Flow Comp Direction

Select a Flow Comp Direction with FSE acquisitions to prescribe a direction to reduce flow artifacts.

Choose one direction to apply the flow comp gradient: slice selection or frequency encoding.

• The system suggests a direction based on the scan plane.
  • With sagittal or coronal scan planes, frequency is the default.
  • With an axial scan plane, slice is the default.
  • With oblique scan planes, no default is selected.
• The flow compensation direction should match the direction of the flowing protons. For example, a sagittal spine should have the same frequency axis as the flow compensation direction, which is head to foot, the direction of Cerebral Spinal Fluid (CSF) and blood flow. Only one direction can be selected.
• A pre-defined flow compensation direction selection from a protocol, previous series, or scan takes precedence over these defaults.
• The flow compensation gradient is applied in the frequency or slice direction only. If phase and frequency have been swapped, the flow motion runs in the phase direction of the image and flow comp is then ineffective.