Clinical application of varian OBI CBCT system and dose reduction techniques in breast cancer patients setup

Medical Physics
Stefan UeltzhöfferYulia Lyatskaya

Abstract

To characterize the standard modes of Varian on board imaging (OBI) v1.4 system and identify techniques to further optimize imaging parameters, in particular, for breast treatment setup. A male anthropomorphic torso phantom was used for image quality assessment and a simpler thorax phantom for dose measurements. Both phantoms had artificial breasts attached. Doses were measured with an ion chamber in seven locations in the thorax and the breast. Evaluation of image quality was performed in terms of contrast-to-noise ratio (CNR) and in combination with the dose-to-contrast-to-noise (CNRD) parameter. The effect of kVp and mAs on the image quality, dose, and CNRD parameter was analyzed. In addition, image geometry with noncentral isocenter location with start and stop imaging angles adjusted for greater sparing of the contralateral breast was evaluated in terms of image quality and dose. The measurements showed doses between 0.02 and 1.6 cGy for the three full-fan modes and 0.6-3.2 cGy for half-fan modes. This is a reduction of over 80% and 30%-50% compared to OBI v.1.3 modes for full-fan and half-fan modes, respectively. The CNRD is the highest for both low dose modes (low dose thorax and low dose head). Optimal ranges for an ave...Continue Reading

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Citations

Mar 19, 2014·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Alexandra QuinnPeter Metcalfe
Dec 19, 2013·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)·S Lee, H-J Kim
May 16, 2012·Journal of Applied Clinical Medical Physics·Sook Kien NgYulia Lyatskaya
Jul 7, 2018·Journal of Applied Clinical Medical Physics·Maija RossiMika Kapanen
May 3, 2019·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Yuliang HuangYibao Zhang

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