Illustrative Flow Visualization from 3D Doppler Ultrasound Åsmund Birkeland 1, Linn Heljesen 1,2, Kim Nylund 2, Dag Magne Ulvang 3, Odd Helge Gilja 1,2.

Illustrative Flow Visualization from 3D Doppler Ultrasound

Åsmund Birkeland1, Linn Heljesen1,2, Kim Nylund2, Dag Magne Ulvang3, Odd Helge Gilja1,2 and Ivan Viola1,3

University of Bergen (1) Haukeland University Hospital (2) Christian Michelsen Research (3)

MotivationWhat we want:

3D Blood flow measurementLiveInexpensiveNon-invasive

What we have:4D MRI – expensive, not liveB-flow – only in 2DCEUS – invasive Doppler - ...

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MotivationPros:

InexpensiveLiveNon-invasiveSpatial in 3D

Cons:NoisySingle component of the blood flowDifficult to interpret for laymen

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Methodology

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Geometry ExtractionSegmentation

Vessels extend beyond the sector of a single 3D ultrasound coneImage based registration for fusing segments from several cones

Vessel geometryExtract center-line of segmented vesselsGenerate a vessel-direction map based on nearest center-line point

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3D Flow ReconstructionProbe position tracked using image based registrationReconstruction:Flux through a cross section:

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ResultsVerification based on 4D MRI data Accuracy 69% for angles above 55 degrees

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Results

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Future DirectionsIn-situ evaluationImprove visual representationMore advanced flow model

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Thank you for listeningQuestions?

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