(A) In MPRAGE with linear ordering, four imaging scan echoes (dashed green) were removed from the echo train to accommodate for four guidance lines (yellow) located near the center of k-space. The single-shot, low-resolution MPRAGE scout (TA=3 sec) is acquired with linear sampling and matches the contrast of the guidance samples. (B) In 2D TSE (T2w), standard distributed ordering is used, and two guidance lines are appended at the end of each echo train. The single-shot scout scan matches the contrast of the guidance lines, here heavily T2w due to long TE~200 ms.