Results 201 to 210 of about 113,186 (233)
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ESR/alanine dosimetry of high-energy electrons in radiotherapy
International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 1989Abstract Dosimetry with detectors of organic material and electron spin resonance (ESR) spectroscopy for readout has been developed metrologically at GSF for high-level photon radiation. The tissue-equivalent probes also appear appropriate for therapy-level dosimetry.
A. Wieser +7 more
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Photoneutron production in tissue during high energy bremsstrahlung radiotherapy
Physics in Medicine and Biology, 1988The total yield of photoneutrons from soft-tissue-equivalent material irradiated with bremsstrahlung of end-point energy from 6 to 28 MeV has been measured using the 35 MeV University of Melbourne Betatron and a 4 pi Halpern-type neutron detector. The results are compared with calculations based on the cross sections for neutron production of the ...
P D Allen, M A Chaudhri
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High energy electron radiotherapy in a magnetic field
Medical Physics, 1975We propose the use of high energy electrons in a strong local magnetic field as the ionizing beam in radiation therapy. A high kinetic energy insures that the electrons will penetrate to deep-seated tumor masses. A high magnetic field of several tesla in the region encompassing the tumor will confine the high energy electrons to the tumor volume before
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DESIGN OF X-RAY TARGETS FOR HIGH ENERGY LINEAR ACCELERATORS IN RADIOTHERAPY
American Journal of Roentgenology, 1974The 25 MeV electron beam was extracted from a Varian Clinac-35 linear accelerator and made to produce x-rays in thick targets of different materials. The x-ray beams were flattened by filters of various materials.We have found that an aluminum thick target gives a more penetrating beam in the forward direction than does a lead or tungsten target.The x ...
J. A. Rawlinson +3 more
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Low- versus High-Energy Photon Beams in Radiotherapy for Lung Cancer
Medical Dosimetry, 1993This retrospective study analyzed the outcome of lung cancer patients who were treated with either 4-MV or 10-MV photons. From October 1979 through December 1982, 126 patients with locally advanced, unresectable or medically inoperable, nonmetastatic non-small cell lung cancer were treated in a prospective trial in which they were randomly assigned to ...
Duane M. Ilstrup +6 more
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Treatment planning consideration for very high-energy electron FLASH radiotherapy
Physica Medica, 2023Very high-energy electron (VHEE) can make up the insufficient treatment depth of the low-energy electron while offering an intermediate dosimetric advantage between photon and proton. Combining FLASH with VHEE, a quantitative comparison between different energies was made, with regard to plan quality, dose rate distribution (both in PTV and OAR), and ...
Guoliang, Zhang +3 more
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Radiobiological Properties of High—Energy Cyclotron-Produced Neutrons Used for Radiotherapy
Radiology, 1975Radiobiological properties of high-energy cyclotron-produced neutrons were investigated. The survival curve for mammalian cells exposed to 35 MeV neutrons has an appreciable shoulder, but exhibits a significant initial slope at low doses. split-dose experiments, using doses comparable to the daily fractions of neutron therapy, indicate no repair of ...
Richard B. Theus +3 more
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On the beam quality specification of high‐energy photons for radiotherapy dosimetry
Medical Physics, 2000An overview of common photon beam quality specifiers used in radiotherapy dosimetry introduces a reasoned discussion on the advantages and disadvantages ofandIt is shown that some of the potential advantages ofare also present in other well known beam quality specifiers such asHowever, all PDD‐based beam quality indices, includingare subject to ...
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Spectra of photoneutrons produced by high-energy X-ray radiotherapy linacs
Radiation Protection Dosimetry, 2008Spectral fluence of photoneutrons generated in the head of the radiotherapeutic linac Varian 2100 C/D was measured by means of the Bonner spheres spectrometer whose active detector of thermal neutrons was replaced by a track detector, i.e. a sandwich of four CR-39s with the boron radiator inserted between them.
K. Turek, V. Vondracek, M. Králík
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Investigation of photoneutron dose equivalent from high-energy photons in radiotherapy
Applied Radiation and Isotopes, 2007Spatial distribution of photoneutron dose equivalent during radiotherapy at different beam size, depth, and distance from a 15 MV linear accelerator was investigated with bubble detectors in a water phantom. The photoneutron dose equivalent was mainly from fast neutrons, and decreased with distance at a fixed field and with depth. Besides, photoneutron
Lin, Chun-Chih +2 more
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