نتایج جستجو برای: scatter dose

تعداد نتایج: 321996  

Journal: :Chinese Physics 2021

A algorithm of obtaining absolute dose at each tissue depth only by the mathematical calculation formula is reported. The based on integrating energy flux electron generated X-ray in range irradiation field, and spectrum ray secondary scattered are considered this process. In algorithm, water phantom field divided into several thin layers, electrons interaction between layer reaching point calc...

Afshin Akbarzadeh Hossein Ghadiri, Mohammad Rreza Ay, Saied Sarkar

Introduction: One of the most important parameters in x-ray CT imaging is the noise induced by detected scattered radiation. The detected scattered radiation is completely dependent on the scanner geometry as well as size, shape and material of the scanned object. The magnitude and spatial distribution of the scattered radiation in x-ray CT should be quantified for development of robust scatter...

Journal: :basic and clinical cancer research 0
alireza mohammadkarim department of engineering, science and research branch, islamic azad university, tehran, iran mahmoud allahverdi department of medical physics, tehran university of medical science, tehran, iran mahbod esfehani radiotherapeutic oncology department of cancer institute hasanali nedaie department of radiotherapy, tehran university of medical science, tehran, iran alireza shirazi department of medical physics, tehran university of medical science, tehran, iran

background: delivering the maximum dose to tumor while achieving the minimum dose delivery to normal tissue; is the most important goal in external radiotherapy. diode in vivo dosimetry is widely considered to be an important tool for quality improvement of patient care in external radiotherapy. uncertainty in dose delivery should fall within 5% of the prescribed dose as recommended by internat...

Journal: :Medical physics 2006
Markus Wendling Robert J W Louwe Leah N McDermott Jan-Jakob Sonke Marcel van Herk Ben J Mijnheer

The use of electronic portal imaging devices (EPIDs) is a promising method for the dosimetric verification of external beam, megavoltage radiation therapy-both pretreatment and in vivo. In this study, a previously developed EPID back-projection algorithm was modified for IMRT techniques and applied to an amorphous silicon EPID. By using this back-projection algorithm, two-dimensional dose distr...

2015
M. C. Veale M. D. Wilson J. Scuffham

This project uses the combination of a spectroscopic detector and a monochromator to produce scatter free images for use in mammography. Reducing scatter is vital in mammography, where typical structures have either low contrast or small dimensions. The typical method to reduce scatter is the anti-scatter grid, which has the drawback of absorbing a fraction of the primary beam as well as scatte...

Journal: :Journal of vascular and interventional radiology : JVIR 2010
Raymond H Thornton Lawrence T Dauer Joaquin P Altamirano Keith J Alvarado Jean St Germain Stephen B Solomon

PURPOSE To evaluate the impact of common radiation-shielding strategies, used alone and in combination, on scattered dose to the fluoroscopy operator's eye. MATERIALS AND METHODS With an operator phantom positioned at the groin, upper abdomen, and neck, posteroanterior low-dose fluoroscopy was performed at the phantom patient's upper abdomen. Operator lens radiation dose rate was recorded wit...

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