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Dedicated to:
From:
Linear accelerator
• Medical linear accelerators (linac) units are used in external beam radiation therapy to treat cancer.
• IT IS A THEREPATIC EQUIPMENT
• Linacs emit a well-defined beam of uniformly intense x-ray photon radiation of different energies, depending on the accelerator.
LINAC (schematic diagram)
components of Linear Accelerator
• Radio frequency Power source
• Modulator
• Electron Gun
• Accelerator guide
Working Principle:
▫ The modulator amplifies the AC power supply, rectifies it to DC power, and produces high-voltage DC pulses that are used to power the electron gun and RF power source.
▫ High-voltage cables electrically connect the electron gun and RF power source to the modulator, which can be located in the gantry.
▫ The electron gun injects electrons into the accelerator guide in pulses of the appropriate duration, velocity, and position to maximize acceleration.
▫ The RF power source, either a magnetron supplies high-frequency electromagnetic waves which accelerate the electrons injected from the electron gun down the accelerator guide.
A power supply Provides DC power to the modulator
Modulator
the magnetron
Deliver the pulses to the electron gun
Pu
lsed
mic
row
av
es
the accelerator tube
or structure via a
waveguide systems.
elec
trons
Applications:
• linacs are used primarily to treat bone cancer and tumors of the head and neck.
• High energy linacs are used to treat deep tumors of the pelvis and thorax.
Thank you