نتایج جستجو برای: magnetic resonance imaging denoising

تعداد نتایج: 745036  

Journal: :basic and clinical neuroscience 0
somayeh maleki-balajoo department of biomedical engineering, faculty of electrical engineering, khaje nasir toosi university of technology, tehran, iran. gholam-ali hossein-zadeh control and intelligent processing center of excellence, school of electrical and computer engineering, university of tehran, tehran, iran. hamid soltanian-zadeh control and intelligent processing center of excellence, school of electrical and computer engineering, university of tehran, tehran, iran. hamed ekhtiari research center for cellular and molecular imaging, tehran university of medical sciences, tehran, iran.

introduction: a fixed hemodynamic response function (hrf) is commonly used for functional magnetic resonance imaging (fmri) analysis. however, hrf may vary from region to region and subject to subject. we investigated the effect of locally estimated hrf (in functionally homogenous parcels) on activation detection sensitivity in a heroin cue reactivity study. methods: we proposed a novel explora...

2014
Mawia Ahmed Hassan

Magnetic Resonance Imaging (MRI) uses Radio waves and strong magnetic field rather than X-ray to provide clear and detailed pictures of internal organs and tissues. Functional Magnetic Resonance Imaging (fMRI) is a non-invasive brain imaging technique, which developed in the early 1990's, for determining which parts of the brain are activated by different types of physical sensation or activity...

Esmaeil Fakharian, Hamid Reza Talari, Hossein Akbari, Maryam Montazeri, Mohammad Ali Atlasi,

Background and Aim: Topography of the human insula has occasionally been studied in different populations. The purpose of this study was to evaluate the morphology of human insula in Iranian population and its relationship with sex, age, and handedness via magnetic resonance imaging. Methods and Materials/Patients: In our study, 380 normal magnetic resonance imaging were enrolled. The number...

Journal: :dental research journal 0
ravi prakash sasankoti mohan navneet gill sankalp verma venkateshwar rao chawa kuber tyagi neha agarwal

the incidence of multiple myeloma (mm) affecting the jaws is 30% and on rare occasions the oral involvement can be the first indication of the disease. authors report a case of mm in a 40-yearold woman who presented with a multilocular radiolucent lesion in the left mandible initially mistaken as an ameloblastoma. conventional radiographs revealed a multilocular lesion on the molar region. comp...

2014
Michaël Bernier Maxime Chamberland Jean-Christophe Houde Maxime Descoteaux Kevin Whittingstall

In recent years, there has been ever-increasing interest in combining functional magnetic resonance imaging (fMRI) and diffusion magnetic resonance imaging (dMRI) for better understanding the link between cortical activity and connectivity, respectively. However, it is challenging to detect and validate fMRI activity in key sub-cortical areas such as the thalamus, given that they are prone to s...

Magnetic Resonance Imaging (MRI) is a noninvasive imaging method widely used in medical diagnosis. Data in MRI are obtained line-by-line within the K-space, where there are usually a great number of such lines. For this reason, magnetic resonance imaging is slow. MRI can be accelerated through several methods such as parallel imaging and compressed sensing, where a fraction of the K-space lines...

Journal: :iranian journal of parasitology 0
ali baradan bagheri dept. of surgery, shahid madani hospital, alborz university of medical sciences, karaj, iran mohammad zibaei dept. of parasitology and mycology, school of medicine, alborz university of medical sciences, karaj, iran mehdi tayebi arasteh dept. of anesthesiology, shahid bahonar hospital, alborz university of medical sciences, karaj, iran

although hydatid disease eradicated in many countries, it is still widespread in communities where agriculture is dominant. cystic hydatidosis is significant public health problem in the regions with endemic echinococcosis. the hydatid cysts tend to form mostly in the liver or lung. brain involvement is very rare. in the present report, we describe magnetic resonance imaging findings in an 18-y...

A Hashemi, B Rahimi, M Noroozi, N Valizadeh, S Hejazi, Sh Nateghi, V Alinejad,

Abstract Background Iron overload is the main transfusion related side effects in patients with transfusion dependent hemoglobinopathies. Severe iron deposition in tissues leads to organ dysfunction. Many organs can be affected such as heart, liver, and endocrine organs. Cardiac failure and liver fibrosis are the consequent of Iron overload in transfusion dependent hemoglobinopathy. Magne...

2016
Dhritiman Das Eduardo Coello Rolf F. Schulte Bjoern H. Menze

Magnetic resonance spectroscopic imaging (MRSI) is an imaging modality used for generating metabolic maps of the tissue in-vivo. These maps show the concentration of metabolites in the sample being investigated and their accurate quantification is important to diagnose diseases. However, the major roadblocks in accurate metabolite quantification are: low spatial resolution, long scanning times,...

Journal: :Algorithmic Operations Research 2011
Joe Qranfal Dorit S. Hochbaum Germain Tanoh

We show here that the implementation of the Markov random fields image segmentation algorithm of Hochbaum 2001 works well for the purpose of denoising and segmenting medical images. One of the main contributions here is the ability for a user to manipulate online the image so as to achieve clear delineation of objects of interest in the image. This is made possible by the efficiency of the impl...

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