نتایج جستجو برای: t2 relaxometry

تعداد نتایج: 31231  

2010
S. Haber-Pohlmeier D. van Dusschoten

Longitudinal and transverse relaxation times are used to characterise the pore system of a natural Kaldenkirchen sandy loam. Here we present new results obtained by relaxometric imaging (MEMS) and two-dimensional T1-T2 correlation relaxometry, and compare these with available T1relaxation time distributions of water obtained by the analysis of fast field cycling relaxometry (FFC) data. The soil...

Journal: :Quantitative imaging in medicine and surgery 2015
Pascal Martin Benjamin Bender Niels K Focke

Currently, a relevant proportion of all histopathologically proven focal cortical dysplasia (FCD) escape visual detection; this shows the need for additional improvements in analyzing MRI data. A positive MRI is still the strongest prognostic factor for postoperative freedom of seizures. Among several post-processing methods voxel-based morphometry (VBM) of T1- and T2-weighted sequences and T2 ...

ژورنال: :مجله دانشگاه علوم پزشکی همدان 0
مرتضی بختیاری morteza bakhtiari نادر ریاحی عالم nader riahi alam محمدعلی عقابیان mohammad ali oghabian علی قاسم زاده ali ghasemzadeh حسین قناعتی hosein ghenaati سعید سرکار saeed sarkar باقر لاریجانی

مقدمه و هدف: در تکنیک dexa(dual energy x-ray absorptiometry) بعنوان بهترین روش اندازه گیری تراکم استخوان فقط میزان مواد معدنی استخوان اندازه گیری شده و تصویری مستقیم از عضو مورد نظر حاصل نمیگردد ، این امر بعضاً باعث خطا در اندازه گیری شده, به طوری که در شکستگی مهره های کمری که به همراه کاهش ارتفاع مهره می باشد، افزایش bmd(bone mineral density) در تکنیک dexa دیده میشود. تعیین پروتکل بهینه در روش ...

Journal: :Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine 2006
Akihiro Tanimoto Makio Mukai Sachio Kuribayashi

PURPOSE To investigate the proton relaxation mechanisms and the optimal MR imaging parameters in superparamagnetic iron oxide (SPIO)-enhanced MR imaging of liver injury. METHODS A liver injury model was created in the rat using carbon tetrachloride. The T1 and T2 relaxation effects of SPIO in normal and injured liver were estimated by ex vivo relaxometry. In vivo laser confocal microscopy of ...

2007
J. F. Jansen E. P. Lemmens G. Hoogland O. E. Schijns W. Jennekens G. J. Strijkers J. J. Prompers J. W. Habets M. E. Kooi W. H. Backes K. Nicolay

regions of interests. (B,C,D) Bar diagrams displaying the mean±SD T2, trace and FA values, respectively, for the HT(blue), HT+ (red), and NT (green) rat pups, at PN10 (solid) and PN66 (dashed). * and ** denote p<0.05 and p<0.01, respectively. (E,F) ADC images at PN66 of a typical NT rat (E) and a HT+ rat (F). Notice the pronounced ventral signal decrease in the HT+ rat. Prospective brain T2 rel...

2013
Kathryn E. Washburn Justin E. Birdwell Joseph D. Seymour Catherine Kirkland Sarah J. Vogt

Low-field nuclear magnetic resonance (LF-NMR) relaxometry is a non-invasive technique commonly used to assess hydrogen-bearing fluids in petroleum reservoir rocks. Longitudinal T1 and transverse T2 relaxation time measurements made using LF-NMR on conventional reservoir systems provides information on rock porosity, pore size distributions, and fluid types and saturations in some cases. Recent ...

2014
Ben Andrew Duffy ManKin Choy

................................................................................................................... 3 Acknowledgements .................................................................................................. 4 List of Figures ........................................................................................................ 10 List of Tables .........................

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