Which resolution is degraded when utilizing multiple transmit focal zones?

Which resolution is degraded when utilizing multiple transmit focal zones?
A . Temporal
B . Lateral
C . Axial
D . Elevational

Answer: A

Explanation:

When utilizing multiple transmit focal zones, the ultrasound system must perform multiple transmissions at each focal depth. This process requires more time for data acquisition, which in turn decreases the frame rate. A lower frame rate directly impacts temporal resolution, which is the ability to accurately depict moving structures over time. Thus, using multiple focal zones improves lateral resolution but degrades temporal resolution.

Reference: American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation guidelines.