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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. 5.

Fig. 5

Contrast-to-noise ratio (CNR) for the different materials with increasing density inserts scanned with CBCT and CT. The error bars indicate deviations observed during the 16-month period (10 measurements each for 6–7 weeks for each device). Protocols used for the CT, CBCT at linac and simulator were head protocol, high-quality protocol without bow-tie filter (D) and the head protocol.