نتایج جستجو برای: entrance skin dose
تعداد نتایج: 502414 فیلتر نتایج به سال:
The aim of this review was to develop a radiographic optimisation strategy to make use of digital radiography (DR) and needle phosphor computerised radiography (CR) detectors, in order to lower radiation dose and improve image quality for paediatrics. This review was based on evidence-based practice, of which a component was a review of the relevant literature. The resulting exposure chart was ...
The purpose of the present study is to evaluate the uncertainties of in vivo dosimetry measured with diode detectors for conformal radiation therapy techniques in order to define appropriate tolerance levels for pelvis and breast treatment in MEIH (Middle East Institute of Health). The present work is carried out on 30-472 and 30-473 diode detectors irradiated by 4 and 15MV photon beams of a me...
background: boron neutron capture therapy (bnct) is a radiotherapy that combines biological targeting and high linear energy transfer. a potential therapeutic approach for non-small cell lung cancer (nsclc) is considered. however, dose in lung tumor is not homogeneous, and it will reduce the effect of bnct treatment. in order to improve the dose distribution of bnct, the multi-field irradiation...
Background and purpose: In-vivo dosimetry is used to ensure accurate delivery of dose to tumors during radiotherapy. This study aimed at measuring the entrance doses without the build-up cap for patients undergoing 15MV radiotherapy and determining the percentage errors between doses measured by films and those calculated with a treatment planning system (TPS). Materials and methods: The stu...
This study presents the results from a survey conducted by the Greek Atomic Energy Commission (GAEC), during the period 1998-2003, in 530 public and private owned fluoroscopic X-ray systems in Greece. Certain operational parameters for conventional and remote control systems were assessed, according to a quality control protocol developed by GAEC on the basis of the current literature. Public (...
Introduction: In the last few decades, a lot of monte carlo codes have been introduced for medical applications. For close - to - surface tumors, the surface of the skin can be used to increase the surface dose so that all or part of the bunch area can fall into bolus, thereby increasing the dose of the skin. The air gaps between bolus and skin can affect the dose of...
The present study examines the associations between tactical performance indexes with quality of tactical behaviours and birth-date quarters of youth Soccer players. The sample comprised a total of 534 youth players classified into four seasons of 3 months (January-March; April-June; July-September; October-December). A system of tactical assessment in Soccer (FUT-SAT) was used to collect data....
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