent sensitivity that can be calculated from Equation (4) [8]
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