Abstract
The Mega‐Voltage Cone‐Beam CT (MVCBCT) system provides a 3D image of the patient anatomy in the actual treatment position that can be tightly aligned to the planning CT, allowing daily verification and correction of the patient position moments before the dose delivery. Integrated onto a linear accelerator, the system consists of a new a‐Si flat panel adapted for MV imaging and a workflow application allowing the automatic acquisition of projection images at low dose rate, CBCT image reconstruction, CT to CBCT image registration and couch position adjustment. MVCBCT provides accurate electron density and allows studies of dosimetrical impact of setup error, anatomical changes or in presence of implanted metallic objects.This lecture will provide an overview of the physics characteristics of MV and MV CBCT imaging, acquisition and reconstruction, image registration, alignment precision and quality assurance procedures. A description of the workflow and a survey of the clinical applications, indications and protocols will be presented. Finally, current challenges and future developments will be addressed.Educational objectives1. Understand the basics of MV Cone‐Beam CT imaging.2. Understand the possibilities of daily 3D Imaging for patient alignment and other applications.3. Understand the clinical roles of Image‐Guided (IGRT) and Dose‐ Guided (DGRT) Radiation Therapy.This work was supported by Siemens Oncology Care Systems.
Published Version
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