28. Linear accelerators (Linacs)
Creates a high-energy beam of
X-rays by accelerating electrons
into a tungsten target.
Linacs come with different energies:
usually 6MV, 10MV, 15MV, 18MV
29. Linear Accelerator
• Type of cancer incidences
• Bunker size
• Beam Modality
• Photon, electron
• SRS/SRT/SBRT – MLC/mMLC etc
• FF/FFF
• Special Techniques (TBI/TSET/Electron Arc)
• EPID –Portal, Phantom for EPID QA
• Exit dosimetry (Third party item – Log file analysis)
• CBCT – Iterative/4D
• All algorithms for various work modules
• Dose deformation and adaptations etc.
7/2/2019 Osama Anjak 29
30. Linear Accelerator
• Motion management HW& SW
• CBCT HW& SW
• Phantoms, Chamber adaptors, cables
• Beam Matching if similar models
• Electron Applicators
• Accessories for special procedures (TSET/TBI)
• TPS (dose engine and contouring workstations)
• Networking & Server
• Record & Verify
7/2/2019 Osama Anjak 30
34. Varian High Energy Linear Accelerators
•Edge Radiosurgery System:
• EDGE performs treatments with a technique known as
VMAT (Volumetric Modulated Arc Therapy) and a feature
FFF (Flattening Filter Free)
• 2013 & newer
• 6&10/15/18MV & Electron beam
7/2/2019 Osama Anjak 34
37. Key factors to consider when purchasing a linear
accelerator (Linac)
•Among the factors considered were:
• Ease of use;
• Functionality;
• Reliability;
• Siting requirements;
• Implementation;
• Service;
• Vendor support;
• Training; and
• Cost7/2/2019 Osama Anjak 37
38. Linac Imaging System
A single 2D image “shadow” of the 3D body (one
dimension is integrated loss of information) EPID
Coronal or
frontal
Sagittal
Tomography
2D image
7/2/2019 Osama Anjak 38