B-K Medical Pro Focus 2202, Руководство пользователя

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122 Chapter 7
Focus
The ultrasound image is focused very sharply within a selected zone, while the rest
of the image is not as well focused. The Pro Focus can use either a single focal zone
or multiple (up to 8) focal zones (multiple focusing).
Multiple
focus and
resolution
When more than one focal zone is active, ultrasound beams are focused at different
depths in the tissue. This improves the focus in several zones. However, using more
focal zones gives a lower frame rate. Thus using multiple focal zones when there is
much tissue movement causes the image to be blurred.
The Focus indicator to the left of the image shows the extent (range) of the focal
region as well as the points of best focus.
Figure 7-2. The Focus indicator.
The focal point triangle indicates the depth of the image that is in best focus – the
focal point. If there is more than one focal point (composite focus), the number of
triangles indicates the number of focal points (but not necessarily their position,
because this is automatically optimized).
You can adjust both the position and range of the area in best focus. You can also
select the number of focus zones.
To adjust focus position:
To move the focus up or down on the image, select the focus indicator and drag it
vertically to the desired position on the image.
1
Select the Focus indicator by clicking on it or pressing
[
o
]
.
2 Drag the Focus indicator to the desired position.
3
Click.
To adjust focal range:
• Point at the Focus indicator and press
[
+/-
]
.
or
•
Click one of the focus boundary indicators. Drag it and click, or press
[
+/-
]
.
Any changes you make to focus settings can be saved in a Diagnostic Setup.
focal point – indicates the depth of
the image that is in best focus
upper boundary
lower boundary