EDAN DUS 60 - Page 65

DUS 60 Digital Ultrasonic Diagnostic Imaging System Service Manual
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9 Zoom
The displayed zoom box can be placed over the entire B image area,
also the size and the position of the zoom box can be changed.
10 THI
Press this key on the control panel to switch on / off the Tissue
Harmonic Image function in B mode provided the active probe allows
this function.
11 Focus Number
Increase the number of transmit focal zone, so that you can tighten
up the beam for a specific area.
12 Focus Position
To select the depth position of the actual focus zone(s). Arrows at the
left edge of the B image mark the active focal zone(s) by their depth
position.
13 Angle
Use this control to select a part of interest of the B image. The
advantage of the decreased field-of-view is an increased B frame
rate due to the smaller sector width.
14 Scan mode
Use this control to select the scan mode, high density or high
frequency.
15
Screen Format
Press these keys to change the display mode from single B to dual,
or quad display mode.
16 Dynamic Range
Dynamic Range controls how echo intensities are converted to
shades of gray, thereby increasing the adjustable range of contrast.
17 Edge Enhance
This brings out subtle tissue differences and boundaries by
enhancing the gray scale differences corresponding to the edges of
structures. Adjustments to B mode’s edge enhancement affects the B
mode only.
18 Smooth This has the effect of presenting a smoother image.
19 Persist
This is a temporal filter that averages frames together. This has the
effect of presenting a smoother, softer image.
20 Line Average This is a temporal filter that averages lines together.
21 Rejection
Selects a level below which echoes will not be amplified (an echo
must have a certain minimum amplitude before it will be processed.)
22 Gray Map Selects a level.
Table 4-1 B mode checks
 B/M mode and M mode checks
Step Task Expected Results
1 M mark To make the fixed M mark turn to be adjustable in the B image.
2 Gain
Rotate the Gain Knob to adjust the sensitivity (brightness) of the
entire image.
3 Acoustic Power Optimizes image quality and allows user to reduce beam intensity.
4 Depth Common with B mode Depth.
5 M Sweep
By adjusting up or down, four different sweep speeds can be
selected.
6 Frequency
To adjust the range of the receive frequency.
High resolution / lower penetration, mid resolution / mid penetration,
low resolution / high penetration.
7 Scan Mode
Use this control to select the scan mode, high density or high
frequency.