B-K Medical Pro Focus 2202, User Manual

Page: 306 / 356

306 Chapter 20
Polygon
measure-
ments
NOTE:
You must click the points in order around the polygon perimeter. You
cannot move a point once you have positioned it. If you backtrack, the polygon
will intersect itself. If this happens, or if you have made another mistake in
drawing the polygon, you must delete the entire measurement (click Undo on the
right of the screen under Measurements) and start over. If you are in the middle
of a volume measurement, the entire volume measurement is deleted, not just the
current polygon.
Deleting Measurements
To delete a measurement:
•
Click Undo under Measurements on the right side of the screen.
The most recent measurement is deleted.
You can click Undo several times to remove more than one measurement.
To restore the measurement that was just deleted:
•
Click Redo under Measurements on the right side of the screen.
To remove all measurements:
•
Click Clear All under Measurements on the right side of the screen.
(Redo will not restore measurements that were deleted with Clear All.)
Measuring Volumes
You measure a volume by drawing polygons around the area of interest on slices
taken throughout the Cube. The method for drawing polygons is not the same as for
2D images.
To make a volume measurement on a 3D Cube:
1 Click Volume under Measurements on the right side of the screen.
2
Click Step Size and set the distance between slices of the Cube that will be used
for the volume measurements. This does not have to be the same as the step size
used for acquisition. (The default step size is 5mm.)
3 Draw a polygon around the area of interest by clicking points on the perimeter.
When you have come to the last point, double-click to indicate that it is the final
point in the polygon. See note above about clicking the points in order.
4
Click Next to move through the volume by the chosen step size.
5 Outline the area of interest in the new slice.
6
Repeat steps 3, 4, and 5 for each slice until the area of interest is no longer visible
(the volume measurement is completed).
The system updates the accumulated volume (in cm
3
) as each polygon is
completed.
7
Click Volume again.