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Abstract #2476

Advanced respiratory navigator strategies for 4D flow MRI

Pim van Ooij 1 , Edouard Semaan 1 , Zoran Stankovic 1 , Susanne Schnell 1 , Shivraman Giri 2 , Alex J Barker 1 , and Michael Markl 1,3

1 Radiology, Northwestern University, Chicago, IL, United States, 2 Siemens Healthcare, Chicago, IL, United States, 3 Biomedical Engineering, Northwestern University, Chicago, IL, United States

To avoid breathing artifacts in 4D flow MRI, respiratory motion is controlled by a navigator placed on the diaphragm. Scan efficiency and scan time can be highly variable between subjects. A novel navigator strategy is proposed allowing for fixed scan efficiency and scan time by adjusting the lower threshold of the acceptance window according to a user-defined acceptance percentage. 4D flow MRI was performed with user-defined acceptance percentages of 60%, 80% and 100% and compared with conventional navigator settings. No differences were found in image quality or flow quantification while avoiding scan time uncertainties in 4D flow MRI.

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