Which unfocused transducer will have the greatest divergence?

Which unfocused transducer will have the greatest divergence?
A . 4 mm aperture, 4 MHz
B . 4 mm aperture, 6 MHz
C . 6 mm aperture, 4 MHz
D . 6 mm aperture, 6 MHz

View Answer

Answer: A

Explanation:

Transducer beam divergence is influenced by the aperture size and frequency. A smaller aperture and lower frequency result in greater beam divergence. Among the given options, the transducer with a 4 mm aperture and 4 MHz frequency will have the greatest divergence. This is because the smaller aperture size contributes to a wider beam spread, and the lower frequency also increases the divergence compared to higher frequencies.

Reference: ARDMS Sonography Principles and Instrumentation guidelines Kremkau,

F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.