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Table 2: Comparison of ADC_DWI and ADC_{FLAIR DWI}
Tissue and Technique ADC (10⁻⁶ mm² s⁻¹) SNR CNR
Mean σ Mean σ Mean σ
Air 
    DWI 320 58 
    FLAIR DWI 310 40 
    % Difference 3.1 
CSF 
    DWI 3130 220 7.5 1.3 6.3 1.2
    FLAIR DWI 970 330 2.3 0.9 1.3 0.9
    % Difference 69.0 69.3 79.4 
Globus pallidus 
    DWI 840 190 2.0 0.5 0.8 0.6
    FLAIR DWI 730 110 1.7 0.3 0.7 0.4
    % Difference 13.1 15.0 12.5 
Gray matter 
    DWI 880 97 2.1 0.4 0.9 0.4
    FLAIR DWI 750 66 1.8 0.4 0.7 0.4
    % Difference 14.8 14.3 22.2 
Insular cortex 
    DWI 950 91 2.3 0.4 1.1 0.4
    FLAIR DWI 790 44 1.9 0.3 0.8 0.3
    % Difference 16.8 17.4 27.3 
Ischemic tissue 
    DWI 500 99 1.2 0.3 
    FLAIR DWI 460 100 1.1 0.2 
    % Difference 8.0 8.3 
Putamen 
    DWI 710 120 1.7 0.4 0.5 0.4
    FLAIR DWI 640 130 1.5 0.4 0.5 0.4
    % Difference 9.9 11.8 0 
White matter 
    DWI 760 140 1.8 0.4 0.6 0.4
    FLAIR DWI 670 60 1.6 0.3 0.5 0.3
    % Difference 11.8 11.1 16.7 
Note.—One-way ANOVA of ADC_DWI and ADC_{FLAIR DWI} for each tissue showed that all means differed significantly (P < 0.5) for all tissues except the ADC of air, the SNR_ADC of the putamen, and white matter and CNR_ADC of the globus pallidus, putamen, and white matter (P > 0.5).