Figure 1c:

Imaging workflow of x-ray/MR imaging for intrapericardial delivery. (a) Navigator-gated 3D whole-heart MR image (top) was obtained to define ventricular borders for intrapericardial injection, followed by cardiac-gated C-arm CT image (bottom). (b) 3D registration of whole-heart MR imaging and C-arm CT was performed, followed by (c) surface rendering of the ventricles from MR imaging (top) and volume-rendered C-arm CT (bottom) overlaid on (d) a live x-ray fluoroscopic image (top) and fused image (bottom) to guide percutaneous access to the pericardial space.