Evaluation of Nth Order Polynomial Phase Correction in Reprojected Line Scan Phase Contrast MRA

Erik J. Offerman¹, Ioannis Koktzoglou^1,2, Christopher Glielmi³, Robert R. Edelman^1,4

Reprojected Line Scan Phase Contrast (rLSPC) MRA is a technique that produces a coronal cine of blood flow velocity over a large field of view. The quality of the cine is diminished by phase errors; a phase correction (PC) technique is evaluated in vivo. The technique subtracts background phase from each line in the cine using a polynomial fit of defined order. Polynomial PC was performed on rLSPC at orders 1 to 8. Orders were compared to themselves and to no PC using measurements of flow velocity and standard deviation of the background. Improvement of velocity quantification and image quality was seen with polynomial PC; marginal improvement was seen at high orders.