An improved preparation pulse for quantitative t2 mapping of blood in the cardiac chambers
نویسندگان
چکیده
Background T2 is sensitive to hemoglobin oxygen saturation (%HbO2). Non-invasive, rapid in-vivo quantification of %HbO2 based on the T2 of blood may be useful in patients with congenital heart disease. Although singleshot, T2-prepared SSFP enables rapid myocardial T2 quantification [1], flow sensitivity of the T2 preparation, especially at later echo times, may cause an underestimation of T2 values in flowing blood. We aim to reduce flow sensitivity of the T2 preparation pulse for rapid and accurate quantification of T2 in blood.
منابع مشابه
Normal Echocardiographic Findings in Healthy Pigeons
Objective- The purpose of this study was to investigate the feasibility of performing echocardiography in apparently healthy pigeons, and measurement of the quantitative cardiac indices using B-mode and Doppler techniques. Design- Experimental study Animals- Ten apparently healthy pigeons Procedures- Echocardi...
متن کاملA System for Continuous Estimating and Monitoring Cardiac Output via Arterial Waveform Analysis
Background: Cardiac output (CO) is the total volume of blood pumped by the heart per minute and is a function of heart rate and stroke volume. CO is one of the most important parameters for monitoring cardiac function, estimating global oxygen delivery and understanding the causes of high blood pressure. Hence, measuring CO has always been a matter of interest to researchers and clinicians. Sev...
متن کاملQuantitative Detection of Myocardial Edema using a Breath-hold T2 Mapping Pulse Sequence
Introduction: An inflammatory response to various diseases, including acute myocardial ischemia, cardiac transplantation rejection and acute myocarditis, results in water accumulation in the myocardium. Excess water accumulation results in myocardial edema, which can lead to various conditions including myocardial stiffness, diastolic dysfunction, and tissue swelling [1]. Current methods for di...
متن کاملInterleaved T2 preparation for simultaneous coronary artery and pulmonary artery and vein visualization
Background Evaluation of a dynamic T2-preparation (dynT2prep) sequence, whereby the first dynamic is acquired with and the second without T2 preparation. T2 preparation allows suppression of tissues with short T2 relaxation times, e.g. deoxygenated blood. Tissues with long T2 relaxation times, e.g. oxygenated arterial blood, are minimally influenced. Thus both blood of the pulmonary veins and l...
متن کاملB1-insensitive T2 preparation for improved coronary magnetic resonance angiography at 3 T.
At 3 T, the effective wavelength of the RF field is comparable to the dimension of the human body, resulting in B1 standing wave effects and extra variations in phase. This effect is accompanied by an increase in B0 field inhomogeneity compared to 1.5 T. This combination results in nonuniform magnetization preparation by the composite MLEV weighted T2 preparation (T2 Prep) sequence used for cor...
متن کامل