By Faiz M. Khan PhD, John P. Gibbons PhD
Dr. Khan's vintage textbook on radiation oncology physics is now in its completely revised and up-to-date Fourth version. It presents the full radiation remedy team—radiation oncologists, scientific physicists, dosimetrists, and radiation therapists—with an intensive figuring out of the physics and useful medical functions of complicated radiation treatment applied sciences, together with 3D-CRT, stereotactic radiotherapy, HDR, IMRT, IGRT, and proton beam remedy. those applied sciences are mentioned besides the actual recommendations underlying remedy making plans, therapy supply, and dosimetry. This Fourth version contains brand-new chapters on image-guided radiation treatment (IGRT) and proton beam treatment. different chapters were revised to include the latest advancements within the box. This version additionally beneficial properties greater than a hundred full-color illustrations all through. A significant other web site will provide the absolutely searchable textual content and a picture financial institution.
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Extra resources for The Physics of Radiation Therapy
The machine operates typically at a tube current of 2 mA. 0 cm or less. 0-mm-thick aluminum is usually interposed in the beam to absorb the very soft component of the energy spectrum. Because of very short SSD and low voltage, the contact therapy beam produces a very rapidly decreasing depth dose1 in tissue. For that reason, if the beam is incident on a patient, the skin surface is maximally irradiated but the underlying tissues are spared to an increasing degree with depth. 1, line b. It is readily seen that this quality of radiation is useful for tumors not deeper than 1 to 2 mm.
Diagram to explain the production of characteristic radiation. S. Department of Health, Education, and Welfare. Radiological Health Handbook. Rev. ed. Washingto Printing Office; 1970. It should be noted that, unlike bremsstrahlung, characteristic radiation or x-rays are emitted at discrete energies. If the transition involved an electron descending from the L shell to the K shell, then the photon emitted will have energy hv = EK - EL, where EK and EL are the electron-binding energies of the K shell and the L shell, respectively.
Supervoltage Therapy X-ray therapy in the range of 500 to 1,000 kV has been designated as high-voltage therapy or supervoltage therapy. In a quest for higher-energy x-ray beams, considerable progress was made during the postwar years toward developing higher-voltage machines. The major problem at that time was insulating the high-voltage transformer. It soon became apparent that conventional transformer systems were not suitable for producing potential much above 300 kVp. However, with the rapidly advancing technology of the times, new approaches to the design of high-energy machines were found.
The Physics of Radiation Therapy by Faiz M. Khan PhD, John P. Gibbons PhD