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Cardiovascular Magnetic Resonance pp 215–226Cite as

Flow measurements

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Abstract

Phase-contrast magnetic resonance imaging offers the opportunity of obtaining quantitative information on blood flow volume and velocity. The technical aspects are described in detail in Chapters 4 and 5. The information from the phase-contrast measurements is processed into two sets of images. The magnitude image resembles a bright blood image that is used for anatomical orientation. In the velocity image (phase-contrast), the gray value of each pixel represents the velocity information in that voxel. White values show flow away from the viewer, whereas black values show flow towards the viewer (Fig. 22.1). The values (white or black) are proportional to the flow velocity. Grey values represent stationary spins and can be used, e.g., in the skeletal muscle as an indication of noise. Phase information of air is arbitrary and is therefore not suitable for background subtraction or estimation of noise.

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Authors
  1. Christoph Klein
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Editors and Affiliations

  1. Cardiology - CMR, German Heart Institute Berlin, Augustenburger Platz 1, 13353, Berlin, Germany

    Eike Nagel

  2. Department of Cardiology, VU University Medical Center, De Boelelaan 1117, 1081 HV, Amsterdam, Niederlande

    Albert C. van Rossum

  3. Cardiology/Internal Medicine, German Heart Institute Berlin, Augustenburger Platz 1, 13353, Berlin, Germany

    Eckart Fleck

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© 2004 Springer-Verlag Berlin Heidelberg

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Klein, C. (2004). Flow measurements. In: Nagel, E., van Rossum, A.C., Fleck, E. (eds) Cardiovascular Magnetic Resonance. Steinkopff, Heidelberg. https://doi.org/10.1007/978-3-7985-1932-9_22

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  • DOI: https://doi.org/10.1007/978-3-7985-1932-9_22

  • Publisher Name: Steinkopff, Heidelberg

  • Print ISBN: 978-3-642-62152-9

  • Online ISBN: 978-3-7985-1932-9

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