Fig. 2.

Distortion artifacts observed with single-shot echo planar diffusion-tensor imaging (ss-DTI) for a 36-year old male healthy volunteer. (a) shows the SPACE STIR image with delineation of the root C7 left (arrow) as standard of reference for anatomical correlation; (b), the corresponding ss-DTI image with a distortion artifact in the course of the root C7 left (arrow); in (c) the rs-DTI image depicts the root C7 left without major distortion. In this case, geometrical distortion artifacts for ss-DTI were graded “high”⁴ by both readers, whereas geometrical distortions artifacts for readout-segmented echo planar diffusion-tensor imaging (rs-DTI) were rated “low” by reader 1 and “moderate” by reader 2.