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

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
Kwangwoo ParkJaeho Cho

Abstract

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.

References

Feb 1, 1988·International Journal of Radiation Oncology, Biology, Physics·W LutzN Maleki
Jan 15, 1994·International Journal of Radiation Oncology, Biology, Physics·G H HartmannW J Lorenz
Oct 25, 2001·Journal of Applied Clinical Medical Physics·L ChangC C Sung
Apr 18, 2002·Journal of Applied Clinical Medical Physics·Keith T WelshL E Reinstein
Jul 21, 2004·Medical Physics·A GonzálezJ A Martínez
Mar 7, 2006·Journal of Applied Clinical Medical Physics·Lucie BergerJean-Claude Rosenwald
Aug 19, 2008·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Wouter van ElmptBen Mijnheer

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