Flow measurements

  • Christoph Klein


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.


Right Coronary Artery Encode Image Diastolic Heart Failure Pulmonary Trunk Blood Flow Volume 


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© Springer-Verlag Berlin Heidelberg 2004

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  • Christoph Klein

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