FujiFilm VisualSonics Vevo MD, User Manual

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M-Mode acquisition and analysis
Motion mode (M-Mode) provides the trace of a line from the 2D image displayed over
time. A single beam of ultrasound is transmitted, and reflected signals are displayed
as dots of varying intensities, creating lines across the screen.
M-Mode works fundamentally differently than 2D. Where 2D is a frame-based image
that uses multiple scanning beams to create its image, M-Mode is a time-based image
that uses just one beam.
So, when you have guided your transducer beam to the depth that gives you a proper
cross-section of a vein or artery, you can then set M-Mode to lay its single beam
across that cross-section. In effect, it is like positioning a tight string through the vein
or artery, and recording the movement of the structure cross-sections along that
string.
This way, the movement of the vein or artery structures move up and down that single
line so you can then take measurements along that line over time.
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