Repositioning accuracy of a novel thermoplastic mask for head and neck cancer radiotherapy |
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| Affiliation: | 1. Department of Medical Technology, Osaka University Hospital, 2-15, Yamadaoka, Suita, Osaka 565-0871, Japan;2. Oncology Center, Osaka University Hospital, 2-2 (D10), Yamadaoka, Suita, Osaka 565-0871, Japan;3. Department of Nursing, Osaka University Hospital, 2-15, Yamadaoka, Suita, Osaka 565-0871, Japan;4. Department of Radiation Oncology, Osaka University Graduate School of Medicine, 2-2 (D10), Yamadaoka, Suita, Osaka 565-0871, Japan;1. Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada;2. Department of Radiation Oncology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada;1. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan;2. Interdisciplinary Program for Biomedical Sciences, Institute for Academic Initiatives, Osaka University, 1-1 Yamadaoka, Suita, Osaka 565-0871, Japan;1. Centre for Medical Psychology & Evidence-Based Decision-Making School of Psychology, University of Sydney, Sydney, New South Wales, Australia;2. Psycho-Oncology Cooperative Research Group, University of Sydney, Sydney, New South Wales, Australia;3. Radiation Oncology Network, Western Sydney Local Health District, Sydney, New South Wales, Australia;4. Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia;1. Department of Biomedical Sciences, University of South Alabama, Mobile, Alabama, USA;2. Department of Radiologic Sciences, University of South Alabama, Mobile, Alabama, USA;3. Department of Biomedical Sciences (Retired), University of South Alabama, Mobile, Alabama, USA;4. Division of Infectious Diseases, Department of Internal Medicine, University of South Alabama, Mobile, Alabama, USA;1. Department of Radiation Oncology, Rhode Island Hospital, Brown University, Providence, RI;2. Department of Radiation Oncology, Tufts Medical Center, Tufts University, Boston, MA |
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| Abstract: | PurposeThe aim of this study was to assess the reproducibility of patient shoulder position immobilized with a novel and innovative prototype mask (E-Frame, Engineering System).MethodsThe E-frame mask fixes both shoulders and bisaxillary regions compared with that of a commercial mask (Type-S, CIVCO). Thirteen and twelve patients were immobilized with the Type-S and E-Frame mask systems, respectively. For each treatment fraction, cone-beam CT (CBCT) images of the patient were acquired and retrospectively analyzed. The CBCT images were registered to the planning CT based on the cervical spine, and then the displacements of the acromial extremity of the clavicle were measured.ResultsThe systematic and random errors between the two mask systems were evaluated. The differences of the systematic errors between the two mask systems were not statistically significant. The mean random errors in the three directions (AP, SI and LR) were 2.7 mm, 3.1 mm and 1.5 mm, respectively for the Type-S mask, and 2.8 mm 2.5 mm and 1.4 mm, respectively for the E-Frame mask. The random error of the E-Frame masks in the SI direction was significantly smaller than that of the Type-S. The number of cases showing displacements exceeding 10 mm in the SI direction for at least one fraction was eight (61% of 13 cases) and three (25% of 12 cases) for Type-S and E-Frame masks, respectively.ConclusionsThe E-Frame masks reduced the random displacements of patient’s shoulders in the SI direction, effectively preventing large shoulder shifts that occurred frequently with Type-S masks. |
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