Figure 5a. Use of a torso coil to increase signal. (a) Horizontal short-axis spin-echo MR image (two signals acquired) of a 68-year-old man with an infiltrating sarcoma (S) of the posterior wall of the left ventricle (LV) shows a clear difference in signal intensity between the epicardial fat and the free-wall myocardium of the right ventricle (arrowheads). The left main coronary artery is seen in cross section (arrow). Note the increased signal intensity of the anterior chest wall compared with that of the posterior chest wall. (b) Spin-echo MR image (same section as in a, four signals acquired) of a 50-year-old man evaluated for tricuspid regurgitation shows interventricular septal trabeculae in the right ventricle (arrows). However, the diagnostic quality of both images is nearly equal.