Keywords: Parkinson's Disease, Neurodegeneration
Motivation: At 7T, due to increased sensitivity to flow and pulsation artifacts, the display of the Swallowtail Sign by SWI is not sufficiently excellent and shows significant individual variations.
Goal(s): Identify sequences that can clearly display the Swallowtail Sign in 7T MRI.
Approach: Experienced radiologists evaluate whether the Swallowtail Sign displayed by SWI, 3D T2WI SPACE, 3D fluid attenuation inversion recovery (FLAIR) SPACE, and Dual Echo Steady-State (DESS) is clear, and provide a 5-scale score.
Results: DESS (echo2) and FLAIR_SPACE provide a clearer display of the Swallowtail Sign compared to SWI.
Impact: Compared to the commonly used SWI sequence (at 1.5T and 3T) for observing the Swallowtail Sign, DESS (echo2) and FLAIR_SPACE can display the Swallowtail Sign more clearly at 7T.
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