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Table 4 Evaluation of contrast-noise-ratio (CNR) with Catphan sensitometry module*

From: Implementation and experimental evaluation of Mega-voltage fan-beam CT using a linear accelerator

  Dose level 30 MU 60 MU
Insert #1 3.7 6.4
Insert #2 1.2 2.2
Insert #3 0.2 0.4
Insert #4 0.2 0.5
Insert #5 0.3 0.6
Insert #6 0.7 1.1
Insert #7 1.2 2.2
Insert #8 1.0 1.8
  1. *For CNR measurement at each insert, the in-plane ROIs were placed at the center of each insert and the immediate background region. ROI diameter—0.8 cm; slice thickness—0.3 cm. The inset illustrates the indices of inserts