Chapter 7

MR Imaging of Flow on the Microscale

Dieter Suter

Dieter Suter

Technische Universität Dortmund, 44221 Dortmund, Germany

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Daniel Edelhoff

Daniel Edelhoff

Technische Universität Dortmund, 44221 Dortmund, Germany

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Jens Anders

Jens Anders

University of Stuttgart, Institute of Smart Sensors, Pfaffenwaldring 47, Stuttgart, 70569 Germany

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Jan G. Korvink

Jan G. Korvink

Karlsruhe Institute of Technology, Institute of Microstructure Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344 Germany

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First published: 18 May 2018
Book Series:Advanced Micro and Nanosystems

Summary

This chapter discusses two flow-imaging techniques that are useful for measuring flow on a microscopic scale: time of flight (ToF) and phase contrast (PC). It explores the physical limitations to the resolution and applicable parameter ranges of the flow. The chapter presents some specific examples, including the characterization of liquid exchange in different aneurysm models, the measurements of velocity fields, and the determination of wall shear stress (WSS) from the measured velocity field. ToF magnetic resonance imaging (MRI) is a possible method for observing flow on a microscopic scale. The PC method is well established for non-microscopic applications and is also suitable for flow imaging on microscopic scales. The ToF technique is used to measure the liquid exchange in different aneurysm models with a resolution of < 150 µm and validated these results with computer simulations.

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