Results 221 to 230 of about 2,171,676 (258)

On the characterization and uncertainty analysis of radiochromic film dosimetry

Medical Physics, 2009
Radiochromic 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, Lacroix, Frédéric, Beaudoin, Gilles, Carrier, Jean-François, Kawrakow, Iwan   +4 more
openaire   +4 more sources

Radiochromic film as a radiotherapy surface-dose detector

Physics in Medicine and Biology, 1996
Radiochromic film is shown to be a useful surface-dose detector for radiotherapy x-ray beams. Central-axis percentage surface-dose results as measured by Gafchromic film for a 6 MVp x-ray beam produced by a Varian 2100C Linac at 100 cm SSD are 16%, 25%, 35%, 41% for 10, 20, 30 and 40 cm square field sizes, respectively.
Peter E Metcalfe, Martin J Butson, Mathur Jn   +2 more
openaire   +3 more sources

A universal dose–response curve for radiochromic films

Medical Physics, 2015
Purpose:This paper presents a model for dose–response curves of radiochromic films. It is based on a modified version of single‐hit model to take into account the growth experienced by lithium salt of pentacosa‐10,12‐diynoic acid polymers after irradiation.Methods:Polymer growth in radiochromic films is a critical phenomenon that can be properly ...
P. Galán Montenegro, C. Moreno Sáiz, V. Parra Osorio, J. A. Martín-Viera Cueto, F. J. Casado Villalón, F. Navarro Guirado   +5 more
openaire   +3 more sources

Dose response linearization in radiochromic film dosimetry based on multichannel normalized pixel value with an integrated spectral correction for scanner response variations.

Medical Physics (Lancaster), 2019
PURPOSE To introduce a model that reproducibly linearizes the response from radiochromic film (RCF) dosimetry systems at extended dose range. To introduce a correction method, generated from the same scanned images, which corrects for scanner temporal ...
S. Aldelaijan, S. Dević, P. Papaconstadopoulos, H. Bekerat, R. Cormack, J. Seuntjens, Ivan Buzurovic   +6 more
semanticscholar   +1 more source

The repeatability of the scanner in radiochromic film dosimetry

Physica Medica, 2016
Purpose 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, Jenko Aljasa, Casar Bozidar, Mendez Ignasi, Hudej Rihard   +4 more
openaire   +2 more sources

Polarization effects on a high-sensitivity radiochromic film

Physics in Medicine and Biology, 2003
A new high-sensitivity radiochromic film has been tested for its polarization properties. Gafchromic HS film has been shown to produce a relatively small (less than 3%) variation in the optical density measured at 660 nm wavelength when the light source is fully linear polarized and the film is rotated through a 360 angle.
Tsang Cheung, Martin J Butson, Dean Inwood, Peter K.N. Yu   +3 more
openaire   +3 more sources

Dosimetry of biological irradiations using radiochromic films

Physics in Medicine and Biology, 2013
Delivering accurate radiation dose to blood specimens during biological irradiations is essential in quantifying damage of ionizing radiation. To estimate dose to blood samples as accurately as possible, pieces of EBT2 model GAFCHROMIC™ film were placed within an approximately 10 mm finely ground rice layer that was used to simulate test specimens ...
Ghazi Alsbeih, Belal Moftah, I Aldahlawi, Nada Tomic, Slobodan Devic, Ahmad Nobah, A Alzahrany, Saad Aldelaijan   +7 more
openaire   +3 more sources

Computed tomography phantom for radiochromic film dosimetry

Australasian Physics & Engineering Sciences in Medicine, 2007
To evaluate in detail the dose distribution during computed tomography (CT), a sheet roll CT dosimetry phantom (SRCT-P) with a radiochromic film (RF) was experimentally developed. The SRCT-P was made by rolling up a vinyl chloride sheet in a cylindrical shape to arbitrarily select the SRCT-P diameter, dose measurement position, and depth.
S. Takewa, H. Yatake, T. Gotanda, Akihiko Tabuchi, M. Eguchi, T. Katsuda, R. Gotanda   +6 more
openaire   +3 more sources

Spatial resolution of a stacked radiochromic film dosimeter

Radiotherapy and Oncology, 2001
The spatial resolution of stacked radiochromic film dosimeters, which have increased sensitivity from a single layer radiochromic film detector, has been studied.A 5-layer film which can easily be constructed provided a 4.3-times increase in sensitivity over a single layer film at 670 nm readout wavelength which meant that doses as low as 0.6 Gy could ...
Martin J Butson, Tsang Cheung, Peter K.N. Yu   +2 more
openaire   +3 more sources

Assessment of concomitant testicular dose with radiochromic film

Australasian Physical & Engineering Sciences in Medicine, 2013
To assess the suitability of EBT2 and XRQA2 Gafchromic film for measuring low doses in the periphery of treatment fields, and to measure the accumulative concomitant dose to the contralateral testis resulting from CT imaging, pre-treatment imaging (CBCT) and seminoma radiotherapy with and without gonadal shielding.
Katherine Fricker, Katherine Fricker, Christine Thompson, Juergen Meyer, Juergen Meyer   +4 more
openaire   +3 more sources