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. 2012 May 10;13(3):124–151. doi: 10.1120/jacmp.v13i3.3729

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© 2012 The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Localization accuracy of ETX and CBCT: (a) hidden target test error distribution on AP and LAT portal images (units in mm), (b) hidden target test error distribution of ETX with systematic offsets removed ( $μ \pm σ = 0.0 \pm 0.3 mm$ for L/R, $0.0 \pm 0.1 mm$ for P/A, and $0.1 \pm 0.2 mm$ for S/I), and (c) angular discrepancy between 3D/2D ETX and 3D/3D CBCT image registration algorithms (left) and robotic couch error estimated from 8 embedded BBs on 9 pairs of pre/ post CBCT images (right).