Figure 5

Assessment of left ventricular fibrosis by calibrated integrated backscatter (IB) in the parasternal long axis view. A 9 × 9 pixel sample volume is placed in the mid-myocardium of the basal anteroseptum, posterior wall, and pericardium, and is tracked throughout the cardiac cycle. In this example, calibrated IB for the anteroseptum is obtained by subtracting average pericardial IB intensity (−3.3 dB) from average myocardial IB intensity of the septum (−19.2 dB), which results in a calibrated IB for the septum of −15.9 dB.