Ratio of ROI Values (OSEM/FBP) for Interval 45–60 Minutes of FDG Scan
| Tissue | ROI | 2 × 12 | 4 × 16 | G5 | |
|---|---|---|---|---|---|
| 2 × 12 | 4 × 16 | ||||
| Myocardium | Short axis, template ROI | 1.10 | 1.08 | 1.08 | 1.05 |
| Axial slices, isocontour ROI | 1.13 | 1.21 | 1.01 | 1.02 | |
| Tumor | 2.5- to 5-cm diameter | 1.14 | — | 0.99 | — |
| Brain | Gray matter | 0.98 | 1.04 | 0.94 | 0.99 |
G5 = with smoothing.
Data are given for OSEM 2 × 12, 4 × 16 with and without 5-mm FWHM Gaussian smoothing of reconstructed image. Uncertainty of these ratios is 2% (1 SD) or less.