Figure 1. Radial steady-state free precession MR images (2.5/1.2; flip angle, 45°; temporal resolution, 66 msec per image) obtained with a long-axis view of the left ventricle. Top row: Catheter is clearly visible as a dark structure (arrow) with a small artifact arising from its tip. Bottom row: The catheter was advanced into the left ventricle (left), while still inside the introducer sheath, and then inserted into the myocardium (arrow). During injection of gadodiamide solution (right), there was a growing area of high signal intensity (arrow) within the myocardium surrounding the needle tip.