Skip to main content
. Author manuscript; available in PMC: 2009 Nov 25.
Published in final edited form as: Magn Reson Imaging. 2008 May 7;26(7):897–904. doi: 10.1016/j.mri.2008.01.042

Figure 1.

Figure 1

Column excitation scheme used to suppress the water signal in a LSDI sequence. Column cross sections in the yz-plane are indicated by rhomboids. As with the conventional LSDI sequence, repetitive column excitation at time intervals TRC is accomplished with slice-selective 90° and 180° radio-frequency (RF) pulses. Immediately after column selection and signal readout, an additional slice-selective 180° RF pulse is applied to selectively invert the magnetization within a column that will be scanned later. After each time interval TRC the position of the scanned column and the column with inverted magnetization is incremented. In the scheme shown here and for the protocol used, the column inverted at t = 0 is scanned at t = 11TRC. After the column excitation has reached the edge of the field-of-view (FOV), excitation continues on the opposite side. To avoid cross-talk between columns, there is a gap between sequentially scanned columns. The gaps between the columns are then scanned in two additional sweeps across the FOV.