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RISS 인기검색어
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- 저자 : Yu To-Sol (검색결과 2 건)
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Han Moo-Jae,Yang Seung-Woo,Shin Yo-Han,Bae Sang-Il,Moon Young-Min,Jeon Wan,Yu To-Sol,Kang Jin-Kyu,Kim Jin-Young,Heo Seung-Uk,박성광,나정은,Chung Jin Beom 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.11
During radiotherapy, some patients owing to the variability in skin sensitivities, may experience adverse skin reactions for doses at which other patients are asymptomatic. Hence, when abnormal symptoms appear on a patient's skin, the etiology should be verified. Accordingly, a surface dosimeter on the skin can help ascertain whether accurate doses are irradiated. Furthermore, surface doses are measured in the field junction gaps during craniospinal irradiation or during large-area radiotherapy to avoid adverse reactions due to cumulative skin doses from multiple beams. However, the point dose measurement errors of surface dosimeters exceed approximately 10% and have low-positional accuracies because the attachment sites are approximated with the help of the naked eye. Moreover, accurate information on field junction gaps cannot be obtained. Therefore, in clinical practice, a flexible array dosimeter is required as it can measure the dose distribution on the body surface by adapting its shape to the body curvatures. In this study, we implemented a flexible array dosimeter and, based on its constituent materials, evaluated the attenuation rate associated with its use. A polyester (PET) film was used as the underlying substrate. HgI2 and PbI2 photoconductors were used for their good performances in films. Furthermore, the measurement accuracy was verified through comparisons with Monte Carlo simulation outcomes. The resulting PET film had an attenuation rate of 2.22% at a 50-μm thickness. At the minimum material thickness of 25 μm, the attenuation rates for HgI2 and PbI2 were 4.69% and 5.72%, respectively. Further research is needed to fabricate HgI2-based digital skin dosimeters with a thickness under 25 μm. Radiation detection and pixel resolution should be evaluated to accurately confirm the field junction gap.
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Moon Young-Min,Kang Jin Kyu,Yu To-Sol,Jeon Wan,Choi Chul Won,Kim Jin Young,Chung Jin Beom,Kang Sang Won,Park Sung Kwang,Han Moo Jae,Yang Seung Woo 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.11
It has been shown that the detection of fat body surfaces (thorax, pelvis) using the three-dimensional optical surface imaging system (3D–OSIS) is less accurate than curved surfaces (head, neck). Here, we evaluated the applicability and technical performance of the 3D–OSIS for prone breast radiotherapy using silicon cup markers. Three silicon cups were attached on the dorsal surface of a female atom phantom. We evaluated the data reproducibility with these marker cups and compared the accuracy with or without their use. For the reproducibility test, we scanned an object 11 times every 15 s with the 3D– OSIS and registered the diferences. For the accuracy test, we positioned the phantom on the table and manually moved it in the X, Y, and Z directions to predetermined values. These values were compared to those measured with the 3D–OSIS. This process was repeated 21 times and the diferences of the measured values were compared according to the presence or absence of markers. In reproducibility test, the mean variations for the shifts in the lateral, longitudinal, and vertical directions were 0.15±0.22 mm, 0.47±0.13 mm, and 0.34±0.19 mm, respectively. And the mean deviations elicited based on the accuracy test for the manually applied and the measured shifts in the lateral, longitudinal, and vertical directions were (a) 0.23±0.1 mm, 0.044±0.39 mm, and 0.18±0.1 mm with the use of markers, and (b) 0.44±0.33 mm, 0.97±0.55 mm, and 0.63±0.55 mm without the markers, respectively. The use of silicon cup markers yielded highly accurate results in the 3D–OSIS. The use of 3D–OSIS and silicon cups has potential in achieving precise patient setup and in reducing the CBCT frequency in prone breast radiotherapy.
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