한국의학물리학회:학술대회논문집 (Proceedings of the Korean Society of Medical Physics Conference)

한국의학물리학회 (Korean Society of Medical Physics)
권호 표지

Spinal Cord Partial Block Technique Using Dynamic MLC

  • Cho, Sam-Ju (Dept. of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsanm Dept. of Medical Physics, Kyonggi Univ.) ;
  • Yi, Byong-Yong (Dept. of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan) ;
  • Back, Geum-Mun (Dept. of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan) ;
  • Lee, Sang wook (Dept. of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan) ;
  • Ahn, Seung-Do (Dept. of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan) ;
  • Kim, Jong-Hoon (Dept. of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan) ;
  • Kwon, Soo-Il (Dept. of Medical Physics, Kyonggi Univ.) ;
  • Park, Eun-Kyung (Dept. of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan)
  • 발행 : 2002.09.01
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초록

The spinal cord dose is the one of the limiting factor for the radiation treatment of the head & neck (H&N) or the thorax region. Due to the fact that the cord is the elongated shaped structure, it is not an easy task to maintain the cord dose within the clinically acceptable dose range. To overcome this problem, the spinal cord partial block technique (PBT) with the dynamic Multi-Leaf Collimator (dMLC) has been developed. Three dimension (3D) conformal beam directions, which minimize the coverage of the normal organs such as the lung and the parotid gland, were chosen. The PBT field shape for each field was designed to shield the spinal cord with the dMLC. The transmission factors were determined by the forward calculation method. The plan comparisons between the conventional 3D conformal therapy plan and the PTB plan were performed to evaluate the validity of this technique. The conformity index (CI) and the dose volume histogram (DVH) were used as the plan comparison indices. A series of quality assurance (QA) was performed to guarantee the reliable treatment. The QA consisted of the film dosimetry for the verification of the dose distribution and the point measurements. The PBT plan always generated better results than the conventional 3D conformal plan. The PBT was proved to be useful for the H&N and thorax region.

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