نتایج جستجو برای: enhancement ratio

تعداد نتایج: 621077  

Journal: :AJNR. American journal of neuroradiology 1994
K H Chang D G Ra M H Han S H Cha H D Kim M C Han

PURPOSE To compare the degree of MR contrast enhancement of 0.5 T and 2.0 T in various brain tumors. METHODS MR images were studied prospectively in each of 31 patients with brain tumors (11 gliomas, 6 meningiomas, 6 neurinomas, and 8 others) before and after intravenous injection of gadopentetate dimeglumine. In every patient, both 0.5-T and 2.0-T MR studies were done within 1 week. Each pat...

Journal: :international journal of nanoscience and nanotechnology 2014
e. esmaeili a. m. rashidi kh. jafari-jozani

in the present study, ptruce/mwnts nanocatalysts synthesized via polyol process technique are applied as anode electro-catalyst in methanol electro-oxidation reaction (mor). to characterize the nanocatalysts, tem, xrd, eds and xps are investigated. cyclic voltammetry and choronoamperometry are used to evaluate the electro-catalytic activity and stability of the catalysts in methanol electro-oxi...

2015
P. Suganya

Enhancement is one of the challenging factors in image processing. The objective of enhancement is to improve the structural appearance of an image without any degradation in the input image. The enhancement techniques make the identification of key features easier by removing noise and other artifacts in an image. This paper analyzes the performance of various enhancement techniques based on n...

Journal: :Nanoscale 2014
Junjie Xu Jiwei Liu Renchao Che Chongyun Liang Maosheng Cao Yong Li Zhengwang Liu

The shape anisotropy of the nanostructured nanorattles is one of the key factors that affect their microwave absorption performance. In the present study, the microwave absorption performance of ellipsoidal Fe3O4@CuSiO3 nanorattles with different aspect ratios was investigated. Results demonstrated that the ellipsoidal nanorattles with the aspect ratio of 3-4 exhibited about 20% enhancement of ...

Journal: :Magnetic resonance imaging 2010
Noam Ben-Eliezer Yoav Shrot Lucio Frydman

An approach has been recently introduced for acquiring two-dimensional (2D) nuclear magnetic resonance images in a single scan, based on the spatial encoding of the spin interactions. This article explores the potential of integrating this spatial encoding together with conventional temporal encoding principles, to produce 2D single-shot images with moderate field of views. The resulting "hybri...

Ahad Ollah Ezzati, Hossein Mousavie Anijdan Seyed Rabi Mahdavi,

Introduction In this study, we aimed to calculate dose enhancement factor (DEF) for gold (Au) and iron (Fe) nanoparticles (NPs) in brachytherapy and teletherapy, using Monte Carlo (MC) method. Materials and Methods In this study, a new algorithm was introduced to calculate dose enhancement by AuNPs and FeNPs for Iridium-192 (Ir-192) brachytherapy and Cobalt-60 (Co-60) teletherapy sources, using...

Journal: :علوم باغبانی 0
سهراب داورپناه محمد علی عسگری سرچشمه مصباح بابالار مرجان سادات حسینی مجید امانی بنی

the current study was conducted in order to evaluate the effect of mono and di-potassium phosphate combination (mdkp) on some quantitative and qualitative characteristics of iranian pomegranate (cv. malas-e-saveh) in pomegranate research center of saveh city, in 2012. to adjust the ph of the solution, the mono potassium phosphate and di-potassium phosphate combined with each other in the ratio ...

2016
Ajay Gupta Hediyeh Baradaran Khalid Al‐Dasuqi Ashley Knight‐Greenfield Ashley E. Giambrone Diana Delgado Drew Wright Zhongzhao Teng James K. Min Babak B. Navi Costantino Iadecola Hooman Kamel

BACKGROUND Gadolinium enhancement on high-resolution magnetic resonance imaging (MRI) has been proposed as a marker of inflammation and instability in intracranial atherosclerotic plaque. We performed a systematic review and meta-analysis to summarize the association between intracranial atherosclerotic plaque enhancement and acute ischemic stroke. METHODS AND RESULTS We searched the medical ...

Journal: :Neurocomputing 2007
Pradeep Arkachar Meghanad D. Wagh

Although the role of lateral inhibition in edge (contrast) enhancement is well known, it has not been parametrized. This paper investigates the imbalance between the lateral inhibitory and excitatory stimuli and its effect on the edge enhancement and stability. It is shown that this imbalance can be expressed through g, a ratio of inhibitory to excitatory weights in a neuron. Stability requires...

Utilizing boundary integral method (BIM), we investigate molecularspontaneous emission rate enhancement in the vicinity of plasmonic nanoparticles ofelliptical cross section. These types of nanoparticles can considerably enhance themolecule decay rate. The spontaneous emission rate can be modified by altering theaspect ratio of the elliptical nanoparticle, the background refractive index andnan...

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