نتایج جستجو برای: سیستم مهاربندی پیشنهادی mbf

تعداد نتایج: 91354  

Journal: :Clinical journal of the American Society of Nephrology : CJASN 2008
Christopher W McIntyre James O Burton Nicholas M Selby Lucia Leccisotti Shvan Korsheed Christopher S R Baker Paolo G Camici

BACKGROUND AND OBJECTIVES Hemodialysis is associated with hemodynamic instability, acute cardiac ischemia, and the development of regional wall motion abnormalities (RWMAs). This study used serial intradialytic H(2)(15)O positron emission tomography scanning to confirm that the development of dialysis-induced RWMAs was associated with reduction in myocardial blood flow (MBF). DESIGN, SETTING,...

2014
Thomas Troalen Thibaut Capron Monique Bernard Frank Kober

BACKGROUND Assessment of cyclic myocardial blood flow (MBF) variations can be an interesting addition to the characterization of microvascular function and its alterations. To date, totally non-invasive in vivo methods with this capability are still lacking. As an original technique, a cine arterial spin labeling (ASL) cardiovascular magnetic resonance approach is demonstrated to be able to pro...

Journal: :BMC Medical Physics 2009
Karin Knešaurek Josef Machac Zhuangyu Zhang

BACKGROUND We evaluated the repeatability of the calculation of myocardial blood flow (MBF) at rest and pharmacological stress, and calculated the coronary flow reserve (CFR) utilizing 82Rb PET imaging. The aim of the research was to prove high repeatability for global MBF and CFR values and good repeatability for regional MBF and CFR values. The results will have significant impact on cardiac ...

Journal: :JACC. Cardiovascular imaging 2012
Li-Yueh Hsu Daniel W Groves Anthony H Aletras Peter Kellman Andrew E Arai

OBJECTIVES The aim of this study was to evaluate fully quantitative myocardial blood flow (MBF) at a pixel level based on contrast-enhanced first-pass cardiac magnetic resonance (CMR) imaging in dogs and in patients. BACKGROUND Microspheres can quantify MBF in subgram regions of interest, but CMR perfusion imaging may be able to quantify MBF and differentiate blood flow at a much higher resol...

2014
Hendrik J. Harms Mark Lubberink Stefan de Haan Paul Knaapen Marc C. Huisman Robert C. Schuit Albert D. Windhorst Cornelis P. Allaart Adriaan A. Lammertsma

Mismatch between areas of reduced myocardial blood flow (MBF) and reduced myocardial innervation (’defect’ areas) may be used to predict ventricular arrhythmias. The presence of a mismatch zone can be derived from a combined protocol consisting of both an MBF and [C]-meta-hydroxyephedrine ([C]HED) scans. The rate of influx of [C]HED from blood to myocardium (K1) is proportional to MBF and could...

2014
Christopher A Miller Josephine H Naish Mark P Ainslie Christine Tonge Deborah Tout Parthiban Arumugam Anita Banerji Robin Egdell David Clark Peter J Weale Christopher D Steadman Gerry P McCann Simon G Ray Geoffrey J Parker Matthias Schmitt

BACKGROUND Quantitative assessment of myocardial blood flow (MBF) from cardiovascular magnetic resonance (CMR) perfusion images appears to offer advantages over qualitative assessment. Currently however, clinical translation is lacking, at least in part due to considerable disparity in quantification methodology. The aim of this study was to evaluate the effect of common methodological differen...

Journal: :European heart journal 2007
Felix T Range Michael Schäfers Tayfun Acil Klaus P Schäfers Peter Kies Matthias Paul Sven Hermann Betty Brisse Günter Breithardt Otmar Schober Thomas Wichter

AIMS Patients with atrial fibrillation (AF) present with symptoms of myocardial ischaemia despite exclusion of coronary artery disease. A small vessel disease has been suggested. We quantified myocardial perfusion, perfusion reserve, and coronary vascular resistance (CVR) in AF patients using positron emission tomography (PET). METHODS AND RESULTS Twenty-five male patients (age: 58 +/- 13 yea...

Journal: :PLoS ONE 2009
Mehdi Namdar Tiziano Schepis Pascal Koepfli Oliver Gaemperli Patrick T. Siegrist Renate Grathwohl Ines Valenta Raphael Delaloye Michael Klainguti Christophe A. Wyss Thomas F. Lüscher Philipp A. Kaufmann

BACKGROUND Caffeine is one of the most widely consumed pharmacologically active substances. Its acute effect on myocardial blood flow is widely unknown. Our aim was to assess the acute effect of caffeine in a dose corresponding to two cups of coffee on myocardial blood flow (MBF) in coronary artery disease (CAD). METHODOLOGY/PRINCIPAL FINDINGS MBF was measured with (15)O-labelled H2O and Posi...

2015
Jacob U. Fluckiger Brandon C. Benefield Lara Bakhos Kathleen R. Harris Daniel C. Lee

OBJECTIVES To evaluate the impact of correcting myocardial signal saturation on the accuracy of absolute myocardial blood flow (MBF) measurements. MATERIALS AND METHODS We performed 15 dual bolus first-pass perfusion studies in 7 dogs during global coronary vasodilation and variable degrees of coronary artery stenosis. We compared microsphere MBF to MBF calculated from uncorrected and correct...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه محقق اردبیلی - دانشکده فنی 1388

در دهه های اخیر محققان بسیاری در سراسر جهان به بررسی تاثیر اتصالات نیمه صلب بر رفتار سیستم های سازه ای فولادی پرداخته اند. در تحقیقات پیشین تاثیر اتصال نیمه صلب در سیستم قاب خمشی ویژه و سیستم مهاربندی با اتصال نیمه صلب مهاربندها مورد بررسی قرار گرفته است و نتایج نشان داده است که کاربرد این اتصال به جز در کنترل جابجایی جانبی طبقات در سایر موارد مانند سبک تر شدن سازه، کاهش برش پایه بسیار مفید می ...

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