Measurement and Calculation
8-20
displayed in two lines in the result area.
8.3.3.4 Simpson-vol.
In Simpson-vol., the enclosed area acquired by Trace method is divided into several
equal parts (5 pixels apart here) along the long axis. Each part is regarded as a volume of
a cylinder for calculation the volume. The accumulated cylinder volume of all parts is an
approximate volume of the whole area.
Simpson-vol. can be used in B, 2B, 4B or B/M mode. Follow the steps of Trace-area to
acquire an enclosed area. Press
Enter to confirm and display a straight line as a long
axis between the two points with the longest distance in the area. The user can adjust the
position of the long axis by using the touchpad. In the adjust process, two ends of the
straight line are kept on the border of the area. “aVolume: cm
3
“ is displayed in the result
area. The measuring result changes with the adjustment of the long axis position.
8.3.3.5 LDW-vol.
LDW-vol. calculates volume by successively measuring its length, width and height. Such
measurement is performed in B mode, and the operation is similar to line measurement.
“aVolume: 0.00
cm
3
”, “aL: 0.00cm”, “aD: 0.00cm”, “aW: 0.00cm” will be displayed in four
lines in the result area.
8.3.4 Histogram
Based on experiment statistics, the probability distribution density graph comes from
statistics is called a histogram. In ultrasound medical imaging, probability distribution
refers to grayscale probability distribution.
Fig. 8-5 Histogram Display
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