Journal ArticleDOI
Characteristics of photon beams from Philips SL25 linear accelerators
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TLDR
The Philips SL25 accelerator is a multimodality machine offering asymmetric collimator jaws and a new type of beam bending and transport system that produces photon beams and a scattered electron beam with nine selectable energies between 4 and 22 MeV.Abstract:
The Philips SL25 accelerator is a multimodality machine offering asymmetric collimator jaws and a new type of beam bending and transport system. It produces photon beams, nominally at 6 and 25 MV, and a scattered electron beam with nine selectable energies between 4 and 22 MeV. Dosimetric characteristics for the 6- and 25-MV photon beams are presented with respect to field flatness, surface and depth dose characteristics, isodose distribution, field size factors for both open and wedged fields, and narrow beam transmission data in different materials.read more
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Journal ArticleDOI
Monte Carlo calculation of nine megavoltage photon beam spectra using the BEAM code
TL;DR: The three photon spectra at 6 MV from the machines of three different manufacturers show differences in their shapes as well as in the efficiency of bremsstrahlung production in the corresponding target and filter combinations.
Journal ArticleDOI
Sensitivity of megavoltage photon beam Monte Carlo simulations to electron beam and other parameters.
TL;DR: The BEAM code is used to simulate nine photon beams from three major manufacturers of medical linear accelerators to derive and evaluate estimates for the parameters of the electron beam incident on the target, and to study the effects of some mechanical parameters like target width, primary collimator opening, flattening filter material and density.
Journal ArticleDOI
Dosimetric properties of megavoltage grid therapy
TL;DR: Characterization of the dosimetric properties has allowed clinical implementation of the megavoltage grid therapy, a unique treatment modality where the dose is delivered differentially to a large volume in one fraction.
Journal ArticleDOI
Linear accelerator output variations and their consequences for megavoltage imaging.
TL;DR: In this article, an experimental study of radiation output intensity fluctuations of a Philips SL25 linear accelerator is presented, where measurements are obtained using an electronic portal imaging device, and the consequences of the measured uctuations for various different applications of megavoltage imaging including portal imaging, transit dosimetry and meg-tome computed tomography ~MVCT! are discussed with examples.
Journal ArticleDOI
Measurements of basic parameters in wedged high-energy photon beams using a mini-phantom.
TL;DR: Basic dosimetric quantities necessary to specify wedged beans (beam quality, wedge factors, output ratios) are obtained by measurements performed in a narrow coaxial mini-phantom for 6, 18 and 15 MV photon beams.