What is the post Echo phenomenon in ultrasound?

Question

Choose only ONE best answer.

A
The time it takes for the echoes to return varies depending on the distance of the object from the probe
B
The type of sound waves emitted by the transducer
C
The generation of black and white spots on the image

Answer 1

A
The time it takes for the echoes to return varies depending on the distance of the object from the probe