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Three-field isocentric technique for breast irradiation using individualized shielding blocks
G Conte1, O Nascimben, G Turcato
1Divisione di Radioterapia Oncologica, Oncologica Ospedale Umberto I, Mestre, Italy.
Summary
This study simplifies the three-field technique for breast cancer radiation therapy, reducing setup time and mechanical complexity while maintaining accuracy for improved patient care.
Area of Science:
- Radiation Oncology
- Medical Physics
Background:
- The three-field technique is standard for breast and regional node irradiation post-conservative surgery.
- Existing variants present complex geometrical challenges.
Purpose of the Study:
- To propose a simplified three-field technique for breast and regional node irradiation.
- To introduce individualized shielding blocks for simultaneous half-beam and critical area shielding.
Main Methods:
- Development of a simplified three-field technique using individualized shielding blocks.
- Verification of technique accuracy using photographic methods and thermoluminescent dosimetry.
- Maintained isocentric technique advantages while minimizing mechanical movements (collimator/couch rotations).
Main Results:
- The proposed technique simplifies patient setup, significantly reducing setup time.
- Simultaneous shielding of half beam and critical areas is achieved.
- Accuracy was confirmed through photographic and dosimetry measurements.
Conclusions:
- The simplified three-field technique offers an efficient and accurate method for breast and regional node irradiation.
- This approach reduces complexity and patient setup time without compromising treatment accuracy.