In A-mode, the strength of the echo signal is represented by which feature?

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Sharpen your skills for the Davies Publishing SPI Test with targeted flashcards and multiple-choice questions, complete with hints and clarifications. Prepare thoroughly for success!

Multiple Choice

In A-mode, the strength of the echo signal is represented by which feature?

Explanation:
In A-mode ultrasound, echoes appear as spikes, and the height of each spike encodes how strong that echo is—the amplitude of the returning signal. A stronger reflection from a tissue interface produces a taller spike, while a weaker reflection yields a shorter one. The horizontal position of the spike marks depth (time-of-flight), but the height specifically conveys echo strength. The idea of brightness isn’t used in A-mode (that pertains to other modes like B-mode), and the distance between spikes reflects spacing of reflectors in depth, not their strength. So the height of the spike best represents the echo strength.

In A-mode ultrasound, echoes appear as spikes, and the height of each spike encodes how strong that echo is—the amplitude of the returning signal. A stronger reflection from a tissue interface produces a taller spike, while a weaker reflection yields a shorter one. The horizontal position of the spike marks depth (time-of-flight), but the height specifically conveys echo strength. The idea of brightness isn’t used in A-mode (that pertains to other modes like B-mode), and the distance between spikes reflects spacing of reflectors in depth, not their strength. So the height of the spike best represents the echo strength.

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