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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