Head-to-head comparison of a Si-photomultiplier-based and a conventional photomultiplier-based PET-CT system.

Marginally higher contrast in small spheres was seen for the SiPM-based scanner but there was no significant difference in detectability between the scanners. It was difficult to detect differences between the scanners, suggesting that the SiPM-based detectors are not the primary reason for improved image quality.