نتایج جستجو برای: mr model
تعداد نتایج: 2161828 فیلتر نتایج به سال:
سابقه و هدف: تأثیر پارامترهای مختلف بافتی ( t 1 ، t 2 و دانسیته پروتونی) در ایجاد کنتراست تصاویر متداول mri ( magnetic resonance imaging ) ، گاهی اوقات باعث نامرئی و غیرقابل تشخیص شدن بعضی از ضایعات به خصوص ضایعات کوچک در ماده سفید ظاهراً طبیعی بیماران مبتلا به مالتیپل اسکلروزیس ( ms ) می گردد. با توجه به اینکه هر یک از بافت های مختلف مغز دارای t 1 و t 2 خاص خود می باشند و در اثر ضایعات متفاوت ا...
MR-only radiotherapy treatment planning requires accurate MR-to-CT synthesis. Current deep learning methods for MR-to-CT synthesis depend on pairwise aligned MR and CT training images of the same patient. However, misalignment between paired images could lead to errors in synthesized CT images. To overcome this, we propose to train a generative adversarial network (GAN) with unpaired MR and CT ...
introduction: fragile x syndrome (fxs) is one of the most prevalent genetic causes of developmental disability, representing the most frequent form of inherited severe cognitive deficit. the present study was undertaken to investigate fxs and its prevalence in moderate mentally retarded people in patients. materials and methods: nineteen people with moderate mental retardation (mr) who were cli...
سابقه و هدف: تزریق واکسن سرخک - سرخجه (mr) به خانم باردار ممنوع است و توصیه شده بعد از تزریق mr تا 3 ماه، حاملگی صورت نگیرد. از طرفی ابتلا مادر باردار یا در معرض قرار گرفتن او نیز در برابر این بیماری ها، پیامدهایی را در بر داشته است. لذا با توجه به اجرای طرح کشوری تزریق mr به افراد زیر 25 سال، بررسی فراوانی پیامدها و ناهنجاری های مادرزادی در نوزادان متولد شده از مادران واکسینه شده در طول اجرای ...
Introduction: Nowadays, magnetic resonance imaging (MRI) in combination with computed-tomography (CT) is increasingly being used in radiation therapy planning. MR and CT images are applied to determine the target volume and calculate dose distribution, respectively. Since the use of these two imaging modalities causes registration uncertainty and increases department w...
The adsorption ability of Dowex Optipore L493 resin modified with Aliquat 336 (MR), activated carbon modified with Aliquat 336 (MAC) and sawdust modified with Aliquat 336 (MS) for removal of Cr(VI) from aqueous solution in batch system was investigated. The effects of operational parameters such as adsorbent dosage, initial concentration of Cr(VI) ions, pH, temperature and contact time were stu...
abstract the present study was conducted to investigate the effect of using model essays on the development of writing proficiency of iranian pre-intermediate efl learners. to fulfill the purpose of the study, 55 pre- intermediate learners of parsa language institute were chosen by means of administering proficiency test. based on the results of the pretest, two matched groups, one as the expe...
In the present work, an experimental investigation on wire electrical discharge machining (WEDM) of Monel-400 has been presented. Monel-400 is a nickel–copper-based alloy, mostly employed in ships and corrosion-resisting applications. Four input WEDM parameters namely discharge current (Ip), pulse-on time (Ton), pulse-off time (Toff) and servo voltage (SV) have been investigated and modeled for...
This article presents numerical studies on semi-active seismic response control of structures equipped with Magneto-Rheological (MR) dampers. A multi-layer artificial neural network (ANN) was employed to mitigate the influence of time delay, This ANN was trained using data from the El-Centro earthquake. The inputs of ANN are the seismic responses of the structure in the current step, and the ou...
Multi-domain unified modeling and simulation of semi- active suspension in magnerorheological damper
In order to build high-precision and highefficient MR damper system model, a multi-domain unified modeling method was proposed. Firstly, based on the analysis of a MR damper semi-active suspension system model, various fields of MR, such as structure, magnetic field, control and mechanics, were studied to find the main influencing parameters. And then for the multi-domain coupling characteristi...
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