3-6 General Measurement
5. Press <Set> twice to set the end point of the spline.
3.2.9 Ratio (D)
Function: Measures the lengths of two line segments and then calculates their ratio.
1. Click [Ratio (D)] in the measurement menu, and the cursor appears on the screen.
2. Measure the length of the two line segments, see "3.2.2 Distance" for detailed procedures.
The result displays in the result window after the measurement of the second line is completed.
3.2.10 Ratio (A)
Function: Measures the area of two closed regions and then calculates their ratio. The methods
are Ellipse, Cross, Spline.
1. Select [Ratio (A)] (tools including Ratio (Area Ellipse), Ratio (Area Spline), Ratio (Area Cross))
in the menu. The cursor appears on the screen.
2. Measure the area of the two closed regions, see "3.2.4 Area" for detailed procedures.
3.2.11 B-Hist
Function: Measures and counts the gray distribution of ultrasonic echo signals within a closed
region. The methods to set a closed region are Ellipse, Trace, Spline and Rect (Rectangle).
Tips: The following operations are performed on Freeze images by default.
Rectangle
Rect sets a rectangle with two points on the cross. The operations are:
1. Click [B-Hist (Rectangle)] in the measurement menu, and the cursor appears on the screen.
2. Move the cursor to the first vertex of the rectangle, press <Set>.
3. Move the cursor to the second vertex of the rectangle, press <Set>. The result is shown in the
following figure:
Where,
Horizontal axis: The gray of the image
The vertical axis: The gray distribution percentage.
No: The number of the graph. The last two results will be displayed
on the screen.
N: The total pixel number in the area to be measured.
M:
M ＝∑Di / N；
MAX: MAX = the pixel number in the maximum gray/ N×100%
SD: Standard deviation. SD=(∑Di
2
/N-(∑Di/N)
2
)
1/2
Di: The gray at each pixel point;
∑Di: The total grays of all pixels.
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