Article Figures & Data
Figures
- FIGURE 1.
Fitted profiles after convolution with size of point source (zoom, ×2.5; pixel size, ∼0.5 mm). Kernels are displayed in linear (A) and logarithmic (B) scales.
- FIGURE 2.
Qualitative impact of RM at 2 axial locations at center (A) and at 4 cm off center of FOV axially (B). Images without RM were reconstructed using 12 iterations of 16 subsets, whereas images with RM were reconstructed using 40 iterations of 16 subsets.
- FIGURE 3.
Axial, sagittal, and coronal planes of 3 point sources reconstructed with different resolution kernels (using 15 iterations of 16 subsets), with zoom on 1 point source in last column. Panels A, B, C, and D are reconstructed with 3-parameter kernel of size 33, 53, 93, and 153 voxels and E with 2-parameter kernel of size 153 voxels. Note that color scale was stretched to assist visualization of artifacts.
- FIGURE 4.
Impact of RM on CRC and noise properties, without (A) and with (B) postreconstruction smoothing. Each color corresponds to different sphere. RM-OP-OSEM curves are represented by filled symbols and solid lines and OP-OSEM curve by hollow symbols and dashed lines. Iteration numbers are shown for smallest sphere in A.
- FIGURE 5.
Impact of RM on noise properties. (A) Mean (first row) and variance images (second row) over all 36 realizations, for OP-OSEM (first column, 12 iterations of 16 subsets), OP-OSEM (12 iterations of 16 subsets) with 2-mm FWHM gaussian postreconstruction smoothing (second column), and RM-OP-OSEM (last column, 16 iterations of 16 subsets). (B) Covariance in summed planes on homogeneous background region.
- FIGURE 6.
Time-averaged images (A) and corresponding VOI time–activity curves (B) for subject. In A, images across striatum were reconstructed with OP-OSEM (first row, 12 iterations of 16 subsets), OP-OSEM (12 iterations of 16 subsets) followed by a postreconstruction smoothing with 2-mm FWHM gaussian kernel (second row), and RM-OP-OSEM (last row, 15 iterations of 16 subsets).
Tables
Kernel size (offset axially) 2 weighted exponentials Single exponential 3 × 3 × 3 5 × 5 × 5 9 × 9 × 9 15 × 15 × 15 15 × 15 × 15 1 cm 0.79 0.29 0.08 0.01 0.04 5 cm 0.78 0.28 0.08 0.01 0.04 10 cm 0.91 0.32 0.09 0.02 0.04 Parameter Caudate Putamen Ventral striatum Without RM 9.11 (0.6) 10.25 (1.3) 7.1 (0.8) With RM 11.34 (0.7) 12.60 (1.7) 7.8 (1.1) Corresponding SDs are in parentheses.
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