Flow-induced artifacts in two-point Dixon MRI: Incidence, severity and potential diagnostic pitfalls.
Tilman Schubert1, Peter Bannas2, Samir Sharma3, Sonja Kinner1, Mahdi Rahimi3, Frank Korosec3, and Scott Reeder1
1Radiology, University of Wisconsin Madison, Madison, WI, United States, 2Radiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany, 3Medical Physics, University of Wisconsin Madison, Madison, WI, United States
Chemical shift based two-point “Dixon” MRI with bipolar readout gradients may produce flow induced fat-water misallocation artifacts. These artifacts have the potential to mimic intravascular thrombus. We reviewed 100 cases of two-point body MRI exams to characterize the incidence, location and severity of these artifacts. Artifacts appeared in 46% of the cases, with severe artifacts in 20% and mild artifacts in 26% of the patients. Given this high number of potentially thrombus-mimicking, flow-induced artifacts, radiologists should be aware of this potential pitfall when using two-point fat-water separation methods.
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