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

Catphan

Penta Guide