نتایج جستجو برای: photon energy
تعداد نتایج: 722810 فیلتر نتایج به سال:
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...
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...
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