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European Radiology Experimental
Fig. 2 | European Radiology Experimental

Fig. 2

From: Thin-slice reverse encoding distortion correction DWI facilitates visualization of non-functioning pituitary neuroendocrine tumor (PitNET)/pituitary adenoma and surrounding normal structures

Fig. 2

Schematic image of generation of shift maps (a) and generation of three DWIs: AP-DWI, B0-corrected-DWI, and RDC-DWI (b). Shift map (B0) is generated using the b = 0 s/mm2 images with anterior-posterior (AP) and posterior-anterior (PA) phase-encoding directions (a, yellow). Shift maps (B0 + Eddy) are generated using the shift map (B0) and the b = 1,000 s/mm2 images with AP and PA phase-encoding directions after application of three orthogonal motion probing gradients (MPGs) (a, red, blue, and green). AP-DWI is an original EPI-based DWI without distortion correction (b, top). B0-corrected-DWI is generated using the b = 0 s/mm2 images with both phase-encoding directions (AP and PA), the b = 1,000 s/mm2 images with AP phase-encoding direction, and the shift map (B0) (b, middle). RDC-DWI was generated using the b = 0 s/mm2 images with both phase-encoding directions (AP and PA), the b = 1,000 s/mm2 images with both phase-encoding directions (AP and PA), and the shift maps (B0 + Eddy) with MPGs in three directions (b, bottom). AP, Anterior-posterior; DWI, Diffusion-weighted imaging; EPI, Echo-planar imaging; MPG, Motion probing gradient; PA, Posterior-anterior; RDC-DWI, Reverse encoding distortion correction DWI

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