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Bladder filling and bowel volume
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Full bladder versus empty bladder decreases
volume of bowel irradiated to a significant dose
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Avoid very large filling (>300ml)*
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Example drinking protocol:
450-500ml 1 hour prior to planning CT scan and to each
treatment
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Reproducibility of bladder filling?
Significant variation
Main purpose is to push bowel away!
*Eminowicz et al, Understanding the impact of pelvic organ motion on
dose delivered to target volumes during IMRT for cervical cancer.
Radiother Oncol 2017;122:116–21