نتایج جستجو برای: photon energy

تعداد نتایج: 722810  

Journal: :Annual Review of Nuclear and Particle Science 1990

H.A. Nedaie, Kh. Asnaashari, M. Allahverdi, M. Yarahmadi, O.A. Sauer,

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: :iranian journal of medical sciences 0
b. forogh a. ghasemzadeh a. salimzadeh

the objective of this study was to validate the use of bone mineral measurements of the calcaneus bone by dual x-ray and laser (dxl) in a cross-sectional study carried out in an osteoporosis clinic. measurements of bone mineral density (bmd) at proximal femur and spine were obtained by dual-energy photon x-ray absorptiometry (dexa). osteoporosis was defined by a dexa t-score <-2.5 at the femora...

Journal: :Physics in Medicine and Biology 2011

Journal: :The Journal of Physical Chemistry Letters 2017

Journal: :Proceedings of the ACM on Computer Graphics and Interactive Techniques 2018

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