ECO 6 Digital Color Doppler Ultrasound System
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real-time status. Pressing it again can switch the real-time status among four images.
5.5.4
B/M Mode
Press [
M
] button, a real time B-mode image and a real-time M-mode image will be displayed at the same time.
And a sample line will appear in the B-mode image area, which indicates the active sample position for M
image on the B image area. Move the sampling line by trackball.
5.5.5
M Mode
Press [
M
] key again, B mode image will disappear; M mode image is still active on the whole screen. M mode
image stands for the tissue movement status at the sampling line. The M mode image varies with time, so it is
mainly used for cardiac applications.
5.5.6
CFM Mode
CFM is a Doppler mode intended to add color-coded qualitative information concerning the relative velocity
and direction of fluid motion within the B mode image.
CFM is useful to see flow in a broad area. It allows visualization of flow in the CROI, whereas Doppler mode
provides spectral information in a smaller area. CFM is also used a stepping stone to Doppler mode. You can
use CFM to locate flow and vessels prior to activating Doppler.
In CFM mode, move the trackball to change the position of sampling box. Activate the [
Steering Angle
] and
rotate the [
MENU
] knob to adjust the angle of color sampling box (if current probe is linear probe). Press
[
ENTER
] key to fix the position of color sampling box. At this time adjusts the size of color sampling box
through moving trackball. Press [
ENTER
] key again and move trackball to change the color sampling position
again.
Press [
C
] key to enter into CFM mode; after [
C
] key light is on, rotate the [
GAIN
] knob for adjusting the gain
of CFM.
CFM mode Exam Procedure:
Follow the same procedure as described under B mode to locate the anatomical area of interest.
After optimizing the B mode image, add Color Flow.
Move the color region of interest CROI as close to the center of the image as possible.
Optimize the color flow parameters so that a high frame rate can be achieved and appropriate flow velocity
can be visualized.
Press [
FREEZE
] key to hold the image in cine memory.
Record color flow image as necessary.
CFM Scanning Hints:
PRF
: increase/decrease the PRF on the color bar. Imaging of higher velocity flow requires increased velocity
scale values to avoid aliasing
Wall Filter
: affect low flow sensitivity versus motion artifact
Color Map
: allow you to select a specific color map. It shows the direction of the flow and highlights the
higher velocity flows.
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