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Alopecia associated with unexpected leakage from electron cone
B C Wen1, E C Pennington, D H Hussey
1Department of Radiology, University of Iowa College of Medicine, Iowa City 52242.
Summary
Unexpected electron beam leakage during radiation therapy caused excessive patient irradiation. Highest leakage (40%) occurred with a 12 MeV beam and 6x6 cm cone, necessitating careful patient positioning to avoid side scatter regions.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Electron beam therapy is a crucial modality in radiation oncology.
- Ensuring accurate radiation delivery and minimizing dose to unintended areas is paramount for patient safety.
Observation:
- A patient undergoing electron beam therapy experienced unexpected excessive irradiation due to radiation leakage.
- An analysis was conducted to identify the cause and quantify the leakage under various conditions.
Findings:
- The highest radiation leakage was observed with a 12 MeV electron beam utilizing a 6 x 6 cm cone.
- Leakage dose measurements along the side of the cone reached up to 40% of the prescribed dose.
- Leakage varied with different electron beam energies and cone sizes.
Implications:
- Current cone designs may contribute to significant radiation leakage.
- Immediate clinical practice adjustments are required, including careful review of patient setups to avoid irradiating unintended areas.
- Redesign or modification of treatment cones is recommended to mitigate future leakage risks and enhance patient safety.