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. 2017 Jul 12;62(15):6062–6073. doi: 10.1088/1361-6560/aa76aa

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© 2017 Institute of Physics and Engineering in Medicine

Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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Figure 1. — Box-and-whisker plots showing the effect, for a randomly selected patient, of different types of transformation on: (left) conformity index and (right) distance between centres. The transformations used are: (A) affine, (B) affine plus B-spline, (C) radiographer couch shifts, (D) radiographer couch shifts plus B-spline, (E) translations plus rotations, (F) translations plus rotations plus B-spline, (G) translation, (H) translation plus B-spline. Results for each transformation include: the mean (black square), the median (red line), first and third quartiles (respectively the bottom and the top of the blue box), and the lowest and highest values (respectively the bottom and top of the whiskers).