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  2. External beam radiotherapy - Wikipedia

    en.wikipedia.org/wiki/External_beam_radiotherapy

    Superficial radiation therapy machines produce low energy x-rays in the same energy range as diagnostic x-ray machines, 20–150 keV, to treat skin conditions. [2] Orthovoltage X-ray machines produce higher energy x-rays in the range 200–500 keV. Radiation from orthovoltage x-ray machines has been called "deep" due to its greater penetrating ...

  3. Orthovoltage X-rays - Wikipedia

    en.wikipedia.org/wiki/Orthovoltage_X-rays

    8-521. [edit on Wikidata] Orthovoltage X-rays are produced by X-ray tubes operating at voltages in the 100–500 kV range, and therefore the X-rays have a peak energy in the 100–500 keV range. [1] Orthovoltage X-rays are sometimes termed "deep" X-rays (DXR). [2] They cover the upper limit of energies used for diagnostic radiography, and are ...

  4. Radiation therapy - Wikipedia

    en.wikipedia.org/wiki/Radiation_therapy

    Megavoltage X-ray units were first built in the late 1930s but because of cost were limited to a few institutions. One of the first, installed at St. Bartholomew's hospital, London in 1937 and used until 1960, used a 30 foot long X-ray tube and weighed 10 tons.

  5. Particle therapy - Wikipedia

    en.wikipedia.org/wiki/Particle_therapy

    Particle therapy. ICD-9. 92.26. [edit on Wikidata] Particle therapy is a form of external beam radiotherapy using beams of energetic neutrons, protons, or other heavier positive ions for cancer treatment. The most common type of particle therapy as of August 2021 is proton therapy. [1]

  6. Proton therapy - Wikipedia

    en.wikipedia.org/wiki/Proton_therapy

    In medicine, proton therapy, or proton radiotherapy, is a type of particle therapy that uses a beam of protons to irradiate diseased tissue, most often to treat cancer.The chief advantage of proton therapy over other types of external beam radiotherapy is that the dose of protons is deposited over a narrow range of depth; hence in minimal entry, exit, or scattered radiation dose to healthy ...

  7. CT scan - Wikipedia

    en.wikipedia.org/wiki/CT_scan

    However, a lumbar spine X-ray has a similar dose as a head CT. [150] Articles in the media often exaggerate the relative dose of CT by comparing the lowest-dose X-ray techniques (chest X-ray) with the highest-dose CT techniques. In general, a routine abdominal CT has a radiation dose similar to three years of average background radiation. [151]

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