A mode

A mode

[′ā ′mōd]
(acoustics)
A form of ultrasonic medical tomography that uses acoustic pulse emissions and echo reception along a single line-of-sight axial propagation path and usually displays the information on a cathode-ray oscilloscope in which the horizontal axis of the display is a linear time base, triggered at the time of the transmitted pulse, and the received echoes are manifested as vertical deflections, with vertical displacement a measure of the amplitude of the strength of the returning echo.