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http://dx.doi.org/10.5762/KAIS.2014.15.6.3734

Neutron dosimetry depending on the number of portals for prostate cancer IMRT(Intensity-Modulated Radiation Therapy)  

Lee, Joo-Ah (Department of Radiation Oncology, Catholic University, Incheon St.Mary's Hospital)
Son, Soon-Yong (Department of Radiology, Asan Medical Center)
Min, Jung-Whan (Department of Radiology, Shin-Gu University)
Choi, Kwan-Woo (Department of Radiology, Asan Medical Center)
Na, Sa-Ra (Department of Radiology, Asan Medical Center)
Jeong, Hoi-Woun (Department of Radiology, Baekseok Culture University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.15, no.6, 2014 , pp. 3734-3740 More about this Journal
Abstract
The aim of this study was provide basic information and establish the criteria in radiation therapy planning by measuring the absorbed neutron dose of normal tissues and lesions according to the number of portals. From September 2013 to January 2014, 20 patients who were diagnosed with prostate cancer and were previously treated with radiation therapy were replanned retrospectively to measure the absorbed neutron dose distribution according to the number of portals. The absorbed neutron dose was measured in each of the 5, 7 and 9 portals using a 15 MV energy, which meant a therapeutic dose of 220 cGy. The optical stimulation luminescence dosimeter was separated by 20cm and 60cm away from the center of the field of view. As a result, the average radiation dose in the abdomen appeared to have a positive relationship with the number of portals, which was statistically significant (p<.05). The average radiation dose was $4.34{\pm}1.08$. The average radiation dose in the thyroid was $2.71{\pm}.37$. Although it showed a positive relationship with the number of portals, it did not have statistical significance. The number of portals and the neutron dose depending on the position showed a significant positive relationship, particularly in the abdomen. As a result of linear regression analysis, as the number of the portal increased in steps, the average volume of the neutrons increased significantly (0.416 times). In conclusion, efficient selection of the number of portals is needed considering the difference in the absorbed neutron dose in the normal tissues depending on the number of the portals.
Keywords
IMRT; OSLD; Photonuclear reaction; Number of portal; MU;
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Times Cited By KSCI : 3  (Citation Analysis)
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