ABDOMINAL ULTrASONOGrAPHy
position to a slight angle, with the top slider set more to
the left (decreasing the overall gain in the near feld) and the
bottom slider more to the right (increasing the overall gain in
the far feld). This should compensate for the loss of US wave
numbers at depth within the tissue.
8. Dynamic Range Control
Dynamic range—or log compression or contrast—controls the
overall grayscale of the image (Figure 5).
• A short dynamic range results in an image that is black and
white with very little grayscale, as one would use for an
echocardiogram.
• A long dynamic range has little contrast and a long grayscale,
which results in many different shades of gray; subtle lesions
may not be apparent (Figure 6).
• An intermediate dynamic range is preferable for the
abdomen.
To increase lesion conspicuity, the sonographer can decrease
FIGURE 5. Two different grayscale maps used for an
US phantom: Map with greater contrast (A) and map
with more latitude or grayscale (B), appropriate for the
abdomen. These 2D grayscale maps are specifc to the
US vendor and machine.
A
B
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November/December 2015 | tvpjournal.com
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