Article Figures & Data
Figures
- FIGURE 1.
Left image is reconstructed with 5 iterations of MLEM. Middle image is reconstructed with windowed FBP with k = 3,800. Right image is same as middle image except outside object image values are set to zero. Line profiles are for 5 lesions. Solid lines are from windowed FBP images; dashed lines are from MLEM images.
- FIGURE 2.
Left image in each panel is reconstructed with various iterations of MLEM. Middle image is reconstructed with windowed FBP with various value of k. Right image is same as middle image except outside object image values are set to zero. Line profiles are for 5 lesions. Solid lines are from windowed FBP images; dashed lines are from MLEM images. (A) Left: 10 iterations; middle: k = 8,200. (B) Left: 15 iterations; middle: k = 12,000. (C) Left: 20 iterations; middle: k = 17,000. (D) Left: 25 iterations; middle: k = 22,000. (E) Left: 30 iterations; middle: k = 28,000. (F) Left: 35 iterations; middle: k = 33,000. (G) Left: 40 iterations; middle: k = 38,000. (H) Left: 45 iterations; middle: k = 43,000.
Tables
- TABLE 1
Parameters (Fractions of Image Size) for National Electrical Manufacturers Association NU 4-2008 Phantom
x0 (center) y0 (center) A (long-axis) B (short-axis) ϕ (rotation) Image intensity 0.0 0.0 0.60 0.60 0 10 −0.1 −0.3 0.10 0.10 0 10 −0.3 0.05 0.08 0.08 0 10 0.0 0.3 0.06 0.06 0 10 0.3 −0.15 0.04 0.04 0 10 0.3 −0.15 0.02 0.02 0 10 - TABLE 2
Noise Comparison for Reconstructions with MLEM and Windowed FBP, When Images Are at Same Lesion Contrast
Iteration no. for MLEM k for windowed FBP Normalized noise SD for MLEM image Normalized noise SD for windowed FBP image 5 3,800 0.0286 0.0277 10 8,200 0.0544 0.0530 15 12,000 0.0786 0.0711 20 17,000 0.1015 0.0904 25 22,000 0.1233 0.1058 30 28,000 0.1442 0.1205 35 33,000 0.1643 0.1303 40 38,000 0.1837 0.1384 45 43,000 0.2024 0.1452
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