نتایج جستجو برای: gafchromic xrct

تعداد نتایج: 399  

Journal: :Physics in medicine and biology 2006
Martin J Butson Tsang Cheung Peter K N Yu

Gafchromic XRCT radiochromic film is a self-developing high sensitivity radiochromic film product which can be used for assessment of delivered radiation doses which could match applications such as computed tomography (CT) dosimetry. The film automatically changes colour upon irradiation changing from a yellow to green/brown colour. The absorption spectra of Gafchromic XRCT radiochromic film a...

2008
Hiroko Ohuchi Mitsuya Abe

Gafchromic XRCT radiochromic film is a self-developing high sensitivity radiochromic film product which can be used for assessment of delivered radiation doses which could match applications such as computed tomography (CT) dosimetry. The film automatically changes color upon irradiation changing from amber to dark greenish-black depending on the level of exposure. The absorption spectra of Gaf...

Journal: :iranian journal of science and technology (sciences) 2008
m. j. butson

– gafchromic xrct radiochromic film is a self developing high sensitivity radiochromic filmproduct which can be used for assessment of delivered radiation doses which could match applications suchas computed tomography (ct) dosimetry. the dose response of gafchromic xrct radiochromic film hasbeen measured with reflectance spectrophotometry and desktop scanners. the film automatically changescol...

Journal: :Medical physics 2006
Martin J Butson Tsang Cheung Peter K N Yu

Gafchromic XRCT, radiochromic film is assessed over a broad energy range, from kilovoltage to megavoltage x rays for variations in reflected optical density to dose response. A large energy dependence was found with reflected optical density output for the same delivered dose varying from 7.8±0.35 at 25.5keV (50kVp) peaking at 12.1±0.5 at 54keV (125kVp) to 0.975±0.03 at 2300keV (10MV) when norm...

Journal: :Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine 2011
S Vandana V S Shaiju S D Sharma S Mhatre S Shinde G Chourasiya Y S Mayya

Gafchromic films are increasingly being used for dosimetry in medical and industrial applications of ionizing radiation because of their favorable characteristics such as self developing in nature, easy to handle, dose rate independent response, insensitivity to normal room lights, high resolution and insensitivity to variation in the environment conditions. The dosimetry measurements using Gaf...

2015
Toshizo Katsuda Rumi Gotanda Tatsuhiro Gotanda Takuya Akagawa Nobuyoshi Tanki Tadao Kuwano Kouichi Yabunaka

Gafchromic film has been used for X-ray dose measurement in diagnostic examinations. Their use has been initiated for three-dimensional X-ray dose measurement by using the high-resolution characteristics of Gafchromic films in computed tomography. However, it is necessary to solve the problem of nonuniform thickness in the active layers of Gafchromic films. A double exposure technique using X-r...

2016
Toshizo Katsuda Rumi Gotanda Tatsuhiro Gotanda Takuya Akagawa Nobuyoshi Tanki Tadao Kuwano Kouichi Yabunaka

This study investigates an X-ray dose measurement method for computed tomography using Gafchromic films. Nonuniformity of the active layer is a major problem in Gafchromic films. In radiotherapy, nonuniformity error is reduced by applying the double-exposure technique, but this is impractical in diagnostic radiology because of the heel effect. Therefore, we propose replacing the X-rays in the d...

2015
Toshizo Katsuda Rumi Gotanda Tatsuhiro Gotanda Takuya Akagawa Nobuyoshi Tanki Tadao Kuwano Kouichi Yabunaka

Gafchromic films are used for X-ray dose measurements during diagnostic examinations and have begun to be used for three-dimensional X-ray dose measurements using the high-resolution characteristics of Gafchromic films for computed tomography. However, the problem of unevenness in Gafchromic film active layers needs to be resolved. Double exposures using X-rays are performed during therapeutic ...

Journal: :Journal of materials research and technology 2023

This work aims to present an XRCT-based FEM methodology assess the influence of porosity defects on mechanical behavior and failure L-PBF AlSi10Mg components. Hence, performance is estimated by means XRCT scanning analysis features, followed modelling digitalized For this purpose, some test specimens with induced artificial were manufactured L-PBF, according ASTM E8/E8M. Once done, inspection d...

2017
Toshizo Katsuda Rumi Gotanda Tatsuhiro Gotanda Takuya Akagawa Nobuyoshi Tanki Tadao Kuwano Atsushi Noguchi Kouichi Yabunaka

Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it is unclear whether the chemical color change of Gafchromic films affects the UV-A transmission int...

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