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Contrast-enhanced CT를 이용한 방사선치료계획에서의 MU 계산 변화

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Affiliated Author(s)
오영기김진희김옥배최태진
Alternative Author(s)
Oh, Young KeeKim, Jin HeeKim, Ok BaeChoi, Tae Jin
Journal Title
Keimyung Medical Journal
Issued Date
2010
Keyword
Contrast mediumCTMonitor unitRadiation treatment planning
Abstract
To use contrast-enhanced CT is more effective in the calculation of radiation dose from RTP(radiation therapy planning) if the results of dose calculation is not significantly different with non-enhanced CT. In this study, we investigated the usefulness of contrast-enhanced CT to calculate the radiation dose in the RTP from quantitative comparison with the calculation results of the non-enhanced CT. The calculation of radiation dose and MU (monitor unit) was carried out for selected 3-5 patients treated by 3D CRT (3-dimensional conformal radiation therapy) from separated subparts of brain, head and neck, breast, lung, liver, and pelvis, respectively. The method and algorithm for calculation of radiation dose and MU were SAD (source-to-axis distance) technique and convolution-superposition method. The isodose curves of radiation dose were normalized to
100% at the isocenter and MU for prescription dose was calculated at the same point. The difference from the isodose lines could not be distinguished quantitatively for most of all patients of each subpart. The result of MU calculation based contrast-enhanced CT in the brain case were slightly increased to about 0.3% from results of non-enhanced CT. It was calculated to about 0.8%-increase in the liver, and about 0.6% in the pelvis. But it was decreased to about 0.8% in the head and neck, about 1.0% in the lung, and about 0.8% in the breast. Especially, in one breast patient the result was greatly decreased to 2.4%. These results were shown that the difference of MU by the use of contrast medium is not significant, but the change of SSD (sourceto-surface distance) from the patient motion or respiration effect have affect on the MU
calculation.
Alternative Title
Difference of the MU Calculation from RTP System Using the Contrast-enhanced CT
Department
Dept. of Medical Biophysics Engineering (의공학과)
Dept. of Radiation Oncology (방사선종양학)
Publisher
Keimyung University School of Medicine
Citation
오영기 et al. (2010). Contrast-enhanced CT를 이용한 방사선치료계획에서의 MU 계산 변화. Keimyung Medical Journal, 29(2), 120–128.
Type
Article
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/15504
Appears in Collections:
2. Keimyung Medical Journal (계명의대 학술지) > 2010
1. School of Medicine (의과대학) > Dept. of Medical Biophysics Engineering (의공학과)
1. School of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학)
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