Abstract
Ring artifact appears on the image from SPECT (Single Photon Emission Computed Tomography) imaging system is related to the uniformity. Generally, ring artifacts arose due to the poor performance of the photomultiplier tubes (PMT) in the gamma camera. If one of the PMT cannot perform optimally, defects known as ring artifacts on the image will occur. Detecting the position of the PMT malfunction is a challenge. To study the detection of ring artifacts due to PMT malfunction, artifact reconstruction was conducted by masking one of the PMT on the gamma camera using a copper sheet sizes 4 × 4 cm2 and thickness 1 mm. The position of the copper sheet was varied on the horizontal (x) and vertical (y) axes from the center of the detector. Jaszczak phantom without inserts (cold rods and sector cold rods) was used as an imaging object during acquisition. The image results obtained are ring artifact if the copper sheet is positioned on the (x,0), and half-ring artifact on the (0,y).
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