نتایج جستجو برای: liver mri t2

تعداد نتایج: 449052  

2017

MRI has provided important insights into the pathophysiology of multiple sclerosis (MS).1 However, conventional MRI scans furnish only gross estimates of the nature and extent of tissue damage associated with MS,2 and the data correlate poorly with measures of concurrent disability in patients. Recent advances in MRI technology have improved the correlation of MRI findings with clinical status ...

2015
Hiroaki Kunogi Hidehiro Hojo Yoshiaki Wakumoto Anneyuko I. Saito Satoshi Ishikura Yuki Yamashiro Ryouhei Kuwatsuru Keisuke Sasai

PURPOSE To develop an accurate method of fusing computed tomography (CT) with magnetic resonance imaging (MRI) for post-implant dosimetry after prostate seed implant brachytherapy. MATERIAL AND METHODS Prostate cancer patients were scheduled to undergo CT and MRI after brachytherapy. We obtained the three MRI sequences on fat-suppressed T1-weighted imaging (FST1-WI), T2-weighted imaging (T2-W...

2009
L. Feng R. Otazo J. Jensen D. K. Sodickson D. Kim

Introduction: Measurement of proton transverse relaxation time (T2) can be used to detect pathological changes in tissue for a variety of clinical applications, including identification of edema and iron overload. The most widely used T2 mapping pulse sequence is the Carr-Purcell-Meiboom-Gill (CPMG) sequence [1,2]. For body MRI, however, a CPMG pulse sequence is typically performed with navigat...

Journal: :The European respiratory journal 1999
I Dimopoulou D T Kremastinos T G Maris S Mavrogeni G E Tzelepis

Iron deposition in the respiratory system has been proposed as a potential cause of the ventilatory restrictive impairment seen in patients with thalassaemia major (TM) and iron overload. In this study, magnetic resonance imaging (MRI) measurements of the liver (T2 relaxation time) were used as a surrogate index of total body iron burden and the extent to which these measurements correlated wit...

2008
A. H. Aletras P. Kellman L-Y. Hsu D. Groves R. F. Hoyt A. E. Arai

Introduction: The area at risk (AAR) of infarction is the hypoperfused myocardial bed during coronary occlusion. The edematous AAR can be delineated in-vivo by T2 MRI and can be used in conjunction with delayed contrast enhancement to calculate myocardial salvage. T1 MRI has been recently used to image the edema associated with acute myocardial infarction. Objectives: We hypothesized that, due ...

2008
Thomas C. Lauenstein

Magnetic resonance imaging (MRI) has become a major imaging tool for the depiction and characterization of abdominal disease. Standard abdominal MRI protocols encompass different forms of T1-weighted (T1w) and T2-weighted (T2w) data acquisition. These sequences can be collected in less than 20 seconds, which typically is within the patients’ ability to suspend respiration. Hence, artifacts due ...

2009
M. Santarelli N. Martini V. Positano A. Pepe D. De Marchi L. Landini M. Lombardi

Introduction It is well known that the susceptibility difference between tissues, such as venous blood and surrounding tissue, causes a different bulk magnetization that can be observed both in magnitude and phase images: as a signal amplitude loss due to a reduced T2*, and as a local frequency variation of the protons inside the vessel that results in a phase angle Φ of the venous blood signal...

Journal: :Toxicological sciences : an official journal of the Society of Toxicology 2012
Andreas Schmid Benjamin Rignall Bernd J Pichler Michael Schwarz

Noninvasive methods for the early detection of tumor onset and progression in rodent liver would be of high value for pharmaceutical and chemical industry and would, at the same time, foster one of the 3 Rs (replacement, reduction, refinement) by reducing the number of animals in the bioassay. We have induced liver tumors in mice by single injection of diethylnitrosamine (DEN) either in 2-week-...

2013
Andrew J Coristine Ruud B van Heeswijk Matthias Stuber

Background In MRI, fat signal suppression is mandatory for unambiguous visualization of cardiac anatomy but remains challenging at high field. Fat saturation usually directly precedes the imaging portion of a cardiac MRI sequence. It is often used in conjunction with other magnetization preparation modules, such as T2 Preparation (or T2-Prep), to improve blood/myocardium contrast. We propose a ...

2017
Carola F. van Eck R. Scott Kingston John V. Crues F. Daniel Kharrazi

Background Patellofemoral pain is common, and treatment is guided by the presence and grade of chondromalacia. Purpose To evaluate and compare the sensitivity and specificity in detecting and grading chondral abnormalities of the patella between proton density fat suppression (PDFS) and T2 mapping magnetic resonance imaging (MRI). Study Design Cohort study; Level of evidence, 2. Methods A...

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