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현수연,Mark Hammig,정만희 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.5
When gamma-camera sensor modules, which are key components of radiation imagers, are derived fromthe coupling between scintillators and photosensors, the light collection efficiency is an important factorin determining the effectiveness with which the instrument can identify nuclides via their derivedgamma-ray spectra. If the pixel area of the scintillator is larger than the pixel area of the photosensor,light loss and cross-talk between pixels of the photosensor can result in information loss, therebydegrading the precision of the energy estimate and the accuracy of the position-of-interaction determination derived from each active pixel in a coded-aperture based gamma camera. Here we present twomethods to overcome the information loss associated with the loss of photons created by scintillationpixels that are coupled to an associated silicon photomultiplier pixel. Specifically, we detail the use ofeither: (1) light guides, or (2) scintillation pixel areas that match the area of the SiPM pixel. Comparedwith scintillator/SiPM couplings that have slightly mismatched intercept areas, the experimental resultsshow that both methods substantially improve both the energy and spatial resolution by increasing lightcollection efficiency, but in terms of the image sensitivity and image quality, only slight improvementsare accrued.