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Abstract
Background/aim: The purpose of this study was to determine whether a semi-cylindrical beam spoiler (sCBS) developed herein effectively increases the skin dose in patients with early-stage glottic cancer.

Patients and methods: We measured the surface doses for 26 patients who used the sCBS during treatment of early-stage glottic cancer through a parallel-opposed lateral two-field 6 MV photon beam. Measurements were performed by attaching optically stimulated luminescent dosimeters to the left, right, anterior (in-field), inferior, and superior (out-field) sides of the patient.

Results: The measured results were 81.8±2.1% (left), 81.0±1.7% (right), and 76.8±2.7% (anterior) in the in-field region compared to prescription doses, with 5.7±1.7% (superior) and 2.7±0.7% (inferior) in the out-field region.

Conclusion: sCBS can deliver a suitably ideal surface dose for treatment of early-stage glottic cancer.

Affiliations

Dong Hyeok Choi  1 , So Hyun Ahn #  2 , Woo Sang Ahn #  3 , Seong Soo Shin  4 , Jin Sung Kim  5
1 Department of Medicine, Yonsei University, Seoul, Republic of Korea.
2 Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea; anidol@ulsan.ac.kr mpsohyun@gmail.com.
3 Department of Radiation Oncology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Republic of Korea anidol@ulsan.ac.kr mpsohyun@gmail.com.
4 Department of Radiation Oncology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Republic of Korea.
5 Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea.
# Contributed equally.