Orthovoltage X-rays
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Overview
Orthovoltage X-rays are produced by linear accelerators operating at voltages in the 200–500 kV range, and therefore an energy in the 200–500 keV range (see External beam radiotherapy for an explanation of the maximum and mean energies as a function of voltage). When used to treat patients, radiation oncologists find that they penetrate to a useful depth of about 4–6 cm. That makes them good for treating skin, superficial tissues, and ribs, but not for deeper structures such as lungs or pelvic organs.
Orthovoltage X-rays are sometimes termed "deep" X-rays (DXR). Historically, as radiation machines were improved in the 1930s–'40s, the beam energy (and so its penetration) were increased. So as the new 200–500 kV beams became available, they were considered 'deep'. Now, with modern linear accelerators being able to produce X-rays of much higher energy, the penetration of orthovoltage X-rays is considered quite shallow.
By convention, the voltage is used to characterize X- and gamma-ray beams (in volts), whilst electron beams are characterized by their energies (in electronvolts).
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
