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. 2013 May 6;14(3):99–112. doi: 10.1120/jacmp.v14i3.4203

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© 2013 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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Comparison (a) of planning CT scan (left) and CBCT scan (right) with prostate (CTV2 – yellow line, PTV2 – red line, 1 cm margin) and rectum (brown line) delineated; isocentric transversal slice. Color wash is set to 95% of the dose prescribed to prostate. Using BL‐based alignment, excessive rectal volume causes the prostate movement anteriorly, which leads in prostate underdosage. Lower image quality (b) of CBCT (right) comparing to planning CT (left). Prostate (yellow line), seminal vesicles (orange line), rectum (brown line), and bladder (blue line) are shown in transversal view (upper part) and sagittal view (lower part).