نتایج جستجو برای: magnetic resonance imaging dwi

تعداد نتایج: 737966  

Journal: :Biomedical Engineering Online 2021

Abstract Background As an object’s electrical passive property, the conductivity is proportional to mobility and concentration of charged carriers that reflect brain micro-structures. The measured multi- b diffusion-weighted imaging (M -DWI) data by controlling degree applied diffusion weights can quantify apparent water molecules within biological tissues. Without any external stimulation, mag...

Journal: :Frontiers in Physics 2022

Background: Assessment of renal lesions and deficiency accurately remains critical in the diagnosis congenital anomalies kidneys urinary tracts (CAKUT) children. Advanced imaging such as Magnetic resonance Imaging (MRI) Diffusion weighted (DWI) allows structural functional insufficiency to be detected. Currently, radiomics machine learning models are being explored full-automated diagnostic too...

Journal: :The journal of international advanced otology 2015
Ali Cihan Yiğiter Ercan Pınar Abdülkadir İmre Nezahat Erdoğan

OBJECTIVE The aim of this study was to evaluate the diagnostic accuracy of echo-planar diffusion-weighted magnetic resonance imaging (EP-DWI) and high-resolution computed tomography (HRCT) in the detection and localization of cholesteatoma. MATERIALS AND METHODS Fifty-four patients were prospectively included in this study. Patients with suspected primary or residual cholesteatoma were evalua...

2017
Xiujuan Wu Song Luo Ying Wang Yang Chen Jun Liu Jing Bai Jiachun Feng Hongliang Zhang

RATIONALE The ischemic penumbra assessment is essential for the subsequent therapy and prediction of evolution in patients with acute ischemic infraction. Although controversial as a perfect equivalence to penumbra, perfusion-weighted imaging (PWI)-diffusion-weighted imaging (DWI) mismatch may predict the response to thrombolysis. Due to the reliance of PWI on contrast agents, noninvasive alter...

Arash Shabani , Ayoob Rostamzadeh , Fariborz Faeghi , Jalal Jalal-Shokouhi,

Background: Early diagnosis of brain tumors has significant effect on the treatment process. Brain metastatic tumors are usually diagnosed following the neurological symptoms in patients or incidentally after Computerized Tomography (CT) scan and Magnetic Resonance Imaging (MRI) requests of the brain. Objectives: Implementation of a new method for being informed about the origin of brain tumors...

Journal: :Stroke 2007
Raquel Delgado-Mederos Alex Rovira José Alvarez-Sabín Marc Ribó Josep Munuera Marta Rubiera Esteban Santamarina Olga Maisterra Pilar Delgado Joan Montaner Carlos A Molina

BACKGROUND AND PURPOSE We sought to evaluate the impact of the speed of recanalization on the evolution of diffusion- weighted imaging (DWI) lesions and outcome in stroke patients treated with tissue-type plasminogen activator (tPA). METHODS We evaluated 113 consecutive stroke patients with a middle cerebral artery occlusion who were treated with intravenous tPA. All patients underwent multip...

Journal: :International Journal of Biomedical Imaging 2006
Ying Han Enzhong Li Jie Tian Jian Chen Huifang Wang Jianping Dai

Diffusion- and perfusion-weighted magnetic resonance imaging (DWI and PWI) was applied for stroke diagnose in 120 acute (< 48 h) ischemic stroke patients. At hyperacute (< 6 h) stage, it is difficult to find out the infarction zone in conventional T1 or T2 image, but it is easy in DWI, apparent diffusion coefficient (ADC) map; when at 3-6-hour stage it is also easy in PWI, cerebral blood flow (...

Journal: :Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine 2007
Seiko Kuroki-Suzuki Yoshifumi Kuroki Katsuhiro Nasu Shigeru Nawano Noriyuki Moriyama Masatoshi Okazaki

We combined diffusion-weighted (DWI) and short TI inversion recovery (STIR) imaging to evaluate the diagnostic capability of non-contrast magnetic resonance (MR) imaging to detect breast cancer. Seventy women patients underwent mammography and MR imaging with combined DWI (b factor: 1000) and STIR that revealed malignancy, and postoperative pathological examination confirmed breast cancer. Inte...

Journal: :International Journal of Research in Medical Sciences 2022

Marchiafava-Bignami Disease (MBD) is a rare neurodegenerative disease usually associated with chronic alcoholism characterized by demyelination and necrosis of the corpus callosum. Here, we report 57-year-old patient who presented to our hospital acute aphasia, disorientation altered mental state. Diffusion weighted imaging (DWI) magnetic resonance (MRI) revealed areas restricted diffusion in c...

2013
Firas Mosavi Gustav Ullenhag Håkan Ahlström

BACKGROUND Whole-body (WB) magnetic resonance imaging (MRI), including diffusion-weighted imaging (DWI), has been increasingly used for the detection of metastatic disease. PURPOSE To assess the value of WB MRI including DWI compared to computed tomography (CT) for staging of malignant melanoma. A second aim was to assess the value of DWI in addition to conventional MR sequences for the detec...

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