Imagine shining a flashlight on a wall; the brightness you perceive depends on focusing energy over a small area. In the realm of ultrasound, this brightness analogy helps us understand the concept of intensity. Just like the flashlight's beam, the intensity in ultrasound determines the clarity of the image produced. When the intensity is high, the ultrasound image appears brighter and clearer. Conversely, if the intensity is low, the image may seem dim or fuzzy.