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. 2019 Oct 8;20(10):172–180. doi: 10.1002/acm2.12734

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© 2019 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Signal to noise ratio (SNR) and contrast to noise ratio (CNR) using fixed 22.86 cm polymethyl methacrylate (PMMA) slabs with different fluoro dose levels. Note the change in both SNR and CNR for low and high dose fluoro modes where the dose is lower or higher than the normal fluoro dose setting. From the low to norm setting, the dose rate increased 5 mGy/min, however the kVp decreased by 3, and the copper spectral filter decreased 0.6 mm, indicating that the beam quality was significantly higher for the low fluoro setting compared to the normal setting, which reduced the SNR from low to norm at this elevated thickness of PMMA.