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Magnetic Resonance Materials in Physics, Biology and Medicine
Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine 2/2015

01.04.2015 | Research Article

Volumetric velocity measurements in restricted geometries using spiral sampling: a phantom study

verfasst von: Anders Nilsson, Johan Revstedt, Einar Heiberg, Freddy Ståhlberg, Karin Markenroth Bloch

Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine | Ausgabe 2/2015

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Abstract

Object

The aim of this study was to evaluate the accuracy of maximum velocity measurements using volumetric phase-contrast imaging with spiral readouts in a stenotic flow phantom.

Materials and methods

In a phantom model, maximum velocity, flow, pressure gradient, and streamline visualizations were evaluated using volumetric phase-contrast magnetic resonance imaging (MRI) with velocity encoding in one (extending on current clinical practice) and three directions (for characterization of the flow field) using spiral readouts. Results of maximum velocity and pressure drop were compared to computational fluid dynamics (CFD) simulations, as well as corresponding low-echo-time (TE) Cartesian data. Flow was compared to 2D through-plane phase contrast (PC) upstream from the restriction.

Results

Results obtained with 3D through-plane PC as well as 4D PC at shortest TE using a spiral readout showed excellent agreements with the maximum velocity values obtained with CFD (<1 % for both methods), while larger deviations were seen using Cartesian readouts (−2.3 and 13 %, respectively). Peak pressure drop calculations from 3D through-plane PC and 4D PC spiral sequences were respectively 14 and 13 % overestimated compared to CFD.

Conclusion

Identification of the maximum velocity location, as well as the accurate velocity quantification can be obtained in stenotic regions using short-TE spiral volumetric PC imaging.
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Metadaten
Titel
Volumetric velocity measurements in restricted geometries using spiral sampling: a phantom study
verfasst von
Anders Nilsson
Johan Revstedt
Einar Heiberg
Freddy Ståhlberg
Karin Markenroth Bloch
Publikationsdatum
01.04.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Magnetic Resonance Materials in Physics, Biology and Medicine / Ausgabe 2/2015
Print ISSN: 0968-5243
Elektronische ISSN: 1352-8661
DOI
https://doi.org/10.1007/s10334-014-0449-0

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