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논문 기본 정보

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학술저널
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Delishaj, Durim (Department of Radiation Oncology, University Hospital Santa Chiara) Ursino, Stefano (Department of Radiation Oncology, University Hospital Santa Chiara) Pasqualetti, Francesco (Department of Radiation Oncology, University Hospital Santa Chiara) Matteucci, Fabrizio (Department of Radiation Oncology, University Hospital Santa Chiara) Cristaudo, Agostino (Department of Radiation Oncology, University Hospital Santa Chiara) Soatti, Carlo Pietro (Department of Radiation Oncology, "A. Manzoni" Hospital) Barcellini, Amelia (Radiotherapy Unit, IRCCS Istituto Nazionale dei Tumori) Paiar, Fabiola (Department of Radiation Oncology, University Hospital Santa Chiara)
저널정보
대한방사선종양학회 Radiation oncology journal : ROJ Radiation oncology journal : ROJ 제36권 제1호
발행연도
2018.1
수록면
54 - 62 (9page)

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Purpose: To investigate set-up errors, suggest the adequate planning target volume (PTV) margin and image-guided radiotherapy frequency in head and neck (H&N) cancer treated with intensity-modulated radiotherapy (IMRT) assessed by kV cone-beam computed tomography (CBCT). Methods: We analyzed 360 CBCTs in 60 patients with H&N cancer treated with IMRT. The target delineation was contoured according to ICRU62. PTVs were generated by adding a 3-5 mm margin in all directions to the respective clinical target volumes. The kV CBCT images were obtained at first three days of irradiation and weekly thereafter. The overall mean displacement, range, systematic (${\Sigma}$) and random (${\sigma}$) errors were calculated. Adequate PTV margins were calculated according to the van Herk formula ($2.5{\Sigma}+0.7r$). Results: The mean of set-up errors was less than 2 mm in any direction. The overall frequency of set-up displacements greater than 3 mm was 3.9% in medial-lateral (ML) direction, 8% in superior-inferior (SI) direction, and 15.5% in anterior-posterior (AP) direction. The range of translations shifts was 0-9 mm in ML direction, 0-5 mm in SI direction and 0-10 mm in AP direction, respectively. After systematic set-up errors correction, the adequate margin to overcome the problem of set-up errors was found to be less than 3 mm. Conclusion: Image-guided kV CBCT was effective for the evaluation of set-up accuracy in H&N cancer. The kV CBCT at first three fractions and followed-by weekly appears adequate for reducing significantly set-up errors in H&N cancer treated with IMRT technique. Finally, 3-5 mm PTV margins appear adequate and safe to overcome the problem of set-up errors.

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