A simplified intensity modulated radiation therapy technique for the breast

Area of Science:

• Radiation Oncology
• Medical Physics

Background:

• Achieving uniform radiation dose distribution in breast cancer treatment is crucial for efficacy and minimizing side effects.
• Standard techniques may lead to dose inhomogeneities and increased exposure to organs at risk.

Purpose of the Study:

• To present and evaluate a simplified intensity modulated radiation therapy (sIMRT) technique for breast cancer.
• To assess the dosimetric advantages and efficiency of sIMRT compared to standard and volume-based IMRT techniques.

Main Methods:

• Developed an sIMRT technique using standard tangential beams and inverse intensity modulation based on open field dose calculations.
• Planned 15 breast cancer patients using sIMRT, standard wedged pair, and volume-based IMRT (vIMRT) techniques.
• Compared dose distribution uniformity and organ-at-risk doses (heart, lung, contralateral breast).

Main Results:

• sIMRT achieved significantly more homogeneous dose distribution in the breast treatment volume compared to the standard technique.
• Both sIMRT and vIMRT reduced doses to the heart, ipsilateral lung, and contralateral breast.
• sIMRT demonstrated comparable planning and treatment times to the standard technique, and significantly shorter times than vIMRT.

Conclusions:

• The sIMRT technique provides a practical and efficient method for achieving uniform breast dose distribution.
• sIMRT offers dosimetric benefits comparable to vIMRT with improved efficiency, making it suitable for widespread clinical adoption.