Flow-gated phase-contrast MRI using radial acquisitions
نویسندگان
چکیده
منابع مشابه
On the Advantages of Retrospectively Gated Radial Acquisitions for Cine Phase Contrast Flow Imaging
Introduction: High quality dynamic cardiovascular MRI requires synchronization of the data acquisition and cardiac pulsatility. In most clinical applications, this is accomplished with prospective cardiac gating with an ECG or pulse oximeter (PO) signal. This approach results in incomplete coverage of the cardiac cycle (CC) because a rejection window (usually 10% of CC) at the end of the cardia...
متن کاملAdvances in real-time phase-contrast flow MRI using asymmetric radial gradient echoes.
PURPOSE To provide multidimensional velocity compensation for real-time phase-contrast flow MRI. METHODS The proposed method introduces asymmetric gradient echoes for highly undersampled radial FLASH MRI with phase-sensitive image reconstruction by regularized nonlinear inversion (NLINV). Using an adapted gradient delay correction the resulting image quality was analyzed by simulations and ex...
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Velocity imaging with phase contrast (PC) MRI is a noninvasive tool for quantitative blood flow measurement in vivo. A shortcoming of conventional PC imaging is the reduction in temporal resolution as compared to the corresponding magnitude imaging. For the measurement of velocity in a single direction, the temporal resolution is halved because one must acquire two differentially flow-encoded i...
متن کاملPhase-contrast MRI volume flow - a comparison of breath held and navigator based acquisitions
BACKGROUND Magnetic Resonance Imaging (MRI) 2D phase-contrast flow measurement has been regarded as the gold standard in blood flow measurements and can be performed with free breathing or breath held techniques. We hypothesized that the accuracy of flow measurements obtained with segmented phase-contrast during breath holding, and in particular higher number of k-space segments, would be non-i...
متن کاملReal-time phase-contrast MRI of cardiovascular blood flow using undersampled radial fast low-angle shot and nonlinear inverse reconstruction.
Velocity-encoded phase-contrast MRI of cardiovascular blood flow commonly relies on electrocardiogram-synchronized cine acquisitions of multiple heartbeats to quantitatively determine the flow of an averaged cardiac cycle. Here, we present a new method for real-time phase-contrast MRI that combines flow-encoding gradients with highly undersampled radial fast low-angle shot acquisitions and phas...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2004
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.20187