Development of Novel Immobilization Adapter for Head and Neck Radiotherapy with Low-attenuation Material
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- Matsumoto Kenji
- Department of Radiology, Kindai University Hospital
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- Saika Takahiro
- Department of Radiology, Kindai University Hospital
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- Shimomura Kohei
- Kyoto College of Medical Science
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- Hanaoka Kohei
- Department of Radiology, Kindai University Hospital
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- Tamura Mikoto
- Department of Medical Physics, Graduate School of Medical Science, Kindai University
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- Monzen Hajime
- Department of Medical Physics, Graduate School of Medical Science, Kindai University
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- Hayakawa Masaru
- Toppan Printing Co., Ltd.
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- Okumura Masahiko
- Department of Radiology, Kindai University Hospital
Bibliographic Information
- Other Title
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- 低吸収素材を用いた頭頸部用枕固定支持台の開発
- 臨床技術 低吸収素材を用いた頭頸部用枕固定支持台の開発
- リンショウ ギジュツ テイキュウシュウ ソザイ オ モチイタ トウケイブヨウマクラ コテイ シジダイ ノ カイハツ
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Abstract
<p>Purpose: The dosimetric error due to immobilization devices has been highlighted by the AAPM Task Group 176. We developed a novel low-radiation-absorbent immobilization adaptor (HMA), which can be used with a Styrofoam headrest for head and neck region in radiotherapy. The purpose of this study was to investigate the impact of the HMA on the dose distribution and compare with a commercially released plastic adapter. Methods: Computed tomography (CT) simulation and dose calculation on a treatment planning system (TPS) were performed by the use of HMA and the plastic adapter with a cylindrical phantom. Both the adapters were placed on the phantom upside and the attenuation rate was measured. Gantry angles were changed at every 1°interval from 0°to 50°for measurements. The measured dose was normalized by the value of 90°. The treatment equipment was TrueBeam (Varian medical systems); X-ray energies were set on 4, 6 and 10 MV, respectively. The measured attenuation rates were also compared with calculation results of TPS. Results: The highest differences on attenuation rate of both the adapters were observed at a gantry angle of 32.0°; the differences were 3.0% at 4 MV, 2.7% at 6 MV and 3.0% at 10 MV, respectively, and lower absorption was HMA. TPS calculation results of monitor unit for the HMA were within 1.0% in each energy. Conclusion: The HMA was able to provide absorption dose and calculation errors lower than a commercially released adapter. It can also provide more accurate dose delivery for radiotherapy in head and neck because of the low absorption characteristics.</p>
Journal
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- Japanese Journal of Radiological Technology
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Japanese Journal of Radiological Technology 75 (2), 167-173, 2019
Japanese Society of Radiological Technology
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Details 詳細情報について
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- CRID
- 1390564238077056256
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- NII Article ID
- 130007601913
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- NII Book ID
- AN00197784
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- ISSN
- 18814883
- 03694305
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- NDL BIB ID
- 029539409
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- PubMed
- 30787223
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed
