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AJNR - American Journal of Neuroradiology

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Fluid-Attenuated Inversion Recovery Preparation: Not an Improvement over Conventional Diffusion-Weighted Imaging at 3T in Acute Ischemic Stroke

Jessica E. Simon^a,b, Diana K. Czechowsky^b, Michael D. Hill^b,c,d, Ashley D. Harris^a,b,e, Alastair M. Buchan^a,b and Richard Frayne^a,b,e

^a Seaman Family MR Research Centre, University of Calgary, Foothills Medical Centre, Calgary, AB T2N 2T9 Canada
^b Department of Clinical Neurosciences, University of Calgary, Foothills Medical Centre, Calgary, AB T2N 2T9 Canada
^c Department of Community Health Sciences, University of Calgary, Foothills Medical Centre, Calgary, AB T2N 2T9 Canada
^d Department of Medicine, University of Calgary, Foothills Medical Centre, Calgary, AB T2N 2T9 Canada
^e Department of Radiology, University of Calgary, Foothills Medical Centre, Calgary, AB T2N 2T9 Canada

View larger version (168K): [in a new window]   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.