نتایج جستجو برای: mri نمای dw

تعداد نتایج: 113134  

ژورنال: :مجله دانشکده پزشکی دانشگاه علوم پزشکی تهران 0
مسعود ثابتی sabeti m گروه اعصاب، بیمارستان سینا، دانشگاه علوم پزشکی تهران عبدالرضا ناصر مقدسی naser moghadasi a گروه اعصاب، بیمارستان سینا، دانشگاه علوم پزشکی تهران مهدی آلوش aloosh m مرکز تحقیقات بیمار یهای مغز و اعصاب ایران، دانشگاه علوم پزشکی تهران سید محمدحسن پاکنژاد paknejad sm گروه اعصاب، بیمارستان سینا، دانشگاه علوم پزشکی تهران منصوره تقاء toghae m گروه اعصاب، بیمارستان سینا، دانشگاه علوم پزشکی تهران

زمینه و هدف: وجود ضایعه حاد در تصویربرداری با تشدید مغناطیسی (mri) مغز با پخش وزنی یا تصویرگیری دیفیوژن (diffusion weighted imaging, dwi) در مبتلایان به حملات ایسکمیک گذرا (transient ischemic attack, tia) ارزش پیش گویی کننده برای وقوع سکته مغزی ایسکمیک بعدی در کوتاه مدت دارد. لذا شناخت ریسک فاکتورهایی که می توانند از لحاظ بالینی با وجود ضایعه در نمای dw مرتبط باشند، در رویکرد مناسب به بیماران م...

آلوش, مهدی, تقاء, منصوره, ثابتی, مسعود, ناصر مقدسی, عبدالرضا, پاکنژاد, سید محمدحسن,

Background: Finding an acute brain lesion by diffusion-weighted (DW) MRI upon an episode of transient ischemic attack (TIA) is a predictor of imminent stroke in the near future. Therefore, exploring risk factors associated with lesions in DW-MRI of the brain is important in adopting an approach to TIA management. In the current study, we tried to determine the risk factors associated with lesio...

Journal: :Journal of Magnetic Resonance Imaging 2013

Journal: :Topics in Magnetic Resonance Imaging 2016

Journal: :Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention 2013
Moti Freiman Onur Afacan Robert V. Mulkern Simon K. Warfield

Diffusion-weighted MRI images acquired with multiple b-values have the potential to improve diagnostic accuracy by increasing the conspicuity of lesions and inflammatory activity with background suppression. Unfortunately, the inherently low signal-to-noise ratio (SNR) of DW-MRI reduces enthusiasm for using these images for diagnostic purposes. Moreover, lengthy acquisition times limit our abil...

2015
Hai-Yi Wang Jia Wang Ye-Huan Tang Hui-Yi Ye Lin Ma

BACKGROUND Coronal diffusion-weighted magnetic resonance imaging (DW-MRI) and apparent diffusion coefficient (ADC) values have gradually become applied (following conventional axial DW-MRI) in the renal analysis. To explore whether data obtained using coronal DW-MRI are comparable with those derived using axial DW-MRI, this preliminary study sought to assess the agreement in renal ADC values be...

2010
G. Petralia H.C. Thoeny

Diffusion-weighted magnetic resonance imaging (DW-MRI) appears to hold promise as a non-invasive imaging modality in the detection of early microstructural and functional changes of different organs. DW-MRI is an imaging technique with a high sensitivity for the detection of a large variety of diseases in the urogenital tract. In kidneys, DW-MRI has shown promise for the characterization of sol...

2015
Adrian Andreou Aslam Sohaib David J Collins Taro Takahara Thomas C Kwee Martin O Leach David A MacVicar Dow-Mu Koh

BACKGROUND To evaluate diffusion-weighted MR neurography (DW-MRN) for visualizing the brachial plexus and for the assessment of brachial plexopathy. METHODS 40 oncological patients with symptoms of brachial plexopathy underwent 1.5 T MRI using conventional MR sequences and unidirectional DW-MRN. The images were independently reviewed by two radiologists. Anatomic visualization of the brachial...

حسن هاشمی, , داریوش مقینان, , زینت میابی, , کاوه صمیمی, ,

Background: Multiple sclerosis (MS) is a chronic disease that begins most commonly in young adults and is characterized pathologically by multiple areas of central nervous system (CNS) white matter inflammation, demyelination, and glial scarring. The most valuable aid for diagnosis is magnetic resonance imaging (MRI). New type of MRI has been developed on the basis of molecular diffusion which ...

2007
U. Nevo C. V. Stewart E. D. Gireesh D. Plenz P. J. Basser

Objectives Signal attenuation in Diffusion Weighted MRI (DW-MRI) of the brain originates from multiple sources [1] that are being studied extensively, in order to quantify their relative contributions to the DW-MRI signal in health and disease. Recently it was also suggested that some of these mechanisms can be used to detect neuronal activity directly by DW-MRI [2]. However, sources of physiol...

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