Results 231 to 240 of about 2,244,912 (267)
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Commissioning and evaluation of a radiochromic EBT3 film dosimetry system
Journal of Radiotherapy in Practice, 2018Purpose This work reports our study to commission a radiochromic film dosimetry system using the timely EBT3 film. We carried out dosimetric evaluations on different characteristics of photon beams (e.g., flatness, symmetry and penumbra) in radiation ...
Muhammad Isa khan +8 more
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Polaroid Film in Radiation Dosimetry and Survey
Radiology, 1971Abstract The authors initiated a study of the use of Polaroid films in radiation dosimetry and surveys; in particular, the response of various types of Polaroid films to radiation output from different sources. A good correlation was found between the readings from a Victoreen R-chamber and from Polaroid film, regardless of whether a 300 kVp machine or
S. Stefani, H. Levan, S. J. Hage
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Verification of brachytherapy dosimetry with radiochromic film
Medical Dosimetry, 1999The aim of this work is to empirically validate the optimized dose distribution calculated by the Nucletron Brachytherapy Planning System (v. 13.3) at a distance of 1.0 cm from a stepping source of high-dose-rate-iridium 192 (192Ir). The longitudinal dose distribution at 1.0 cm from a straight pathway of multiple-source positions is measured using ...
T Wong +6 more
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A prototype quantitative film scanner for radiochromic film dosimetry
Medical Physics, 2008We have developed a high resolution, quantitative, two-dimensional optical film scanner for use with a commercial high sensitivity radiochromic film (RCF) for measuring single fraction external-beam radiotherapy dose distributions. The film scanner was designed to eliminate artifacts commonly observed in RCF dosimetry. The scanner employed a stationary
M Ranade +5 more
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Directional dependence in film dosimetry: radiographic and radiochromic film
Physics in Medicine and Biology, 2001The trend towards conformal, intensity modulated radiotherapy treatments has established the need for a true integrating dosimeter. In traditional radiotherapy, radiographic film dosimetry is commonly used. The accuracy and reproducibility of film optical density as an indicator of dose is influenced by several variables, including the chemical ...
P W Hoban +4 more
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Gafchromic EBT film dosimetry in proton beams
Physics in Medicine and Biology, 2010The depth dose verification of active scanning proton beams is extremely time consuming with ion chamber measurements for beam data commissioning and patient specific measurements. With widespread use of Gafchromic EBT films, two-dimensional high-resolution dosimetry is explored in a uniform scanning proton beam.
Li Zhao, Indra J. Das
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New developments in radiochromic film dosimetry
Radiation Protection Dosimetry, 2006NIST has been a pioneer in the use of radiochromic film for medical dosimetry applications. Beginning in 1988 with experiments with (90)Sr/Y ophthalmic applicators, this work has continued into the present. A review of the latest applications is presented, which include high activity low-energy photon source dosimetry and ultra-high resolution film ...
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On the characterization and uncertainty analysis of radiochromic film dosimetry
Medical Physics, 2009Radiochromic film is a dosimeter of choice in applications requiring high spatial resolution, two dimensional measurements, or minimum perturbation of the beam fluence. Since the measurement uncertainty in Gafchromic film dosimetry is thought to be significant compared to that of ionization chambers, a rigorous method to evaluate measurement ...
Bouchard, Hugo +4 more
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Exit dose measurements by portal film dosimetry
Radiotherapy and Oncology, 1993Portal in vivo dosimetry is a very attractive tool for patient dose measurements because of the large amount of information that portal film systems can easily collect, once positioned at the exit surface of the patient. The first step in the verification of the reliability of portal films as in vivo dosimeters is the evaluation of the agreement ...
Barbara Longobardi +6 more
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A method for multichannel dosimetry with EBT3 radiochromic films
Medical Physics, 2014An improved method for multichannel dosimetry is presented. This method explicitly takes into account the information provided by the unexposed image of the film.The method calculates the dose by applying a couple of perturbations to the scanned dose, one dependent and the other independent on the color channel.
Luis Isaac Ramos Garcia +2 more
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