Tomey UD-600, Operator'S Manual, Page: 57 / 262

3-29
3.3.6 Setting of various gain volumes
Fine adjustment of various gain volumes shall be given as observing the
ultrasound wave image.
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a) CONTRAST volume
A A
A A
A
The contrast of the whole image (white/black contrast) is set.
(Adjustable range: 1 to 60dB)
The higher contrast makes the images having the clearer white and black
color definitions, but, at the same time, lowers the penumbra expression
which makes it difficult to see delicate changes of the organization. The
lower contrast shows the lighter contrast of black and white color defini-
tions which improves the penumbra expression to show the clearer and
more delicate changes of the organization.
b) TOTAL volume
B B
B B
B
The echo sensitivity of the total image is set.
(Adjustable range: 1 to 60dB)
The higher sensitivity not only makes the detection of fine echo reflection
easier, but also makes the occurrence of unnecessary echoes and artifacts
(virtual image which is produced by the reflection and refraction of ultra-
sound beams) easier. On the other hand, the lower sensitivity suppresses
the occurrence of unnecessary echoes and artifacts, but makes it difficult
to detect fine reflective echoes.
c) NEAR volume
C C C C C
The sensitivity of reflecting echo near the anterior area is set.
(Adjustable range: 1 to 40dB)
d) FAR volume
D D D D D
The sensitivity of reflecting echo near the retina and eyeball rear area is
set. (Adjustable range: 1 to 40dB)
3.3 B-scan diagnosis