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Leila Shelley

Leila Shelley

 
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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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Figure 2 – Dose surface maps of the rectum during prostate radiotherapy, generated from the original kilovoltage planning scan (left) and megavoltage on-treatment image (right). Differences in high- (red) and intermediate- (yellow) dose regions can be attributed to anatomical positional variation and have previously been linked to toxicity effects. The additional information provided by this novel on-treatment imaging and analysis technique will allow improved correlation between accumulated dose and patient reported side-effects. Images courtesy of Dr Simon Thomas, Head of Medical Physics and Clinical Engineering, Addenbrooke’s Hospital, Cambridge University Hospitals.