Linear accelerator in medicine XR Tubes Particles Accelerators

Linear accelerator in medicine XR Tubes Particles Accelerators Ø Betatron Ø Cyclotron Ø Synchrocyclotron Ø Synchrotron ØLinear accelerator

Medical Linear accelerator • Photon Beam (X-Ray): • 4 MV To 22 MV. • Single Beam. • Duel Beams • Electron Beam: • Multi-Beams with energy grope between: 4 - 22 Me. V.

Linac : Linear accelerator The linear accelerator is a device that uses highfrequency electromagnetic waves to accelerate charged particles such as electrons to high energies through a linear tube. There are several types of linear accelerator designs, but the ones used in radiotherapy accelerate electrons either by traveling or stationary electromagnetic waves of frequency in microwave region (≈ 3000 megacycles/sec).

The difference between traveling wave and stationary wave accelerators is Functionally the design of the accelerator structure the traveling wave structures require a terminating, the standing wave structures provide maximum reflection of the waves at both ends of the structure or "dummy", load in order to absorb the residual power at the end of the structure, the combination of forward and reverse traveling waves will give rise to stationary waves. thus preventing a backward reflected wave

Medical Linear accelerator Accelerator Tube Treatment Head (Straight Beam) Electron Gun Wave Guide system Modulator Magnetron Or Klystron Bending Magnet Treatment Head (Bent Beam) Power Supply A block diagram of typical medical Linear Accelerator

The major components of medical Linear Accelerator Power Supply Modulator Magnetron Or Klystron Electron Gun Wave Guide system Accelerator Tube Bending Magnet Treatment Head (Straight Beam) Treatment Head (Bent Beam)

Modulator Electron Gun Flatining Filter Cros Section of Accelerator tube

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

Linear accelerator 4 Groups The accelerator The table The collimator multilames Portale Imaging

Electron Gun

Varian Siemens Elekta