نتایج جستجو برای: film dosimetry

تعداد نتایج: 98429  

Journal: :iranian journal of radiation research 0
m. yarahmadi kurdistan university of medical sciences, sanandaj, iran h.a. nedaie department of medical physics , faculty of medicine, tehran university of medical sciences, tehran, iran m. allahverdi department of medical physics , faculty of medicine, tehran university of medical sciences, tehran, iran kh. asnaashari department of radiotherapy , cancer institute, tehran university of medical sciences, tehran, iran o.a. sauer klinik und poliklinik für strahlentherapie, university of würzburg, josef-schneider-strasse 11, 97080 würzburg, germany

background: small photon fields are increasingly used in modern radiotherapy especially in intensity modulated radiation therapy (imrt) and stereotactic radiosurgery (srs) treatments. accurate beam profile and central axis depth doses measurements of such beams are complicated due to the electron disequilibrium. hence the ebt2 (external beam therapy) gafchromic film was used for dosimetry of sm...

Journal: :Radiotherapy and Oncology 2019

Journal: :Physics in medicine and biology 2007
R P Srivastava C De Wagter

Radiographic or silver halide film is a well-established 2D dosimeter with an unquestioned spatial resolution. But its higher sensitivity to low-energy photons has to be taken into consideration. Metal compensators or physical modulators to deliver intensity modulated radiation therapy (IMRT) are known to change the beam energy spectrum and to produce scattered photons and contaminating electro...

Journal: :iranian journal of medical physics 0
ali aghaebrahimian department of physics, isfahan university of technology, isfahan, iran mohammad hassan alamatsaz department of physics, isfahan university of technology, isfahan, iran

introduction the gamma knife system is designed solely for non-invasive treatment of brain disorders, and it benefits from stereotactic surgical techniques. dose calculations required in the system are performed by gammaplan code; in this code, brain tissue is considered uniform. in the present study, we evaluated the effect of gamma knife system on the obtained dose through simulating a real h...

2012
Hani Alnawaf Peter K.N. Yu Martin Butson

Epson Desktop scanners have been quoted as devices which match the characteristics required for the evaluation of radiation dose exposure by radiochromic films. Specifically, models such as the 10000XL have been used successfully for image analysis and are recommended by ISP for dosimetry purposes. This note investigates and compares the scanner characteristics of three Epson desktop scanner mo...

2006
E. O ' Shea P. McCavana

Several instruments have been used to measure absorbed radiation dose under non-electronic equilibrium conditions, such as in the build-up region or near the interface between two different media, including the surface." Many of these detectors are discussed in this paper. A common method of measuring the absorbed dose distribution and electron contamination in the build-up region of high-energ...

Journal: :iranian journal of nuclear medicine 1995
h mohammadi s mehdizadeh sh derakhshan

an extensive study was undertaken to investigate on the overall film badge service performance with which occupational radiation, exposures are reported in iran, the study involved the analysis of film badges exposed to x-and gamma rays and beta particles. for test exposures, x-rays between 60 and 140 kvpco-60 gamma radiation and sr-90 beta particles were used. the actual delivered dose equival...

2012
Mahdi Ghorbani Mohammad Taghi Bahreyni Toossi Ali Asghar Mowlavi Shahram Bayani Roodi Ali Soleimani Meigooni

UNLABELLED BACKGROUND.: The aim of this study is to evaluate the performance of a color scanner as a radiochromic film reader in two dimensional dosimetry around a high dose rate brachytherapy source. MATERIALS AND METHODS A Microtek ScanMaker 1000XL film scanner was utilized for the measurement of dose distribution around a high dose rate GZP6 (60)Co brachytherapy source with GafChromic® EBT...

2001
Christopher T. Baird George Starkschall H. Helen Liu Thomas A. Buchholz Kenneth R. Hogstrom

The accuracy of the photon convolution/superposition dose algorithm employed in a commercial radiation treatment planning system was evaluated for conditions simulating tangential breast treatment. A breast phantom was fabricated from machineable wax and placed on the chest wall of an anthropomorphic phantom. Radiographic film was used to measure the dose distribution at the axial midplane of t...

2017
Davide Cusumano Maria Luisa Fumagalli Francesco Ghielmetti Linda Rossi Giuliano Grossi Raffaella Lanzarotti Laura Fariselli Elena De Martin

Gafchromic EBT3 film dosimetry in radiosurgery (RS) and hypofractionated radiotherapy (HRT) is complicated by the limited film accuracy at high fractional doses. The aim of this study is to develop and evaluate sum signal (SS) film dosimetry to increase dose resolution at high fractional doses, thus allowing for use of EBT3 for dose distribution verification of RS/HRT treatments. To characteriz...

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