Keywords: Artifacts, Velocity & Flow, acquisition order; angiography
Motivation: Non-contrast-enhanced time-of-flight (TOF) at 7T greatly improves the delineation of small vessels but is impaired by pulsation artifacts.
Goal(s): Our goal was to reduce pulsation artifacts in 3D TOF to better delineate vessels.
Approach: We recently developed “local-scrambling” which generates semi-random acquisition ordering to reduce artifacts from semi-periodic local signal fluctuations. This local-scrambling was tested in 3D TOF to reduce pulsatile blood flow artifacts in human scanning at 7T.
Results: Artifacts from pulsatile blood flow were significantly reduced using the new local-scrambling (of the 2D phase encodes), both for line-by-line and center-out acquisitions. The method can be of special interest for high-resolution angiography.
Impact: Increased resolution of non-contrast-enhanced time-of-flight (TOF) can provide more accurate vessels delineation. A new local-scrambling acquisition scheme can significantly improve 3D angiography by reducing interference noise and pulsation artifacts without requiring any changes to the reconstruction scheme.
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