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Fig. 4B. —MR images (TR/TE, 3.03/1.52; flip angle, 40°; 2 images/sec; matrix, 256 x 256; slice thickness, 5 mm) obtained in pig. Coronal oblique 2D true FISP image obtained after catheter (arrow) insertion into right renal artery shows that position of renal artery changed and image plane had to be adjusted. Compared with A, intraarterial signal intensity is reduced after catheter insertion.