열형광선량계용 팬톰을 이용한 호흡 움직임에 따른 선량분포의 평가 = Analysis of the Respiratory Motion Effects on Dose Distribution Using TLD Phantom

다국어 초록 (Multilingual Abstract)

The purpose of this study was to measure the dose distribution from the moving phantom for the respiratory motion. The phantom for TLD measurement was designed and built for this study based on the multiple plates for placing TLD and film. The TLDs may be inserted at 3 mm intervals in each TLD plate. For the measurements, TLD plate was inserted into the phantom at 1.5 cm ($d_{max}$) depth, and phantom was allowed to move in SI directions in the range of 1 to 2 cm with 0.5 cm interval for 6 MV X-ray beams. Penumbra and FWHM were measured at both moving state and compared stationary. It was found that penumbra increased 0.71 cm at stationary and 2.10 cm at moving state in 2 cm movement, and that FWHM are 7.52 cm for stationary state and 7.02 cm for moving state (2 cm movement). In this study, film was used to compared with TLD results of measurements and simitar results were observed. Therefore, it is expected that TLD moving phantom may be useful for the treatment of tumors that move due to the respiratory motion.

참고문헌 (Reference)

1 Lujan AE, "method for incorporating organ motion deu to breathing into 3D dose calculations" 26 : 715-720, 1999

2 Kitamura K, "Tumor location, cirrhosis and surgical history contribute to tumor movement in the liver, as measured during sterotqactic irradiation using a real time tumor tracking radiotherapy system" 56 : 221-228, 2003

3 Kron T, "Thermoluminescence dosimetry of therapeutic x-rays with LiF ribbons and rods" 38 : 833-845, 1993

4 Chang SD, "Robotics and radiosurgery-the cyberknife" 76 : 204-208, 2001

5 Hideo DK, "Respiration gated radiotherapy treatment: a technical study" 41 : 83-91, 1996

6 Gierga DP, "Quantification of respiration-induced abdominal tumor motion and its impact on IMRT dose distribution" 58 : 1584-1595, 2004

7 Sankar A, "Evaluation of gafchromic EBT film for intensity modulated radiation therapy dose distribution verification" 31 (31): 2006

8 Gunilla CB, "A customized head and neck support system" 32 : 245-248, 1995

9 André B,, "A comparative description of three multipurpose phantoms (MPP) for external audits of photon beams in radiotherapy: the water MPP, the Umeå MPP and the EC MPP" 55 : 285-293, 1999