U60 Diagnostic Ultrasound System User Manual System Control
- 42 -
After entering B+PW, or B+Color/PDI+PW mode, in unsynchronized mode, roll the trackball
to move the sample line and sample area, the B or B+Color/PDI image is active, and PW
image is frozen; when the trackball stops moving, the B or B+Color/PDI image is frozen, and
PW image is active.
To enter PW mode:
1. Press B to enter B mode and adjust all image control settings appropriate for the current exam.
2. Place the cursor inside the vessel of interest.
3. Press PW to display sample line, move the trackball to adjust the sample line, rotate the menu
controls to adjust the sample volume, and the correction angle, etc.
4. Press PW again to enter B+PW mode. The system locks the sample volume indicator and
adds the Time Series window.
Or, you can scan in PW mode as follows:
1. Press B to enter B mode, after optimizing the B mode image, press user defined keys
F1/F2/F3/F4(if the button is defined as “display or hide the sample line”is system preset )
on PC keyboard to display the sample line;
2. Move the trackball to adjust the sample line, place the sample gate inside the vessel of interest.
Rotate the menu controls to adjust the sample volume, and the correction angle, etc.
3. Press PW to enter B+PW mode.
HPRF Mode:
HPRF (High Pulse Repetition Frequency) is a special operating mode of PW Doppler. You can
activate the HPRF mode when detected velocities exceed the processing capabilities of the
currently selected PW Doppler scale or when the selected anatomical site is too deep for the
selected PW Doppler scale.
In order to detect the higher velocities in HPRF, the system changes the PW processing in a way
that makes it ambiguous as to the location of the PW sample volume. In order to allow for proper
interrogation of the target anatomy, the system will display additional sample volumes (also
known as virtual gates) along the sample line. These additional sample volumes are annotated as
an = sign, but without the angle correction line. The displayed Doppler signal will have
information from all sample volumes included. To avoid having unexpected data included in the
Doppler trace, use B or C mode to ensure that the virtual gates do not coincide with locations of
potential flow.
To Next Page
Loading...
