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Published on: April 11, 2018
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A semi-automatic planning technique for whole breast irradiation with tangential IMRT fields
L Marrazzo1, L Redapi1, M Zani1
1AOU Careggi, Medical Physic Unit, Florence, Italy.
Summary
A new automated intensity-modulated radiation therapy (IMRT) technique improves breast cancer treatment planning. This automated intensity-modulated radiation therapy (IMRT) significantly reduces planning time while enhancing target coverage and dose homogeneity.
Area of Science:
- Radiation Oncology
- Medical Physics
- Cancer Treatment
Background:
- Conventional 3D conformal radiation therapy (3DCRT) for breast cancer involves complex manual planning.
- Intensity-modulated radiation therapy (IMRT) offers potential for improved dose distribution but requires sophisticated planning.
- Automated planning tools can streamline IMRT implementation in clinical practice.
Purpose of the Study:
- To implement and evaluate a semi-automatic planning technique for whole breast irradiation using tangential IMRT fields.
- To compare the dosimetric quality and robustness of the automated IMRT (autoIMRT) plans against standard 3DCRT plans.
- To assess the feasibility of introducing autoIMRT into routine clinical practice for breast cancer patients.
Main Methods:
- Utilized the Auto-Planning module of the Pinnacle3 treatment planning system to generate autoIMRT techniques for breast cancer patients.
- Evaluated autoIMRT plans against clinical 3DCRT plans based on key dosimetric parameters.
- Assessed plan robustness by simulating isocenter shifts and analyzing the impact on target coverage and organ-at-risk doses.
Main Results:
- AutoIMRT demonstrated statistically significant improvements in target coverage and dose homogeneity compared to 3DCRT.
- No significant differences in ipsilateral organ doses were observed, except for a slight reduction in mean dose and V18% for the ipsilateral lung in left DIBH.
- AutoIMRT plans exhibited comparable robustness to 3DCRT against isocenter displacements, with minimal decrease in CTV coverage.
- Average planning time was drastically reduced from 40 minutes for 3DCRT to 6 minutes for autoIMRT.
Conclusions:
- The developed autoIMRT technique is effective for whole breast irradiation, offering superior target coverage and homogeneity.
- AutoIMRT plans are robust against patient positioning uncertainties, ensuring reliable treatment delivery.
- Automated planning significantly reduces workload and improves overall plan quality, supporting its clinical adoption.
