Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"myocardial perfusion"”.
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Myocardial Perfusion Imaging With Rb-82 PET
Myocardial perfusion imaging (MPI) is an effective technique used to study the left ventricular ejection function (LVEF), myocardial perfusion, wall motion, and wall thickening. Positron emission tomography (PET) and single photon emission computed tomography (SPECT) are two modalities that can be …
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An investigation into the limitations of myocardial perfusion imaging
Myocardial Perfusion Imaging (MPI) plays a very important role in the management of patients with suspected Coronary Artery Disease and its use has grown despite the shortcomings of the technique. Significant progress has been made in identifying the causes of these shortcomings and many solutions …
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Quantification of Myocardial Perfusion Based on Signal Intensity of Flow Sensitized MRI
The quantitative assessment of perfusion is important for early recognition of a variety of heart diseases, determination of disease severity and their cure. In conventional approach of measuring cardiac perfusion by arterial spin labeling, the relative difference in the apparent T1 relaxation …
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Validation of first pass magnetic resonance myocardial perfusion imaging using fractional flow reserve
Background - Magnetic Resonance Myocardial Perfusion Imaging (MRMPI) has been used for the detection of reversible myocardial ischaemia in humans since the early 1990’s. This non-invasive method of diagnosing reversible myocardial ischaemia has a number of advantages over the other more commonly …
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Regional myocardial perfusion : experimental and clinical studies in patients with coronary artery disease
… coronary atherosclerosis, angina pectoris, acute myocardial infarction and sudden death. The narrowing of coronary arteries is thought to damage the heart by limiting appropriate changes in coronary blood flow and by causing myocardial ischemia. This thesis attempts to examine the coronary …
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Comparison Between TIMI Myocardial Perfusion Grade and Microvascular Indexes, Myocardial Viability, Improvement of LV Function After Primary PCI in STEMI
… 시행받은 급성 심근경색 환자에서 심혈관 조영술 상 경색관련 관상동맥의 TIMI Myocardial Perfusion Grade와 심근 생존능 및 6개월 추적관찰 시 좌심실 기능개선과의 연관성 배경 및 목적: 급성 심근경색 환자에서 미세혈관의 손상정도 및 심근의 생존능은 환자의 예후에 매우 중요한 인자라고 알려져 있다. 본 연구에서는 급성 심근경색 환자에서 성공적인 일차적 관상동맥 중재시술 후 심도자실에서 간단히 평가할 수 있는 관상동맥 조영술 상의 TMPG가 미세혈관 손상을 나타내는 관상동맥의 혈역학적 지수들, …
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Studies of GD-DTPA relaxivity and proton exchange rates in tissue with implications for MR imaging of regional myocardial perfusion
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1993.
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Evaluation of the effect of breast implants on the accuracy of the CT attenuation Correction (CTAC) map for SPECT/CT myocardial perfusion imaging: a phantom study
Background: Myocardial perfusion imaging (MPI) using single photon emission computedtomography (SPECT) imaging can assess myocardial viability and perfusion. However,overlying thoracic structures, such as ribs or breast tissue lead to gamma ray attenuation. Thisattenuation does not occur equally …
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IMPACT OF STRESS CARDIAC COMPUTED TOMOGRAPHY MYOCARDIAL PERFUSION ON DOWNSTREAM RESOURCES AND PROGNOSIS IN PATIENTS WITH SUSPECTED OR KNOWN CORONARY ARTERY DISEASE: A MULTICENTRE INTERNATIONAL STUDY - THE CTP-PRO STUDY
Background: Stress computed tomography perfusion (Stress-CTP) is a CT-based functional technique that can be added to coronary computed tomography angiography (cCTA) to improve management of patients with suspected coronary artery disease (CAD). The aim of the study is to evaluate the usefulness of …
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In-Silico design and verification of an extracorporeal normothermic cardiac perfusion system for use during heart transplantation procedures
… with cardioplegic arrest to continuous blood perfusion, which enhances metabolic support and extends viable ischemic time. This study explores the development of a system for continuous myocardial perfusion to improve donor heart preservation during transplantation. Using in-silico modelling …
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In-Silico design and verification of an extracorporeal normothermic cardiac perfusion system for use during heart transplantation procedures
… with cardioplegic arrest to continuous blood perfusion, which enhances metabolic support and extends viable ischemic time. This study explores the development of a system for continuous myocardial perfusion to improve donor heart preservation during transplantation. Using in-silico modelling …
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Cardiovascular Magnetic Resonance Guided Revascularisation
… of a high-resolution <em>k-t</em> accelerated perfusion sequence with a standard sequence.<br/> ii. Validation of CMR quantification of absolute myocardial perfusion using the high-resolution sequence against PET.<br/> iii. Investigation of the relationship between an angiographic score (BCIS-1 …
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Adaptive Mechanisms of the Heart to Ischaemic Stress
… mechanisms using the models of exercise induced myocardial ischaemia and acute myocardial infarction<br/>Methods<br/>Using a specially adapted supine ergometer, we used invasive physiological measurements and high-resolution cardiac magnetic resonance imaging to assess changes in coronary blood …
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Improving Cardiovascular Risk Assessment with CT Coronary Angiography and Myocardial CT Perfusion
… of coronary atherosclerosis, calcification and myocardial perfusion are necessary to determine future cardiovascular risk in various clinical settings. CT coronary angiography (CTCA) and myocardial CT perfusion (CTP) are promising techniques for the assessment of these factors. This thesis is …
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Quantitative and Qualitative Assessment of the Myocardium at Risk
… in patients with conventional methods, such as myocardial perfusion single-photon emission computed tomography (SPECT) or electrocardiography. However, to assess cardioprotective strategies aimed at reducing infarct size, an accurate measure of both myocardium at risk and infarct size is needed. …
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A subspace approach to accelerated cardiovascular magnetic resonance imaging
… are demonstrated: cine imaging, first-pass myocardial perfusion imaging, late gadolinium enhancement imaging, extracellular volume fraction mapping, and labeled immune cell imaging. Experimental results include human cine images up to 22 fps and 1.0 mm × 1.0 mm spatial resolution, mouse cine …
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Hydrodynamic considerations of coronary blood flow with and without stenosis
… flow, and thus to determine its influence on myocardial perfusion. In summary, this thesis is concerned with the effects of the stenosis on left coronary blood flow. To determine these effects it has been necessary in a first step to understand left coronary blood flow and its regulation. This …
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Advanced Applications of Cardiac Computed Tomography for the Difficult-to-Image Patient
… information is considered, with studies of myocardial perfusion CT and delayed iodine enhancement imaging, to identify ways in which non-coronary imaging might be exploited to more thoroughly evaluate a patient’s coronary artery status. These findings are presented in the context of …
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Image processing techniques in nuclear medicine
… has been investigated. <br></br><br></br>Hepatic perfusion imaging studies with <sup>99</sup>Tc<sup>m</sup>-tin colloid were performed in patients with primary colorectal carcimma. The hepatic perfusion index performed poorly in the detection of those patients with occult or overt hepatic …
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Dysfunctional but viable myocardium - ischemic heart disease assessed by magnetic resonance imaging and single photon emission computed tomography
… characteristics with regards to function, perfusion and viability. Therefore, in Paper I we developed a method for quantitative polar representation of left ventricular myocardial function, perfusion and viability using single photon emission computed tomography (SPECT) and cardiac magnetic …
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