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Mechanical quality assurance using light field for linear accelerators with camera calibration

 Kwangwoo Park  ;  Wonhoon Choi  ;  Ki Chang Keum  ;  Ho Lee  ;  Jeongmin Yoon  ;  Chang Geol Lee  ;  Ik Jae Lee  ;  Jaeho Cho 
 Physica Medica, Vol.32(2) : 398-402, 2016 
Journal Title
 Physica Medica 
Issue Date
Calibration ; Mechanical Phenomena* ; Particle Accelerators* ; Quality Control ; Radiotherapy/instrumentation* ; Rotation
Camera calibration ; Lens distortion ; Light field ; Mechanical isocenter ; Quality assurance (QA)
Mechanical Quality Assurance (QA) is important to assure spatially precise delivery of external-beam radiation therapy. As an alternative to the conventional-film based method, we have developed a new tool for mechanical QA of LINACs which uses a light field rather than radiation. When light passes through the collimator, a shadow is projected onto a piece of translucent paper and the resulting image is captured by a digital camera via a mirror. With this method, we evaluated the position of the LINAC isocenter and the accuracy of the gantry, collimator, and couch rotation. We also evaluated the accuracy of the digital readouts of the gantry, collimator, and couch rotation. In addition, the treatment couch position indicator was tested. We performed camera calibration as an essential pre-requisite for quantitative measurements of the position of isocenter, the linear motion of the couch, and the rotation angles of the gantry and collimator. Camera calibration reduced the measurement error to submillimeter based on uncertainty in pixel size of the image, while, without calibration, the measurement error of up to 2 mm could occur for an object with a length of 5 cm.
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1. College of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학교실) > 1. Journal Papers
Yonsei Authors
Keum, Ki Chang(금기창) ORCID logo https://orcid.org/0000-0003-4123-7998
Park, Kwang Woo(박광우) ORCID logo https://orcid.org/0000-0002-9843-7985
Yoon, Jeongmin(윤정민)
Lee, Ik Jae(이익재) ORCID logo https://orcid.org/0000-0001-7165-3373
Lee, Chang Geol(이창걸) ORCID logo https://orcid.org/0000-0002-8702-881X
Lee, Ho(이호) ORCID logo https://orcid.org/0000-0001-5773-6893
Cho, Jae Ho(조재호) ORCID logo https://orcid.org/0000-0001-9966-5157
Choi, Won Hoon(최원훈)
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