Table 3 Evaluation of image uniformity with Catphan uniformity module: mean CT number ± standard error at each region-of-interest (ROI) *
From: Implementation and experimental evaluation of Mega-voltage fan-beam CT using a linear accelerator
Dose level | 30 MU | 60 MU |
|---|---|---|
Central ROI | 1.7 ± 2.0 HU | 0.6 ± 1.2 HU |
Peripheral ROI #1 | 1.5 ± 1.6 HU | − 1.0 ± 0.9 HU |
Peripheral ROI #2 | 1.3 ± 1.6 HU | − 0.2 ± 0.9 HU |
Peripheral ROI #3 | − 0.4 ± 1.5 HU | − 0.4 ± 1.0 HU |
Peripheral ROI #4 | − 1.4 ± 1.6 HU | − 1.1 ± 1.0 HU |