LINAC

LINAC

by: M.Ovais.Ur.Rehman

1. LINAC

2. Biomedical Engineering System Dedicated to: Sir Fahad Akbar Ali. From: Muhammad Ovais Ur Rehman 2011/BM/20 Fb : www.facebook.com/muhammad.ovais.56

3. 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.

4. LINAC (schematic diagram)

5. components of Linear Accelerator Radio frequency Power source Modulator Electron Gun Accelerator guide

6. 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.

7. 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.

8. LINAC

9. A power supply Provides DC power to the modulator Modulator the magnetron Deliver the pulses to the electron gun Pulsed microwaves the accelerator tube or structure via a waveguide systems. electrons

10. 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.

11. Thank you