Lateral resolution is good within the ______.

Lateral resolution is good within the ______.

• A. Focal Zone
• B. Near Field
• C. Far Field
• D. Outer Region

Answer: (A)

Lateral resolution depends on how narrow the ultrasound beam is as it travels sideways from the transducer. It is best within the focal zone, the region around the focus where the beam width is smallest. When the beam is narrow, two closely spaced structures side by side reflect echoes that remain separate, so the imaging system can distinguish them more clearly. As you move outside this zone—toward the near field before the focus or into the far field after the focus—the beam widens, and the ability to separate adjacent structures decreases.

Lateral resolution depends on how narrow the ultrasound beam is as it travels sideways from the transducer. It is best within the focal zone, the region around the focus where the beam width is smallest. When the beam is narrow, two closely spaced structures side by side reflect echoes that remain separate, so the imaging system can distinguish them more clearly. As you move outside this zone—toward the near field before the focus or into the far field after the focus—the beam widens, and the ability to separate adjacent structures decreases.