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Interfractional diaphragm changes during breath-holding in stereotactic body radiotherapy for liver cancer.
Kawahara, Daisuke; Ozawa, Shuichi; Nakashima, Takeo; Tsuda, Shintaro; Ochi, Yusuke; Okumura, Takuro; Masuda, Hirokazu; Hioki, Kazunari; Suzuki, Tathsuhiko; Ohno, Yoshimi; Kimura, Tomoki; Murakami, Yuji; Nagata, Yasushi.
Afiliación
  • Kawahara D; Section of Radiation Therapy, Department of Clinical Support, Hiroshima University Hospital, Japan.
  • Ozawa S; Course of Medical and Dental Sciences, Graduate School of Biomedical & Health Sciences, Hiroshima University, Japan.
  • Nakashima T; Department of Radiation Oncology, Institute of Biomedical & Health Sciences, Hiroshima University, Japan.
  • Tsuda S; Section of Radiation Therapy, Department of Clinical Support, Hiroshima University Hospital, Japan.
  • Ochi Y; Section of Radiation Therapy, Department of Clinical Support, Hiroshima University Hospital, Japan.
  • Okumura T; Section of Radiation Therapy, Department of Clinical Support, Hiroshima University Hospital, Japan.
  • Masuda H; Section of Radiation Therapy, Department of Clinical Support, Hiroshima University Hospital, Japan.
  • Hioki K; Section of Radiation Therapy, Department of Clinical Support, Hiroshima University Hospital, Japan.
  • Suzuki T; Section of Radiation Therapy, Department of Clinical Support, Hiroshima University Hospital, Japan.
  • Ohno Y; Course of Medical and Dental Sciences, Graduate School of Biomedical & Health Sciences, Hiroshima University, Japan.
  • Kimura T; Section of Radiation Therapy, Department of Clinical Support, Hiroshima University Hospital, Japan.
  • Murakami Y; Department of Radiation Oncology, Institute of Biomedical & Health Sciences, Hiroshima University, Japan.
  • Nagata Y; Department of Radiation Oncology, Institute of Biomedical & Health Sciences, Hiroshima University, Japan.
Rep Pract Oncol Radiother ; 23(2): 84-90, 2018.
Article en En | MEDLINE | ID: mdl-29463958
AIM AND BACKGROUND: IGRT based on bone matching may produce a large target positioning error in terms of the reproducibility of expiration breath-holding on SBRT for liver cancer. We evaluated the intrafractional and interfractional errors using the diaphragm position at the end of expiration by utilising Abches and analysed the factor of the interfractional error. MATERIALS AND METHODS: Intrafractional and interfractional errors were measured using a couple of frontal kV images, planning computed tomography (pCT) and daily cone-beam computed tomography (CBCT). Moreover, max-min diaphragm position within daily CBCT image sets with respect to pCT and the maximum value of diaphragm position difference between CBCT and pCT were calculated. RESULTS: The mean ± SD (standard deviation) of the intra-fraction diaphragm position variation in the frontal kV images was 1.0 ± 0.7 mm in the C-C direction. The inter-fractional diaphragm changes were 0.4 ± 4.6 mm in the C-C direction, 1.4 ± 2.2 mm in the A-P direction, and -0.6 ± 1.8 mm in the L-R direction. There were no significant differences between the maximum value of the max-min diaphragm position within daily CBCT image sets with respect to pCT and the maximum value of diaphragm position difference between CBCT and pCT. CONCLUSIONS: Residual intrafractional variability of diaphragm position is minimal, but large interfractional diaphragm changes were observed. There was a small effect in the patient condition difference between pCT and CBCT. The impact of the difference in daily breath-holds on the interfractional diaphragm position was large or the difference in daily breath-holding heavily influenced the interfractional diaphragm change.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Rep Pract Oncol Radiother Año: 2018 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Polonia
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Rep Pract Oncol Radiother Año: 2018 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Polonia