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Evaluating QUANTEC Small Bowel Dose-Volume Guidelines for Rectal Cancer Patients Treated Using a Couch Top Inclined
Vijayananda Kundapur1, Gavin Cranmer-Sargison2, Haresh Vachhrajani1
1Saskatoon Cancer Centre, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
Summary
Using an inclined belly board (iBB) for rectal cancer patients ensures small bowel (SB) dose-volume limits are met. This technique provides consistent SB displacement during radiation therapy.
Area of Science:
- Radiation Oncology
- Medical Physics
Background:
- Rectal cancer treatment often involves radiation therapy, posing a risk of small bowel (SB) radiation exposure.
- Quantitative Analyses of Normal Tissue Effects in the Clinic (QUANTEC) provides guidelines for acceptable dose-volume limits to minimize SB toxicity.
- The inclined belly board (iBB) is a positioning device designed to improve treatment accuracy and potentially reduce organ-at-risk dose.
Purpose of the Study:
- To analyze small bowel (SB) dose-volume metrics in rectal cancer patients treated with an inclined belly board (iBB).
- To evaluate the consistency of SB displacement during treatment using cone-beam computed tomography (CBCT).
- To assess adherence to QUANTEC guidelines for SB dose-volume parameters.
Main Methods:
- Twenty-four rectal cancer patients undergoing radiochemotherapy on an iBB were studied.
- Weekly CBCT imaging was performed to assess SB displacement reproducibility.
- SB dose-volume data were analyzed and compared against QUANTEC recommendations.
- The influence of body mass index (BMI) on SB displacement and dose-volume was investigated.
Main Results:
- Radiation oncologists rated SB displacement as "good" to "very good".
- SB displacement consistency was rated "excellent" in 22-23 out of 24 patients.
- All patients met QUANTEC recommendations for SB dose-volume, particularly those with BMI > 23 kg/m².
Conclusions:
- The inclined belly board (iBB) facilitates easy adherence to QUANTEC SB dose-volume recommendations in rectal cancer radiotherapy.
- The iBB technique demonstrates robustness and achieves consistent SB displacement during treatment.
Keywords:
Quantitative Analyses of Normal Tissue Effects in the ClinicRectal cancerinclined belly boardsmall bowelMore Related Videos
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