적층구조의 3차원 콜리메이터

3D Stacked Radiation Collimator

  • Yoon, Dok-Un (Department of Health Science, Radiologic Science, Korea University) ;
  • Lee, Tae-Woong (Department of Health Science, Radiologic Science, Korea University) ;
  • Lee, Won-Ho (Department of Health Science, Radiologic Science, Korea University)
  • 투고 : 2013.03.11
  • 심사 : 2013.06.07
  • 발행 : 2013.06.30

초록

2차원 방향으로 납을 이동하여 방사선 세기를 조절하는 기존의 다엽콜리메이터와는 다른 방식으로 고안 된 3차원 콜리메이터를 개발하였다. 3차원 콜리메이터는 복잡한 기하학적 구조에 방사선 조사에 있어 실시간으로 선량을 변화 할 수 있다. 3차원 콜리메이터는 정육면체 구조로 이를 구성하는 각각의 복셀화된 콜리메이터는 모터와 납으로 연결되어 있다. 각각의 프레임은 컴퓨터로 코딩된 FPGA 신호를 회로에 전달하여 계획대로 개별적으로 움직일 수 있다. 여러 가지 복잡한 기하학적 구조를 몬테칼로 시뮬레이션을 이용하여 결과를 도출하고 직접 실험한 결과를 비교 분석 하였다.

Multileaf collimators whose Pb leaves are moving in two-dimensional directions have been used. We propose a different concept three-dimensional (3D) collimator with 3D shape that is automatically changeable to modulate the radiation dose even for complex tumors in real time. A voxel collimator, including a hinged Pb plane and a 3D assembly of many voxel collimators, was used. In each frame rotation axis, a motor, which was controlled by a circuit with field-programmable gate array (FPGA) board connected with computer, was operated according to a predetermined plan. Simulations of that, which are generally used for planning, were performed and compared with experimental results.

키워드

참고문헌

  1. Eric E. Klein, Daniel A. Low, Jerry Markman, Mallinckrodt Institute of Radiology, St. Louis MO "Periodic Testing for Dynamic Multileaf Collimation" Proceedings of the 22"d Annual EMBS International Conference, Chicago IL, 23-28, 2000
  2. Gert 0. de Meerleer, Cristina M. T Defue, R.N. Luk Vakaet, Ludwig G. Fortan, M Sc., Bart K. G. Mersseman. "Execution of a Single-Isocenter TJBtEE-Field Technigue, using a Multileaf Collimator or Tray-Mounted Cerrobend Blocks- Effect on Treatment Time" Int. J. Radiation Oncology Biol. Phys.. 39(1), 255-259. 1997
  3. Brenda G. Clark, Tony Teke, Karl Otto "Penumbra evaluation of the varian millennium and BrainLAB M3 multileaf collimators" Int. J. Radiation Oncology Biol. Phys. 66(4), S71-S75, 2006
  4. Lijun Ma, A.L Boyer, C.-M Ma, L Xing "Synchronizing dynamic multileaf collimators for producing two-dimensional intensity-modulated fields with minimum beam delivery time " Int. J. Radiation Oncology Biol. Phys. 44(4), 1147-1154, 1999 https://doi.org/10.1016/S0360-3016(99)00121-2
  5. Matjaz Jeraj, Vlado Robar "Multileaf collimator in radiotherapy" Radiol Oncol 38(3), 235-240, 2004
  6. Andrew W Beavis, Paul S Ganney, Viv J Whitton and Lei Xing. "Optimisation of MLC orientation to improve accuracy in the Static field delivery of IMRT" Proceedings of the 22nd Annual EMBS International Conference, Chicago IL 23-28, 2000
  7. E.M. Fernandez, G.S. Shentalla, W.P.M. Maylesa, D.P. Dearnaley "The acceptability of a multileaf collimator as a replacement for conventional blocks" Radiol Oncol. 36, 65-74, 1995 https://doi.org/10.1016/0167-8140(95)01571-W
  8. Maarten L.P. Dirkx, Ben J.M. Heijmen, Gert A. Korevaar, Marjolein J.H. van Os, Joep C. Stroom, Peter C.M. Koper. "Field margin reduction using intensity-modulated x-ray beams formed with a multileaf collimator" Int. J. Radiation Oncology Biol. Phys. 38(5), 1123-1129, 1997 https://doi.org/10.1016/S0360-3016(97)00287-3
  9. Glenn F. Knoll: Radiation Detection and Measurement 4th ed. Wiley, Hoboken, 336, 2010