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Figure 1 – Rectal position has been found to vary two to three times greater than previously predicted during prostate radiotherapy. Shown above are axial slices at the same level from two patients: (a) and (c) show the anatomy on the kilovoltage (kV) scans used for planning prior to treatment, (b) and (d) show megavoltage (MV) images acquired during treatment displaying positional and loading differences. Images courtesy of Scaife, J., et al., Br J Radiol, 2014; 87: 20140343

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