EP-1160: Absolute dosimetry with EBT2: double channel calibration and empirical crossplane correction
نویسندگان
چکیده
منابع مشابه
Correction of nonuniformity error of Gafchromic EBT2 and EBT3
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...
متن کاملEvaluation of triple channel correction acquisition method for radiochromic film dosimetry
The purpose of this study was to evaluate the triple channel correction acquisition (TCCA) method for radiochromic film dosimetry performed with a flatbed scanner. The study had two parts: a fundamental and a clinical examination. In the fundamental examination, we evaluated the accuracy of calibration curves for Gafchromic EBT2 (EBT2). The films were calibrated using a field-by-field method wi...
متن کاملAbsolute Calibration of PMTs with Laser light
We report on the results from calibrating photo-multiplier tubes (PMTs) absolutely. Obtaining the quantum efficiency measurements of PMTs to better than 10% is very difficult, but this level of accuracy is necessary to make an absolute measurement of cosmic ray air shower fluorescence yield. As a calibration light source we use photons from a 337.1 nm nitrogen laser passed through an integratin...
متن کاملSmall photon field dosimetry using EBT2 Gafchromic film and Monte Carlo simulation
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...
متن کاملA study of surface dosimetry for breast cancer radiotherapy treatments using Gafchromic EBT2 film
The present study quantified surface doses on several rectangular phantom setups and on curved surface phantoms for a 6 MV photon field using the Attix parallel-plate chamber and Gafchromic EBT2 film. For the rectangular phantom setups, the surface doses on a homogenous water equivalent phantom and a water equivalent phantom with 60 mm thick lung equivalent material were measured. The measureme...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Radiotherapy and Oncology
سال: 2013
ISSN: 0167-8140
DOI: 10.1016/s0167-8140(15)33466-6