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Table 1: Comparison of DWI and FLAIR DWI b = 1500 s/mm² images
Tissue and Technique SI SNR CNR
Mean σ Mean σ Mean σ
Air 
    DWI 48.4 15.2 
    FLAIR DWI 54.0 18.5 
    % Difference −11.6 
CSF 
    DWI 57.9 24.6 2.2 0.5 −23.3 5.2
    FLAIR DWI 48.0 18.3 1.7 0.3 −14.9 3.9
    % Difference 17.1 22.7 36.1 
Globus pallidus 
    DWI 140.3 61.7 5.5 1.8 −20.0 4.2
    FLAIR DWI 120.0 49.5 4.5 1.3 −12.2 3.7
    % Difference 14.5 18.2 39.0 
Gray matter 
    DWI 336.1 117.5 13.2 2.9 −12.2 3.5
    FLAIR DWI 236.4 78.4 8.8 1.9 −7.8 3.5
    % Difference 29.7 33.3 36.1 
Insular cortex 
    DWI 409.8 148.9 15.9 3.1 −9.6 4.5
    FLAIR DWI 255.5 81.8 9.5 1.9 −7.1 3.8
    % Difference 37.7 40.3 26.0 
Ischemic tissue 
    DWI 654.3 237.0 25.5 5.1 
    FLAIR DWI 456.7 183.6 16.6 4.0 
    % Difference 30.2 34.9 
Putamen 
    DWI 229.0 98.5 8.8 2.3 −16.6 4.9
    FLAIR DWI 155.3 61.3 5.8 1.7 −10.8 3.8
    % Difference 32.2 34.1 34.9 
White matter 
    DWI 407.5 148.0 16.0 3.8 −9.5 4.3
    FLAIR DWI 346.7 124.4 12.8 2.5 −3.8 3.2
    % Difference 14.9 20.0 60.0 
Note.—One-way ANOVA of DWI and FLAIR DWI for each tissue showed that all means differed significantly with (P < .001) except for the mean SI and SNR of the globus pallidus (P < .05) and the CNR of the insula (P < .05). CNRs reported are negative because the ischemic tissue has the most intense signal on the image.