Results 141 to 150 of about 18,198 (165)
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Use of a control film piece in radiochromic film dosimetry
Physica Medica, 2016Radiochromic films change their color upon irradiation due to polymerization of the sensitive component embedded within the sensitive layer. However, agents, other than monitored radiation, can lead to a change in the color of the sensitive layer (temperature, humidity, UV light) that can be considered as a background signal and can be removed from the
Nada Tomic +8 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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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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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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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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The repeatability of the scanner in radiochromic film dosimetry
Physica Medica, 2016Purpose The repeatability of the scanner EPSON 10000 XL in radiochromic film dosimetry was studied. Several patterns were observed and analyzed. Methods The dispersion of the measures of the scanner as a function of the pixel position was calculated for resolutions 50, 72, 96 and 150 dpi.
Sljivic Zeljko +4 more
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A radiochromic dye film for UV dosimetry
Journal of Photochemistry and Photobiology A: Chemistry, 1992Abstract A mixture of colourless new fuchsin dye and sandolan yellow dye was incorporated into a thin film of poly(vinyl alcohol) polymer to form a yellow UV radiation dosimeter which changed to red when exposed to UV radiation. The depth of the red colour was dependent solely on the radiant exposure.
A. A. Abdel Fattah +2 more
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Gafchromic® EBT films for ion dosimetry
Radiation Measurements, 2010Abstract For dose delivery to patients, scanning ion beams are going to be increasingly used in the upcoming ion beam therapy facilities. Especially carbon ion beams are able to produce steep dose gradients. However, the currently used method for patient dose verification, employing ionization chamber arrays, provides a spatial resolution of 1 cm ...
Oliver Jäkel +2 more
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