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Irradiation Methods for Accurate Dose Delivery to Postoperative Keloid Scars With Minimal Normal Tissue Exposure

Katsuya Okuhata^1,2, Kenta Kijima³, Kenji Nakamura⁴

¹Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Osaka, Japan; katsu.ri.pu@gmail.com.

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Summary

The static beam of TomoTherapy offers safe and accurate dose delivery for ear keloid treatment. Helical photon beams effectively distribute low-dose exposure, minimizing risks during radiation therapy.

Keywords:

Delivery accuracy TomoTherapy customized bolus ear keloid normal tissue exposure

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Area of Science:

Radiation Oncology
Medical Physics

Background:

Postoperative ear keloids present a treatment challenge.
Accurate and targeted radiation delivery is crucial to minimize side effects.

Purpose of the Study:

To evaluate the TomoTherapy irradiation method for treating ear keloids.
To ensure accurate dose delivery while minimizing radiation exposure to surrounding tissues.

Main Methods:

An anthropomorphic phantom simulating the auricle and lobe was used.
Static and helical photon beams (TomoTherapy) and electron beams (Elekta synergy) were employed.
Radiochromic film and glass dosimeters measured surface, eyeball, and thyroid doses.

Main Results:

Ear surface doses were 97.9% (static), 103.0% (helical), and 91.7% (electron) of prescribed.
Thyroid doses were 0.6 cGy (static), 0.8 cGy (helical), and 2.4 cGy (electron).
Left eyeball doses were 3.3 cGy (static), 6.9 cGy (helical), and 2.7 cGy (electron).

Conclusions:

TomoTherapy's static beam is safe and effective for ear keloid treatment, ensuring target dose.
Helical photon beams from TomoTherapy help distribute low-dose exposure.
Radiation therapy planning requires careful consideration of beam modality and dose distribution.