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Figure 2. Schematic drawings of data acquisition and post-processing. Pixels (voxels) of high, intermediate and low intensities on original (positive) images are numbered 1, 2, and 3, respectively. (a,b) Two series are acquired, each with a 5 mm slice interval. The second series is scanned with a 2.5 mm offset from the first one. (c) After interweaving the slices of the two series, a (positive) dataset (Slices 0–5) is created, with the slice interval halved to 2.5 mm and the number of slices doubled. A negative dataset (Slices 0'–5') is also created, changing pixels of low-intensity (numbered 3) into high-intensity. (d) Two thresholds appropriate for displaying originally high intensity pixels in Slices 0–5 and negatively high intensity pixels in Slices 0'–5', correspondingly, remove intermediate and low intensity pixels. Background pixels in both positive and negative datasets are not displayed. The remaining pixels (voxels) are areas of interest, which can then be fused into a single 3D image (not shown here), restoring the original spatial relationship between pixels (voxels) 1 s and 3 s.
