Yet, for low activity concentrations, this variability increased significantly, and COVs of the spheres became comparable to those seen at a multi-institutional level, suggesting that inter-center variation at low activities is likely more due to scanner performance than experimental error.
Same scanner Same scanner In 2/35 patients different PET/CT systems were used for the BL and the FU scans due to scanner breakdown (Table 1).
Inter-institutional variations in SUV due to scanner and protocol differences were expected.
A radiofrequency bias field correction algorithm eliminated intensity drifts due to scanner field inhomogeneity (29).
The data from 4 participants were excluded (one due to scanner malfunction and 3 due to excessive head movement).
Since all patients were scanned on the same scanner within sites, there was no effect on SUVmax due to scanners employed.
The eastward wind velocities of FP04 were not available due to an error of the sky scanner.
In another case, images may be below quality thresholds due to systematic scanner-related errors (e.g., offset in color temperature due to deteriorated scanner light bulbs).
"These incidents were due to human error.
