4 Setup
Operator’s Manual 4 - 23
3. Select [Next] to Step 2. Select the [App Region] and edit the formula.
Descriptions of the attributes in the dialog box are shown in the following table.
For example, to create a user-defined measurement item (HC/AC):
a. Enter name for the item, such as “calculation 1.”
b. In Region select “Obstetric,” then select the measurement tool sources “2D” and
“Measurement.”
c. Find HC in the “Item Name” list, click to select it, then double-click HC in the Result
Name box on the right side. The index is added to the formula.
d. In the Calculator, click “/” and it is added to the formula.
e. Find AC in the “Item Name” list, click to select it, then double-click AC in Result Name
box on the right side. The index is added to the formula.
The function description is as follows:
Attributes Descriptions
Formula Displays the user-defined formula.
Verify Used to verify if the formula is valid.
Application Region Select the application region for the user-defined item.
Measurement Item All available measurement items of the application region selected in
the previous step.
Calculator/Function You can select from measurement/calculation/study items in 2D/M/
Doppler mode.
Unit Used to enter numbers and functions in the formula.
Function Method Parameter Number Function Description
sin sin(a) 1 Sine (the ratio of the opposite to the
hypotenuse)
cos cos(a) 1 Cosine (the ratio of the adjacent to
the hypotenuse)
tan tan(a) 1 Tangent (the ratio of the opposite to
the adjacent)
atan atan(a) 1 Arctangent (the result is expressed in
radian.)
min min(a,b,...) ≥2 Minimum
max max(a,b,...) ≥2Maximum
sqrt sqrt(a) 1 Square root
pow pow(a,b) 2 Calculate b power of a
exp exp(a) 1 Exponential function with natural
constant e as the base
ln ln(a) 1 Logarithm with natural constant e as
the base
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