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FIG 1. DW image, FLAIR DW image and corresponding ADC maps from one patient illustrate differences in ischemic tissue conspicuity (solid arrow) and in insular cortex appearance (dotted arrow). On the ADC maps (middle row), elevated signal intensity in air (noise) is observed with the use of a magnitude threshold of 0 for calculating the ADC. Typically, a magnitude threshold of 20% is used in clinical practice to remove such noise. Third row shows such thresholded ADC maps; greater noise is evident on ADCFLAIRDWI than on ADCDWI.
