지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국의학물리학회 의학물리 의학물리 제28권 제4호
- 발행연도
- 2017.12
- 수록면
- 190 - 196 (7page)
- DOI
- https://doi.org/10.14316/pmp.2017.28.4.190
이용수
초록· 키워드
오류제보하기
For the ViewRay® system (ViewRay Inc., Cleveland, OH, USA) which is representative of magnetic resonance (MR) guided radiotherapy machine, it is important to evaluate effectiveness of AAPM’s TG-51 protocol and the effect of the magnetic field on absolute dosimetry. In order to measure the absolute dose, MR-compatible chamber and water phantom system manufactured in this study were used. The materials of the water phantom system were plastic of polymethyl methacrylate (PMMA) and non-ferrous materials. Due to the inherent feature of the ViewRay®, all Co-60 sources are not located at gantry angle of 0° while being located at gantry angle of 90°. For this reason, absolute dosimetry was performed based on the measurements in solid water phantom (SWP) and water which determine the SWP to water correction factor. For evaluation of output constancy with gantry angle, measurements were made with ionization chamber inserted in cylindrical water-equivalent phantom. For measured doses in water, the values of dose deviation according to a reference dose of 200 cGy for Head 1, Head 2 and Head 3 were ?0.27%, ?0.45% and ?0.22%, respectively. For measured doses in SWP, the values of dose deviation according to a reference dose of 200 cGy for Head 1, Head 2 and Head 3 were ?1.91%, ?2.07% and ?1.84%, respectively. All values of dose measured in SWP tended to be less than those measured in water by ?1.63%. With the reference gantry angles of 0° and 90°, the maximum values of deviation for Head 1, Head 2 and Head 3 were 0.48%, 1.06% and 0.40%, respectively. The measurement agreement is within the range of results obtainable for conventional treatment machines. The low strength of the magnetic field does not affect dose measurements. Using the SWP to water correction factor, absolute doses for ViewRay® system can be measured.
목차
등록된 정보가 없습니다.
참고문헌 (29)
참고문헌 신청
박종민 / 2015 / Commissioning Experience of Tri-Cobalt-60 MRI-guided Radiation Therapy System / 의학물리 26(4):193~200
Stam MK / 2013 / Kidney motion during free breathing and breath hold for MR-guided radiotherapy / Phys Med Biol 58:2235~2245
Seierstad T / 2009 / MR-guided simultaneous integrated boost in preoperative radiotherapy of locally advanced rectal cancer following neoadjuvant chemotherapy / Radiother Oncol 93:279~284
Dawson LA / 2007 / Advances in Image-Guided Radiation Therapy / J Clin Oncol 25:938~946
Court L / 2003 / Evaluat ion of mechanical precision and alignment uncertainties for an integrated CT/LINAC system / Med Phys 30:1198~1210
Stam MK / 2013 / Kidney motion during free breathing and breath hold for MR-guided radiotherapy / Phys Med Biol 58:2235~2245
Seierstad T / 2009 / MR-guided simultaneous integrated boost in preoperative radiotherapy of locally advanced rectal cancer following neoadjuvant chemotherapy / Radiother Oncol 93:279~284
Dawson LA / 2007 / Advances in Image-Guided Radiation Therapy / J Clin Oncol 25:938~946
Court L / 2003 / Evaluat ion of mechanical precision and alignment uncertainties for an integrated CT/LINAC system / Med Phys 30:1198~1210
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