= M-mode ultrasound scan
{c}
An <M-mode ultrasound scan> repeatedly samples one <pulse-echo ultrasound> beam and places successive depth profiles alongside one another in time. Depth is one display axis and acquisition time the other; echo strength controls brightness. This makes motion along the selected line visible. <Ultrasound Theory Module by FAMUS>[Ultrasound modes, M–mode and Figure 13]{ref}
A stationary interface <traces> a line at constant depth; an oscillating interface <traces> a varying depth. Converting echo delay to depth still assumes a <sound speed> and a return path. This display records one beam over time, whereas a <B-mode ultrasound scan> combines beam lines across space.
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