용적변조회전 방사선치료 시 Set-up 오차에 따른선량 전달 정확성의 평가
Assessment of Dose Delivery Accuracy with Set-up Error for VMAT
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In order to investigate the effect of set-up error on the dose delivery, this study evaluates the accuracy of dose delivery due to set-up error by applying a virtual brain tumor treatment plan using volumetric modulated rotational radiation therapy (VMAT). After obtaining a crosssectional image with a CT device using Head Phantom, a treatment planning program was used to establish a VMAT treatment plan. Based on the treatment plan established, DQA was performed to assess the difference in dose delivery accuracy with set-up error. When the distance was changed to 7 mm with a distance of 1 mm on the basis of the measured value of 0 in the direction of Lat. and Vrt, a comparison was performed by deriving the average after 5 measurements each using a three dimensional array detector. We applied a virtual brain tumor treatment plan using VMAT. In the absence of set-up error, the measured values were 96.8%, 96.4%, 96.2% in Lat. ±1 mm, 96.2%, 95.9% in Lat. ±2 mm, 95.4%, 95.2% in Lat. ±3 mm, 92.0%, 90.1% in Lat. ±4 mm, 86.9%, 83.7% in Lat. ±5 mm, 85.6%, 80.3% in Lat. ±6 mm, 75.2%, 79.5% in Lat .±7 mm, respectively. 96.1%, 96.1% in Vrt. ±1 mm, 95.9%, 95.7% in Vrt. ±2 mm, 95.1%, 95.1% in Vrt. ±3 mm, 91.4%, 91.5% in Vrt. ±4 mm, 88.6%, 88.3% in Vrt. ±5 mm, 83.1%, 85.6% in Vrt. ±6 mm, 79.1%, 77.2% in Vrt. ±7 mm respectively. As the lateral and vertical error increases, the accuracy of the dose delivery decreases. In order to improve the accuracy of the dose delivery during VMAT treatment, we should try to reduce the error through accurate posture and appropriate image induction.
Abstract
In order to investigate the effect of set-up error on the dose delivery, this study evaluates the accuracy of dose delivery due to set-up error by applying a virtual brain tumor treatment plan using volumetric modulated rotational radiation therapy (VMAT). After obtaining a crosssectional image with a CT device using Head Phantom, a treatment planning program was used to establish a VMAT treatment plan. Based on the treatment plan established, DQA was performed to assess the difference in dose delivery accuracy with set-up error. When the distance was changed to 7 mm with a distance of 1 mm on the basis of the measured value of 0 in the direction of Lat. and Vrt, a comparison was performed by deriving the average after 5 measurements each using a three dimensional array detector. We applied a virtual brain tumor treatment plan using VMAT. In the absence of set-up error, the measured values were 96.8%, 96.4%, 96.2% in Lat. ±1 mm, 96.2%, 95.9% in Lat. ±2 mm, 95.4%, 95.2% in Lat. ±3 mm, 92.0%, 90.1% in Lat. ±4 mm, 86.9%, 83.7% in Lat. ±5 mm, 85.6%, 80.3% in Lat. ±6 mm, 75.2%, 79.5% in Lat .±7 mm, respectively. 96.1%, 96.1% in Vrt. ±1 mm, 95.9%, 95.7% in Vrt. ±2 mm, 95.1%, 95.1% in Vrt. ±3 mm, 91.4%, 91.5% in Vrt. ±4 mm, 88.6%, 88.3% in Vrt. ±5 mm, 83.1%, 85.6% in Vrt. ±6 mm, 79.1%, 77.2% in Vrt. ±7 mm respectively. As the lateral and vertical error increases, the accuracy of the dose delivery decreases. In order to improve the accuracy of the dose delivery during VMAT treatment, we should try to reduce the error through accurate posture and appropriate image induction.
참고문헌 (13)
- 박진호, "콘빔CT (CBCT)를 이용한 온라인 영상유도방사선치료(On-line Image Guided Radiation Therapy)", Radiation oncology journal, 24(4), pp.294~299 (2006), 대한방사선종양학회
- Bruno S, "Clinical application of image-guided radiotherapy, IGRT (on the Varian OBI platform)", Cancer Radioth, 10(5), pp.252~257 (2006)[DOI]
- Francisco CH, "A Probability Approach to the Study on Uncertainty Effects on Gamma Index Evaluations in Radiation Therapy", Int. J. Comput. Math., 2011, pp.1~10 (2011)
- Guckenberger M, "Dosimetric consequences of translation and rotational errors in frame-less image-guided radiosurgery", Radiat. Oncol., 7(1), pp.1~8 (2012)[DOI]
- Holtzer N, "Roll and Pitch Correction in Headand-Neck Patients by Rapid Adaptation of Volumetric Modulated Arc Treatment Plans", Int. J. Radiat. Oncol. Biol. Phys., 84(3), pp.S28~S29 (2012)
- Hussein M, "A comparison of the gamma index analysis in various commercial IMRT", VMAT QA systems, 2013, pp.109(3), 370~376
- 김동현, "뇌ㆍ두경부 방사선치료 시 전자조사문영상장치를 이용한 세트업 오차 확인에서 제2경추 치상돌기 위치의 임상적 의의", Radiation oncology journal, 29(2), pp.107~114 (2011), 대한방사선종양학회
- Kim JD, "Analyses of the Setup Errors using on Board Imager (OBI)", J. Korean Soc. Radiat Ther., 19(1), pp.1~5 (2007)
- Kim SH, "Evaluate the Implementation of Volumetric Modulated Arc Therapy QA in the Radiation Therapy Treatment according to Various Factors by Using the Portal Dosimetry", J. Korean Soc. Radia Ther., 27(2), pp.167~174 (2016)
- Lee DH, "The Accuracy Evaluation according to Dose Delivery Interruption and Restart for Volumetric Modulated Arc Therapy", J. Korean Soc. Radiat Ther., 25(1), pp.77~85 (2013)
- Li G, "Evaluation of the ArcCHECK QA system for IMRT and VMAT verification", Phys. Medica, 29(3), pp.295~303 (2013)[DOI]
- Stasi M, "Pretreatment patient-specific IMRT quality assurance : a correlation study between gamma index and patient clinical dose volume histogram", Med. Phys., 39(12), pp.7626~7634 (2012)[DOI]
- Stock M, "Interpretation and evaluation of the <TEX>${\gamma}$<", TEX> index and the <TEX>${\gamma}$<, Phys. Med. Biol., pp.2005, 50(3)[DOI]