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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
  1. *In-plane ROI diameter—2.3 cm; slice thickness—0.3 cm