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Figure 6: Projection data acquired by placing a 6-mm lead-shielded I-123 source in the SPECT scanner: (a) for energy window 1 (143-175 keV) in a 64 × 64 matrix size, data for energy window 2 (184-216 keV) looks similar to (a) (not shown); (b) the ratio (k map) of the two energy windows in a 32 × 32 matrix size; (c) 1/P maps in a 64 × 64 (c) and (d) 8 × 8 matrix size. The P-values correspond to Bonferroni-corrected double-sided significance levels. A 1/P value of 20 corresponds to a significance level of 5%. Negative P-values indicate negative differences.

Figure 6: Projection data acquired by placing a 6-mm lead-shielded I-123 source in the SPECT scanner: (a) for energy window 1 (143-175 keV) in a 64 × 64 matrix size, data for energy window 2 (184-216 keV) looks similar to (a) (not shown); (b) the ratio (k map) of the two energy windows in a 32 × 32 matrix size; (c) 1/P maps in a 64 × 64 (c) and (d) 8 × 8 matrix size. The P-values correspond to Bonferroni-corrected double-sided significance levels. A 1/P value of 20 corresponds to a significance level of 5%. Negative P-values indicate negative differences.