نتایج جستجو برای: head phantom
تعداد نتایج: 183965 فیلتر نتایج به سال:
BACKGROUND A major motivation in designing the new infant and child magnetoencephalography (MEG) system described in this manuscript is the premise that electrophysiological signatures (resting activity and evoked responses) may serve as biomarkers of neurodevelopmental disorders, with neuronal abnormalities in conditions such as autism spectrum disorder (ASD) potentially detectable early in de...
This study is designed to accurately simulate a helical CT-scanner for the purpose of estimating radiation dose and to perform validation experiments involving several dose profile and ionization chamber measurements. To accomplish this we have modified a general purpose Monte Carlo transport code (MCNP4B) as the framework for simulating the x-ray source and its movement, photon transport and r...
PURPOSE Multimodality imaging has become an important adjunct of state-of-the-art radiation therapy (RT) treatment planning. Recently, simultaneous PET/MR hybrid imaging has become clinically available and may also contribute to target volume delineation and biological individualization in RT planning. For integration of PET/MR hybrid imaging into RT treatment planning, compatible dedicated RT ...
The aim of this study was to develop and apply an evaluation method for assessing the accuracy a novel 3D EPID back-projection algorithm in vivo dosimetry. Dosimetry Check (DC) 5.8 evaluated. A slab phantom homogeneously filled, or with air bone inserts, used fluence reconstruction different squared fields. VMAT plans anatomical sites were delivered on anthropomorphic phantom. Dose distribution...
In this paper we deal with a simplified anisotropic rat head phantom development and the investigation of influence white matter on electroencephalogram source localization. The proposed is based cubic cross cell composition combined agar mixture to set desired electrical conductivity ratio. For fabrication phantom, 3D printed technology exploited. Starting from real brain, brain model incorpor...
Introduction: International Commission on Radiological Protection introduced three basic principles of radiation protection, namely justification, optimization, and dose limit. Medical exposure has no dose limits, and generally, diagnostic reference levels are used as a tool for optimization of patient protection. Material and Methods: Dosimetry was performed on 20 CT scanners located in 14 cit...
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