CT-Guided Target Definition and Planning for Breast Cancer Radiotherapy
Author Information
Author(s): van der Laan Hans Paul, Dolsma Wil V, Maduro John H, Korevaar Erik W, Langendijk Johannes A
Primary Institution: University Medical Center Groningen/University of Groningen
Hypothesis
The study aims to compare the dosimetric consequences of CT-guided target definition and planning versus conventional methods in breast conserving radiotherapy.
Conclusion
CT-guided target definition and planning improves target coverage but increases the dose to surrounding organs at risk.
Supporting Evidence
- CT-based planning improved target coverage for breast PTVCT to 99.2%.
- Conventional treatment plans achieved adequate coverage in only 72% of patients.
- 3D-conformal treatment plans showed significantly less volume outside the breast PTVCT receiving the prescribed dose.
Takeaway
This study shows that using advanced imaging helps doctors better target breast cancer during treatment, but it can also expose nearby organs to more radiation.
Methodology
Twenty-five patients with left-sided breast cancer underwent CT-guided target definition and 3D-conformal dose-planning, with comparisons made to conventional treatment plans.
Potential Biases
Potential interobserver variability in target volume delineation may affect results.
Limitations
The study does not address the long-term clinical outcomes of the increased dose to organs at risk.
Participant Demographics
Patients were early-stage left-sided breast cancer patients who underwent radiotherapy after breast-conserving surgery.
Statistical Information
P-Value
< 0.001
Confidence Interval
99.2 (97.7 – 100.0) for breast PTVCT coverage
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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