1. 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 and Ivan Viola 1,3 University of Bergen (1) Haukeland University Hospital (2) Christian Michelsen Research (3)

2. Motivation Blood flow imaging What we want: 3D Blood flow measurements Live Inexpensive Non-invasive What we have: 4D MRI – expensive, not live B-flow – only in 2D CEUS – invasive Doppler –... 2/10

3. Motivation Pros: Inexpensive Live Non-invasive Cons: Noisy Single component of the blood flow Difficult to interpret for laymen 3/10

4. Methodology 4/10

5. Geometry Extraction Segmentation Extract vessel segments during an ultrasound scan Image based registration for fusing segments together Vessel geometry Extract center-line of segmented vessels Generate a vessel-direction map based on nearest center-line point 5/10

6. 3D Flow Reconstruction 6/10

7. Visual Mapping 7/10 Animated particles depicting flow direction and velocity magnitude Velocity legends for identifying velocity magnitude Color according to flux through cross section

8. Results Verification based on 4D MRI data Accuracy: 69% for angles below 55 degrees 8/10

9. Future Directions In vivo evaluation Improve visual representation More advanced flow model 9/10

10. Thank you for listening! Questions? 10/10