Abstract #1824

Phase unwrapping 4D flow MRI by iterative graph cuts

Mio Liljeblad¹, Sohaib Ayaz Qazi², Tamara Bianchessi², Petter Dyverfeldt², and Johan Berglund³

¹Medical Physics, Uppsala University Hospital, Uppsala, Sweden, ²Center for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden, ³Medical Physics, Molecular Imaging and Department of Surgical Sciences, Uppsala University Hospital, Uppsala, Sweden

Synopsis

Keywords: Image Reconstruction, Data Processing, Phase unwrapping

Motivation: Phase unwrapping 4D flow MRI may alleviate time consuming manual identification of velocity aliasing and the need for re-acquisitions.

Goal(s): To apply iterative graph cuts (IGC) to 4D flow MRI.

Approach: A performance comparison between 3D and 4D unwrapping was conducted using retrospectively wrapped 4D flow MRI datasets. The performance of the proposed IGC method was also compared to ROMEO and a Laplacian-based algorithm.

Results: IGC performance improved with unwrapping of 4D flow compared to 3D flow. IGC performed better than, or comparable to, the reference methods in 3D and 4D unwrapping.

Impact: The proposed method shows promise for phase unwrapping 4D flow MRI, extending the dynamic range of 4D flow MRI and reduces the need for multi-VENC acquisitions in clinical cardiac MRI.

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