Evaluation of Setup When Using C-Rad System in Radiotherapy

방사선치료 시 C-Rad system을 이용한 셋업의 평가

  • 박은태 (인제대학교 부산백병원 방사선종양학과) ;
  • 고성진 (부산가톨릭대학교 보건과학대학 방사선학과) ;
  • 최석윤 (부산가톨릭대학교 보건과학대학 방사선학과) ;
  • 김정훈 (부산가톨릭대학교 보건과학대학 방사선학과) ;
  • 김창수 (부산가톨릭대학교 보건과학대학 방사선학과) ;
  • 김동현 (부산가톨릭대학교 보건과학대학 방사선학과) ;
  • 강세식 (부산가톨릭대학교 보건과학대학 방사선학과)
  • Received : 2012.03.08
  • Accepted : 2012.04.19
  • Published : 2012.05.28


In radiotherapy, accurate patient positioning and set up are important factor that treatment can influence success. In generally, the 3-laser system is used when the patient set up. But today the body surface scanning system(C-Rad system) is trying to use. Compare and evaluate the C-Rad system and the 3-laser system to check availability. Head and neck that are no movement of internal organs and easy to apply fixation device are limited. Alderson Rando anthropomorphic phantom and 10 patients who have lesions of head and neck are targeted. C-RAD system's setup error mean and standard deviation are the X axis($0.55{\pm}0.51mm$), Y axis($-0.2mm{\pm}0.523mm$), Z axis($-0.85{\pm}0.587mm$) in the phantom study, and in the patient study X axis($-0.05{\pm}0.621mm$), Y axis($0.075{\pm}0.755mm$) Z axis($-1.025{\pm}0.617mm$). So C-RAD system is better than 3-laser system mostly, but C-RAD system's error rate is a little worse than 3-laser system in the Z axis. When radiation treatment of head and neck, body surface contour scanning system contribute to correct positioning and minimize the set up error.


Radiotherapy;Patient Positioning;3-laser System


  1. F. M. Khan, The Physics of Radiation Therapy 4/E, Lippincott Williams & Wilkins, 2009.
  2. T. S. Hong, W. A. Tome, and R. J. Chappell, et al, "The impact of daily setup variations on head-and-neck intensity-modulated radiation therapy," Int J Radiat Oncol Biol Phys, Vol.61, No.3, pp.779-788, 2005.
  3. J. L. Peng, D. Kahler, and J. G. Li, et al, "Characterization of a real-time surface image-guided stereotactic positioning system," Med Phys, Vol.37, No.10, pp.5421-5433, 2010.
  4. A. Brahme, P. Nyman, and B. Skatt, "4D laser camera for accurate patient positioning, collision avoidance, image fusion and adaptive approaches during diagnostic and therapeutic procedures," Med Phys, Vol.35, No.5, pp.1670-1681, 2008.
  5. P. J. Schoffel, W. Harms, and G. Sroka-Perez, et al, "Accuracy of a commercial optical 3D surface imaging system for realignment of patients for radiotherapy of the thorax," Phys Med Biol, Vol.52, No.13, pp.3849-3863, 2007.
  6. C. Bert, K. G. Metheany, and K. P. Doppke, et al, "Clinical experience with a 3D surface patient setup system for alignment of partial-breast irradiation patients," Int J Radiat Oncol Biol Phys, Vol.64, No.4, pp.1265-74, 2006.
  7. M. Krengli, S. Gaiano, and E. Mones, et al, "Reproducibility of patient setup by surface image registration system in conformal radiotherapy of prostate cancer," Int J Radiat Oncol, Vol.4, No.9, 2009.
  8. C. Bert, K. G. Metheany, and K. Doppke, et al, "A phantom evaluation of a stereo-vision surface imaging system for radiotherapy setup," Med Phys, Vol.32, No.9, pp.2753-2762, 2005.
  9. L. S. Ploeger, M. Frenay and A. Betgen, et al, "Application of video imaging for improvement of patient setup," Radiother Oncol, Vol.68, No.3, pp.277-284, 2003.
  10. P.A. Kupelian, C. Lee, and K. M. Langen, et al, "Evaluation of image-guidance strategies in the treatment of localized prostate cancer," Int J Radiat Oncol Biol Phys, Vol.70, No.4, pp.1151-1157, 2008.

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