Tomey UD-600, Operator'S Manual

Page: 86 / 262

3-58
f) Presetting of each gain and contrast
Three groups of presetting values for total gain, contrast, near gain and
far gain are prepared for this instrument
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<Average Settings
A A
A A
A
>
Total gain, contrast, near gain and far gain are set with the standard val-
ues.
<High Contrast
B B
B B
B
>
The images are displayed with clear definitions, provided that, due to its
low gradation, it is not convenient for observation of delicate changes in
the organization of the eye. It is most conveniently used for observation
of the retina.
<Wide Dynamic Range
C C C C C
>
Its high gradation and wide dynamic range are effective for observation
of delicate changes in the organization, except for that unnecessary echo
and arch fact (such as imaginary images which are caused by the reflec-
tion and/or refraction of ultrasound beams). It is, therefore, suitable for
observation of the opacity and bleeding in the inside of the vitreous body.
A
B
C
3.3 B-scan diagnosis
D