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FIG 1. Initial DW image and ADC maps at 4.5 hours and follow-up T2-weighted image at 7 days after symptom onset in a patient with acute left MCA infarction. Initial DW image lesion, or ROIDW image CORE (red ROI), was smaller than the final infarct, or ROIFINAL (blue ROI). Initial hyperintense lesion in the left insula is not obvious on the follow-up T2-weighted image at this level. Infarct growth volume was 6.1 cm3 (initial DW image volume, 27.9 cm3; final volume, 34.1 cm3). Quantitative DW images and ADC maps show color-coded regions of infarct growth not identified on initial maps and were generated by using pixel-based cutoff values of ADC ratio of 0.79 and signal intensity ratio of 1.19. Color-coded signals are also seen in the unaffected areas on quantitative DW image or ADC map by using these thresholds and were ignored in the analysis.
