Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지
DOI QR코드

DOI QR Code

Development and utility evaluation of new Multi-Leaf Collimator for Diagnostic X-ray Equipment

  • Ji, Hoon (Division of medical radiation equipment, Korea Institute of Radiological and Medical Sciences) ;
  • Han, Su Chul (Division of medical radiation equipment, Korea Institute of Radiological and Medical Sciences) ;
  • Baek, Jong Hyeun (Dept. of Biomedical Engineering, Tongmyong University) ;
  • Lee, Dong Hoon (Dept. of Biomedical Engineering, Tongmyong University) ;
  • Park, Seungwoo (Division of medical radiation equipment, Korea Institute of Radiological and Medical Sciences)
  • Received : 2017.04.10
  • Accepted : 2017.12.06
  • Published : 2018.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

The diagnostic multi-leaf collimator preventing unnecessary dose from entering into patients during the diagnostic examination was made in this study. The movement of the entire 50 leaves was embodied with the group of 25 ones thereof configured in a pair facing each other on the left and right of the median line. Dimensions of the length, width, and height of each shielding leaf were $5{\times}0.5{\times}0.5cm^3$ resulting in the maximum boost field of $10{\times}10cm^2$. The material of multi-leaf collimator had the excellence on the machinability with the use of the SKD-11 alloy tool steel having the high wear resistance against frequent movement, and it was devised to control both-side's shielding leaves by moving 2 motors unlike existing remedial multi-leaf collimator that use as many motors as the number of 50 shielding leaves. Thereafter, the transmission dose of leaves, cross-leaf leakage dose, and inter-leaf leakage dose were measured by the developed multi-leaf collimator attached to X-ray equipment. An ionization chamber was used to detect doses there from, and the comparative analysis was carried out by means of the radiographic film that was easy to detect the dose leakage in between each leaf. Results obtained from the test conducted in comparative analysis yielded approximately 98%, 96%, and 94% of shielding efficiency realized at each level of energy of 80kV, 100kV, and 120kV it was confirmed there was no dose leakage resulted from the varied level of irradiation energy. Thus the multi-leaf collimator to be developed based on this study is thought that it could fully reduce the unnecessary dose to patients in the diagnostic test and the shielding efficiency thereof is expected to be increasing if it is made in a miniaturized form with a way of increasing the thickness of each leaf later for an extended application to general diagnostic purposes.

Keywords

References

  1. Tsapaki V, Aldrich JE, Sharma R, Staniszewska MA., Krisanachinda A. et al. "Dose reduction in CT while maintaining diagnostic confidence: diagnostic reference levels at routine head, chest, and abdominal CT-IAEA-coordinated research project," Radiology, vol. 240, no. 3, pp. 828-834, Jul. 2006. https://doi.org/10.1148/radiol.2403050993
  2. Han S, Lee B, Shin G, Choi J, Kim J et al. "Dose area product measurement for diagnostic reference levels and analysis of patient dose in dental radiography," Radiat Prot Dosim, vol. 150, no. 4, pp. 523-531, Dec. 2012. https://doi.org/10.1093/rpd/ncr439
  3. Shortt, C. P., Fanning, N. F., Malone, L., Thornton, J., Brennan, P. and Lee, M. J. "Thyroid dose during Neurointerventional procedure: does lead shielding reduces the dose?" Cardiovascular Interv Radiol, vol. 30, no. 5, pp. 922-927, May. 2007. https://doi.org/10.1007/s00270-007-9093-7
  4. Han SC, Kwon SC. "Radiation dose reduction to the critical organ with bismuth shielding during endovascular coil embolisation for cerebral aneurysms," Radiat Prot Dosim, vol. 156, no. 3, pp. 364-371, Mar. 2013. https://doi.org/10.1093/rpd/nct070
  5. Hopper, K. D., Neuman, J. D., King, S. H. and Kunselman, A. R. "Radioprotection to the eye during CT scanning," AJNR Am J Neuroradiol, vol. 22, no. 6, pp. 1194-1198, Jun. 2001.
  6. McLaughlin, D. J. and Mooney, R. B. "Dose reduction to radiosensitive tissues in CT: do commercially avail available shields meet the users' needs?" Clinical Radiology, vol. 59, no. 5, pp. 446-450, June. 2004. https://doi.org/10.1016/j.crad.2003.10.016
  7. Moritake, T., Matsumaru, Y., Takigawa, T., Nishizawa, K., Matsumara, A. and Tsuboi, K. "Dose measurement on both patients and operators during Neurointerventional procedures using photo-luminescence glass dosimeters," AJNR Am J Neuroradiol, vol. 29, no. 10, pp. 1910-1917, Aug. 2008. https://doi.org/10.3174/ajnr.A1235
  8. Prins, R., Dauer, L. T., Colosi, D. C., Quinn, B., Kleiman, N., Bohle, G., Holohan, B., Al-Najjar, A., Fernandez, T., Bonvento, M. et al. "Significant reduction in dental cone beam computed tomography (CBCT) eye dose through the use of leaded glasses," Oral Surg Oral Med Oral Pathol Oral Radiol Endod, vol. 112, no. 4, pp. 502-507, Jul. 2011. https://doi.org/10.1016/j.tripleo.2011.04.041
  9. Khan FM. "Treatment planning III: The physics of radiation therapy," Baltimore/Lodon Williams & wikins, pp. 320-323, 1994.
  10. Robins hn I. "Apparat zur radiologischen Belichtung lebender under lebloser Objekte," German patent nr, pp. 192-300, 1906.
  11. S Webb. "The physics of three-dimensional radiation therapy," lnstitute of physics publishing Bristol and Philadelphia, pp. 218-245, Jan. 1993.
  12. Kitabatake T. "Development of telecobalt therapy unit with a new collimation device for conformation radiotherapy," Nippon actaradiol, vol. 26, pp. 192-200, 1996
  13. Helyer SJ, Heisig S. "Multileaf collimation versus conventional shielding block : a time nad motion study of beam shaping in radiotherapy," Radiotherapy and Oncology, vol. 37, no. 1, pp. 61-64, Oct. 1995. https://doi.org/10.1016/0167-8140(95)01616-O
  14. LoSasso T, Chui Cs, Kutcher GL, Leibel SA, Fuks Z, Ling CC. "The use of a multi-leaf collimator for conformal radiotherapy of carcinomas of the prostate and nasopharynx," lnt J Radiation Oncology Biol Phys, vol. 25, no. 2, pp. 161-170, Jan. 1993. https://doi.org/10.1016/0360-3016(93)90337-U
  15. Powlis WD, Smith AR, Cheng E, et al "initiation of multileaf collimator conformal radiation therapy," int J Radiation Oncology Biol Phys, vol.25, no.2, pp. 171-179, Jan. 1993. https://doi.org/10.1016/0360-3016(93)90338-V
  16. Galvin JM, Smith AR, Moeller RD. "Evaluation of multileafcollimatior design for photon beam," lnt J Radiation Oncology Bio lPhys, vol. 23, no. 4, pp. 789-801, 1992. https://doi.org/10.1016/0360-3016(92)90652-X
  17. Boyer Al, Ochran TG, Nyerick CE, Waldron TJ, Huntzinger CJ. "Clinical dosimetry for implementation of a collimator," Med phys, vol. 19, no. 5, pp. 1255-1261, Sep. 1992. https://doi.org/10.1118/1.596757
  18. Huq MS, Yu Y, Chen ZP, Suntharalingam N "Dosimetric characteristics of a commercial multileaf collimator," Med Phys, vol. 22, no. 2, pp. 241-247, Feb. 1995. https://doi.org/10.1118/1.597461