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Fig. 4 | European Radiology

Fig. 4

From: ESR Essentials: diffusion-weighted MRI—practice recommendations by the European Society for Magnetic Resonance in Medicine and Biology

Fig. 4

Exemplar 4-scan trace DWI data. DWI images are acquired at a given b-value (here 1000 s/mm2) with diffusion gradients oriented along four different directions (DWI Dir.1-4). The mean DWI image (4-scan trace) is then computed by averaging the DWI images along the four directions, and an ADC map is estimated from it. Arrows indicate signal changes due to tissue anisotropy, mitigated in the 4-scan trace and the corresponding ADC map

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