linear accelerator(redirected from Linear accelerators)
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Related to Linear accelerators: electron linear accelerator
lin·e·ar ac·cel·er·a·tor (LINAC),
a device imparting high velocity and energy to atomic and subatomic particles; an important device for radiation therapy.
linear accelerator (LINAC)
Etymology: L, linea, line, accelerare, to quicken
an apparatus for accelerating charged subatomic particles, used in radiotherapy, physics research, and the production of radionuclides. A pulsed electron beam generated by an electron gun passes through a long, straight vacuum tube containing alternating hollow electrodes. The electrodes are arranged so that, when their high-frequency potentials are properly varied, the electrons passing through the tube receive successive increments of energy. The electrons are stopped abruptly by a heavy metal target at the end of the tube and directed by a collimator to deliver supervoltage x-rays to the patient receiving radiotherapy.
linear acceleratorA device that accelerates radioactive particles and beams to body regions affected by malignancy, while minimising damage to normal tissue. Linear accelerators use electrodes and gaps arranged in a straight line, proportioned so when electrical potentials are varied with the proper amplitude and frequency, particles passing through the waveguide receive successive increments of energy, and are therefore accelerated; the device delivers therapeutic radiation in the range of 4 to 25 million volts, as either intense radiation or high-energy electron beams—most commonly, 60Co, delivering 2–10 Gy/min (200–1,000 rads/min) at the centre of an internal malignancy.
External beam radiation therapy, stereotactic body radiotherapy, stereotactic radiosurgery.
Head and neck cancer, prostate cancer, Hodgkin lymphoma and other lymphoproliferative malignancies, seminomas and localised breast cancer, in combination with an excision of malignant lumps.
lin·e·ar ac·cel·er·a·tor(lin'ē-ăr ak-sel'ĕr-ā-tŏr)
A device imparting high velocity and energy to atomic and subatomic particles; an important device for radiation therapy.