نتایج جستجو برای: mr model
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how to cite this article: oz ii, bozay oz e, şerifoğlu i, kaya n, erdem o. cerebellar infarction in childhood: delayed-onset complication of mild head trauma. iran j child neurol. summer 2016; 10(3):82-85. objective cerebellar ischemic infarction is a rare complication of minor head trauma. vertebral artery dissection, vasospasm or systemic hypo perfusion can cause infarct. however, underlying...
A general statistical model that can describe a rather large number of experimental results related to the structure of the diffusion-attenuated MR signal in biological systems is introduced. The theoretical framework relies on a phenomenological model that introduces a distribution function for tissue apparent diffusion coefficients (ADC). It is shown that at least two parameters--the position...
روش ها و سیستم های گوناگونی برای کنترل سازه ها وجود دارد که شامل کنترل غیر فعال، کنترل فعال و کنترل نیمه فعال سازه می باشد که هوشمنداند و بر تغییرات بارهای دینامیکی وارده قابل انطباق می باشند این سیستم ها دارای خواص مکانیکی متغیر و قابل کنترل هستند. انواع مختلفی از میراگرهای نیمه فعال با خواص مکانیکی قابل کنترل وجود دارد. میراگر mr نوعی میراگر مایع کنترل پذیر است. هنگامی که این مایع در معرض مید...
چکیده زمینه و هدف: ترومبوز وریدهای مغزی (cvt) یک اختلال نادر می باشد. بروز cvt در کشورهای در حال توسعه کاملاً مشخص نیست. این مطالعه با هدف بررسی میزان بروز موارد ترومبوز وریدی مغز ، علائم و برخی عوامل مستعدکننده آن در شهر کرمانشاه انجام گردید. روش بررسی: این مطالعه یک مطالعه توصیفی و حجم نمونه 21 مورد بود. در این مطالعه موارد ترومبوز مغزی تشخیص داده شده بر اساس سکانسهای t1, t2, flair mri و تایید...
This study examines identification of rheological parameters for a constitutive model characterizing the rheological behavior of a ferrous nanoparticle-based magnetorheological (MR) fluid. Particle size is nominally 28 nm and the MR fluid has a weight fraction of 27.5% Fe. A constant shear rate rheometer is used to measure flow curves (shear stress vs. shear rate), as a function of applied magn...
Background/introduction In magnetic resonance guided focused ultrasound (MRgFUS) brain applications the fully insonified field-ofview (FOV) is ideally monitored. This can be achieved by k-space subsampling and using a dedicated reconstruction method, such as the previously described model predictive filtering (MPF) method.[1] MPF utilizes the Pennes Bioheat transfer equation (PBTE) and tissue t...
Bedrock unconfined compressive strength (UCS) is a key parameter in designing thegeosciences and building related projects comprising both the underground and surface rock structures. Determination of rock UCS using standard laboratory tests is a complicated, expensive, and time-consuming process, which requires fresh core specimens. However, preparing fresh cores is not always possible, especi...
OBJECT The aims of this study were to develop a three-dimensional patient-specific finite element (FE) brain model with detailed anatomical structures and appropriate material properties to predict intraoperative brain shift during neurosurgery and to update preoperative magnetic resonance (MR) images using FE modeling for presurgical planning. METHODS A template-based algorithm was developed...
In this paper, the development of a semiactive suspension control of quarter car model using fuzzy-based controller has been done. The quarter car model to be used here can be described as a nonlinear two degrees of freedom system which is subject to excitation from different road profile. The semi-active control is designed as the fuzzy control inferred by using two single input rule fuzzy mod...
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