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Abstract #0008

Quantifying the Impact of Velocity Field Distortions on Particle Tracking Techniques

Magnus Ziegler1,2, Martin Welander1,3, Marcus Lindenberger1,3, Niclas Bjarnegård1,3, Jonas Lantz1,2, Matts Karlsson1,2, Tino Ebbers1,2, Toste Länne1,3, and Petter Dyverfeldt1,2

1Linköping University, Linköping, Sweden, 2Center for Medical Image Science and Visualization (CMIV), Linköping, Sweden, 3University Hospital Linköping, Linköping, Sweden

Distortions in the velocity fields acquired by 4D Flow MRI affect particle tracking based visualization and quantification methods. Particle residence time was calculated in a subject with aortic aneurysm and was used to assess how particle tracking methods are impacted by noise and offset errors. To do so, a computationally derived ideal velocity field was created and distorted by adding noise and background phase-offsets. We found that particle tracking methods are severely impacted by offset errors, though more robust to random noise. Understanding the limits of these methods is crucial for their appropriate use.

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