Figure 4 - available via license: Creative Commons Attribution 3.0 Unported
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Blue line and red line used for plotting the profile of artifact image.
Source publication
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 occu...
Context in source publication
Context 1
... identify more accurate, it was necessary to quantify the ring artifact on image. Plot profile from image was taken from image as example shown in Figure 4, and the resulted plot profile in Figure 5. Thus the width of the ring is measured using imageJ. The width of the half ring (both generated above and below) was approximately 4 cm. ...
