Table 2 Quantities for volume of interest (VOI) analysis
From: Multi institutional quantitative phantom study of yttrium-90 PET in PET/MRI: the MR-QUEST study
VOI and size | Measured quantity | Purpose |
|---|---|---|
Field of view (FOV) | Total activity (GBq) | Accuracy in total injected activity measurement |
Fillable spheres: 37, 28, 22, 17, 13, 10Â mm | Recovery coefficient of mean activity concentration (MBq/ml) | Accuracy in VOI measurements from partial volume effects |
Background spheres: 12 of 37-mm diameters | Recovery coefficient of mean activity concentration (MBq/ml) | Accuracy in warm background VOI measurements |
Background spheres: 12 each of 37-, 28-, 22-, 17-, 13-, 10-mm diameters | Standard deviation of mean activity concentration (MBq/ml) | Variability in warm background measurements (noise) |
Insert: 28-mm diameter, 160-mm length | Mean activity concentration (MBq/ml) | Background counts |