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Measuring Percent Difference
This feature provides the ability to compare differences in areas between two grayscale
frames. For example, you can compare the percent difference between the minimum
lumen area on one frame to a reference lumen area on another frame..
The following formula is used to calculate percent difference:
% Difference = 1 – (Target Lumen Area / Reference Lumen Area)
To calculate percent difference, between frames:
– Navigate to the first frame of interest and make an area measurement.
– To use this measurement as a reference, click on the Area 1 box to lock the
measurement.
Figure 40: Draw area on 1st frame of interest
– Navigate to the second frame of interest and make an area measurement.
– Note the Difference measurement between the two is displayed.
– Click Save Frame to save results.
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