Figure 7
Tagging by consecutive application of 1-D tagging in orthogonal axes. (a) 2-D case. Instead of applying tagging in two orthogonal axes in the same scan (to create a grid tagged pattern), two 1-D tagging scans are conducted consecutively, so that only a small portion of k-space that includes the signal peaks is acquired each time, instead of acquiring the whole k-space in the first case. (b) Extension to 3-D case. Instead of applying tagging in three orthogonal directions in the same scan, three consecutive 1-D tagging scans are conducted consecutively to significantly save data acquisition time. (c) The three orthogonal 1-D tagged images. Short-axis slices are tagged in both horizontal and vertical directions in two separate acquisitions, and four-chamber images are tagged in the horizontal direction. The displacement information from all three sets of images are combined together to obtain 3-D displacement information.