Figure 2From: Distribution of ultrasonic radiofrequency signal amplitude detects lipids in atherosclerotic plaque of coronary arteries: an ex-vivo study Radiofrequency signal sampling and calculation of mean power. Left: Sixteen scan lines from the transducer were placed within each small ROI (an angle of 5.6 degrees), which had a depth of 0.05 mm. Right: The sum of the 16 mean signal powers was calculated as the mean IB value of each ROI.Back to article page