2016_Imaging for Physicists
QA of CBCT
Recommended reading: Commissioning experience with cone beam computed tomography for image-guided radiation therapy Lehmann et al. Journal of applied clinical physics 2007 Clinical use of electronic portal imaging: Report of AAPM Radiation Therapy Committee Task Group 58 AAPM Medical Physics Practice Guideline 2.a: Commissioning and quality assurance of X-ray–based image-guided radiotherapy systems
• Alignment of kV and MV lines – verify isocenter 3D agreement
– verify registration and alignment process
• Image quality
– monitor image quality parameters – watch for degradation
• Patient dose
– measure base value (surrogates: air dose, HVL) – monitor changes
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