Physical and Histopathological Assessment of the Effects of Metallic Stents on Radiation Therapy
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- TSUJI Yoshihiko
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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- YOSHIMURA Hitoshi
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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- UTO Fumiaki
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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- TAMADA Toshiaki
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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- IWATA Kazuro
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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- TAMAMOTO Tetsuro
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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- ASAKAWA Isao
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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- SHINKAI Takayuki
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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- KICHIKAWA Kimihiko
- Departments of Radiology, Nara Medical University School of Medicine
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- HASEGAWA Masatoshi
- Departments of Radiation Oncology, Nara Medical University School of Medicine
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To evaluate whether simultaneous metallic stent (MS) placement and radiotherapy are feasible, phantom and animal experiments were performed. The interface dose by external irradiation (EI) or intracavity irradiation (II) to 5 kinds of MS was measured using the charge-coupled device (CCD) camera with a thermoluminescent (TL) sheet, and backscatter and absorption were evaluated using composite method. Lineac 10 MV X-ray irradiated the MS in close contact with the TL sheet. II was performed using 192Ir, and the irradiation dose transmitted through the MS was measured using the TL sheet. The ratio of the CCD value of the MS wire region to that of the MS non-wire region was defined as the dose perturbation factor (DPF). Furthermore, the effects of a combination of 60Co gamma-ray EI and MS placement in the normal common bile duct were histopathologically evaluated in dogs. In the phantom experiments of EI, in backscatter by the MS, the DPF was 1.09 for CZ, and 1.03 for Pal, but no backscatter was detected in the remaining 3 MS. In absorption by the MS, the DPF was 0.92, 0.97, 0.97, and 0.98 for CZ, Wall, Pal, and Vel, respectively, but no absorption was detected in U. Flex. In those of II, the DPF of absorption was 0.91, 0.98, and 0.98 for CZ, U. Flex, and Wall, respectively, but no absorption was detected in Pal and Vel. The animal experiments showed infiltration of inflammatory cells and fibrosis in the case of both MS placement and EI. These changes were marked in EI treating after MS placement, but neither severe ulcer nor perforation was found. In conclusion, these results suggested that the effect of MS should be considered carefully when simultaneous MS placement and EI is performed clinically.<br>
収録刊行物
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- Journal of Radiation Research
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Journal of Radiation Research 48 (6), 477-483, 2007
Journal of Radiation Research 編集委員会
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詳細情報 詳細情報について
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- CRID
- 1390282680194349824
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- NII論文ID
- 110006452330
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- NII書誌ID
- AA00705792
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- ISSN
- 13499157
- 04493060
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- NDL書誌ID
- 9256518
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可