Effects of Setup Errors on Dose Distribution in Hypofractionated Radiotherapy for Left-Sided Radical Breast Cancer
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By
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Pan Wang
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Guofeng Ma
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Ting Zhao
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Wei Ding
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Wei Kong
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Hongqiang Ye
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Jun Shang
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Wanfu Yang
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April 24, 2026
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Clinical Scorecard: Effects of Setup Errors on Dose Distribution in Hypofractionated Radiotherapy for Left-Sided Radical Breast Cancer
At a Glance
| Category | Detail |
|---|
| Condition | Left-Sided Radical Breast Cancer |
| Key Mechanisms | Impact of setup errors on dose distribution to targets and organs at risk (OARs) during hypofractionated radiotherapy. |
| Target Population | Patients undergoing radical mastectomy for left-sided breast cancer. |
| Care Setting | Radiotherapy department in a clinical hospital. |
Key Highlights
- Setup errors significantly affect dose distribution to clinical target volumes (CTVsc and CTVcw).
- Esophagus and thyroid are most sensitive to setup errors in the right direction.
- Heart and LAD are most sensitive to errors in the posterior direction.
- Recommended setup error tolerance is 3 mm for CTVcw and OARs, and 5 mm for CTVsc.
- Increased positioning errors lead to significant dose increases in OARs.
Guideline-Based Recommendations
Diagnosis
- Assess positioning uncertainties in patients undergoing hypofractionated radiotherapy.
Management
- Implement imaging guidance strategies to minimize setup errors.
Monitoring & Follow-up
- Regularly evaluate dose distribution to targets and OARs during treatment.
Risks
- Increased risk of radiation exposure to OARs and potential complications.
Patient & Prescribing Data
30 patients with left-sided breast cancer post-radical mastectomy.
Prescribed with 43.5 Gy in 15 fractions; setup errors simulated to analyze dosimetry.
Clinical Best Practices
- Maintain strict adherence to positioning protocols to minimize setup errors.
- Utilize advanced imaging techniques to monitor patient positioning.
- Educate patients on the importance of immobilization during treatment.
References
