Which statement describes the two measurements obtained from each echo?

Which statement describes the two measurements obtained from each echo?

• A. Time of flight and echo amplitude
• B. Echo color and depth
• C. Frame rate and gain
• D. Tissue stiffness and velocity

Answer: (B)

Each echo carries two kinds of information: where it came from in depth, and what the signal represents as color. The depth is determined by how long the ultrasound pulse takes to travel to the reflector and back (time-of-flight), which is converted into distance using the speed of sound in tissue. The color attached to the echo comes from color mapping used in colorized ultrasound (like color Doppler or other color encodings) to convey additional properties such as flow direction or velocity. So, for every echo, you get its depth location and a color value that encodes another signal characteristic. This combination explains why color and depth are the described measurements.

Each echo carries two kinds of information: where it came from in depth, and what the signal represents as color. The depth is determined by how long the ultrasound pulse takes to travel to the reflector and back (time-of-flight), which is converted into distance using the speed of sound in tissue. The color attached to the echo comes from color mapping used in colorized ultrasound (like color Doppler or other color encodings) to convey additional properties such as flow direction or velocity. So, for every echo, you get its depth location and a color value that encodes another signal characteristic. This combination explains why color and depth are the described measurements.