Tag Archives: Radiation Therapy

Positron Emission Tomography (PET) Cyclotron

Hariette A.W.

Built by Lawrence in 1929 Accelerates positive particles rather than the electrons Uses positively charged particles such as proton, neutron, alphas, deuterons, short- lived radioisotopes Particles are accelerated in a circular chamber called dees The particles are accelerated by electric fields between the dees until the particle acquires the desired energy Powerful magnetic filed are employed to confine the particle to a circular path Protons are not commonly used for radiation therapy In some centers, deuterons produced by cyclotron are brought out and allowed to strike targets of beryllium leading to the production of neutrons, such neutrons can be used Click Here To Read More

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LINACS (Linear Accelerators) and Its Major Components

Hariette A.W.

- gradually replaces the cobalt-60 – produces gamma rays, x-rays and electrons; more energetic than cobalt-60. – operates at 4 MeV to 20 MeV – the charged particles travel in a straight line as they gain energy from alternating EM field. – higher energy beams can be generated with greater skin sparing. – field edges are more abruptly design with less penumbra and personnel receive less exposure to radiation leakage. – provides better isodose distribution (greater dose to the tumor and less dose to normal tissues) – fastest dose rate and more manageable radiation protection concerns. • LINACS producing electrons- Click Here To Read More

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