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. Author manuscript; available in PMC: 2010 May 11.
Published in final edited form as: Radiother Oncol. 2009 Aug 18;93(1):1–7. doi: 10.1016/j.radonc.2009.07.012

Fig. 6.

Fig. 6

Contrast-to-noise ratio (CNR) for the CBCT at the linac using different protocols and the bow-tie filter. The protocols used were: A – low-quality protocol; B – medium-quality protocol; C – medium-quality protocol with bow-tie filter; D – high-quality protocol; E – high-quality protocol with bow-tie filter. The error bars indicate the standard deviation for the three different locations of ROIs.