Results 161 to 170 of about 4,735 (211)

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.
R, Gotanda, T, Katsuda, T, Gotanda, M, Eguchi, S, Takewa, A, Tabuchi, H, Yatake   +6 more
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Directional dependence in film dosimetry: radiographic and radiochromic film

Physics in Medicine and Biology, 2001
The 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 ...
N, Suchowerska, P, Hoban, M, Butson, A, Davison, P, Metcalfe   +4 more
openaire   +2 more sources

New developments in radiochromic film dosimetry

Radiation Protection Dosimetry, 2006
NIST 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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Radiochromic Dye Film Studies for Brachytherapy Applications

Radiation Protection Dosimetry, 2002
Commercial radiochromic dye films have been used in recent years to quantify absorbed dose in several medical applications. In this study we present the characterisation of the GafChromic MD-55-2 dye film, a double sensitive layer film suitable for photon irradiation in brachytherapy applications. Dose measurements were carried out with a low dose rate
A, Martínez-Dávalos, M, Rodríguez-Villafuerte, R, Díaz-Perches, S, Arzamendi-Pérez   +3 more
openaire   +2 more sources

Optimizing the recalibration process in radiochromic film dosimetry

Physics in Medicine & Biology, 2020
Intra-lot, inter-scan and other variabilities in radiochromic film dosimetry may have a severe impact on absolute dosimetry with this dosimeter. In the literature, several dosimetry protocols may be found characterized by different calibration functions and different film response variables.
Carmen Ruiz-Morales, Juan Antonio Vera-Sánchez, Antonio González-López   +2 more
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Dosimetric characteristics of an improved radiochromic film

Medical Physics, 1996
Recently, a new model of radiochromic film has been developed for medical applications to provide a higher sensitivity and better uniformity of response than existing models (i.e., MD-55). Dosimetric characteristics including sensitivity, linearity, reproducibility, uniformity, and dependence on energy and time have been studied experimentally.
A S, Meigooni, M F, Sanders, G S, Ibbott, S R, Szeglin   +3 more
openaire   +2 more sources

Dosimetry of blood irradiation with radiochromic film

Transfusion Medicine, 1999
It has been shown that radiochromic film is an ideal dosimeter for assessment and verification of delivered dose to irradiated blood products. Using a parallel opposing two‐field technique on a medical linear accelerator, blood is irradiated to diminish the risk of transfusion‐associated graft vs. host disease (TA‐GVHD).
M J, Butson, P K, Yu, T, Cheung, M G, Carolan, K Y, Quach, A, Arnold, P E, Metcalfe   +6 more
openaire   +2 more sources

Verification of brachytherapy dosimetry with radiochromic film

Medical Dosimetry, 1999
The 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 ...
W, Schumer, W, Fernando, M, Carolan, T, Wong, S, Wallace, G, Quong, M, Geso   +6 more
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Radiochromic properties of α–terthiophene–cellulose triacetate films

Radiation Physics and Chemistry, 2000
An a-terthiophene/cellulose triacetate ®lm system exposed to g-rays and electron beam shows two new bands in the visible region of the spectrum. The absorbance at 490 nm is almost stable for a long time and responds linearly to the dose applied up to 400 kGy. A second band developed at 700 nm depends on dose rate and may indicate a chain-growth.
Emmi S. S., Ceroni P., Lavalle M., Fuochi P. G., D'Angelantonio M., Alberti A., MacCiantelli D., Kovacs A., Takacs E.   +8 more
openaire   +4 more sources

Use of a control film piece in radiochromic film dosimetry

Physica Medica, 2016
Radiochromic 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
Saad Aldelaijan, Faisal Alzorkany, Belal Moftah, Ivan Buzurovic, Jan Seuntjens, Nada Tomic, Slobodan Devic   +6 more
openaire   +2 more sources