User's Manual

Table Of Contents
9
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 Spectral Doppler Mode Image Controls
InnoSight Ultrasound System
P6992-4, EN, 16/12/6
Using Steer M
Allow steering the sample volume to any angle you choose by adding multiple M-lines, rather than sampling
in a strict vertical position This function is particularly useful in cardiological applications
1 Touch Steer M +
2 A crosshair cursor appears on the image Drag the cursor to where you want to start sampling and
release it
3 Drag the cursor to where you want to end sampling and release it
4 Touch Steer M + to add a second line Repeat step 2-3 to place it Up to 3 M-lines can be added
Adjusting Sweep Speed
Adjust how fast the timeline is scanned across the Time Series window
Touch Speed repeatedly to select a desired velocity
Selecting M Process
Select the detection method processing the M-Mode trace display The system provides retrieving average
or peak scan data from the M-Mode trace
Touch M Process repeatedly to select a desired method
Inverting the M-Mode Trace Display
Invert the M-Mode trace display in relation to brightness
Touch Video Invert to swap the colors on the M-Mode trace display
Spectral Doppler Mode Image Controls
Overview
Pulsed-Wave Doppler (PW) and Continuous Wave Doppler (CW) are collectively called Spectral Doppler
mode A Spectral Doppler scan produces a series of pulses used to study the motion of blood flow
selectively in the region of interest PW/CW modes display scan data of the anatomy in the 2D Imaging
window for monitoring the exact location of the sample volume, and the PW/CW data acquired in the Time
Series window The axis of the graph represents time, and the Y axis represents Doppler frequency shift
The shift in frequency between successive ultrasound pulses, caused mainly by moving red blood cells, can
be converted into velocity and flow if an appropriate angle between the insonating beam and blood flow is
known
PW mode examines blood flow data selectively in a small region along a desired ultrasound cursor (the
Spectral Doppler cursor), called the sample volume or sample gate A short line across the sample volume
is called the Flow Direction cursorThis cursor line should be aligned to the blood flow direction when
measuring the flow velocity