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Appendix A: VH Measurements
This appendix defines the statistics available using VH IVUS.
Frame Results
Lumen area: cross-sectional area of the lumen for this frame.
Vessel area: cross-sectional area of the vessel for this frame.
Plaque area: cross-sectional area of the plaque for this frame.
# plaque plus (+) media complex = plaque area
# Vessel minus (-) the lumen area = plaque area
% Plaque Burden: Plaque Area divided by Vessel area.
Composition %: does not include the gray area, for example, Fibrous area % = the
fibrous area divided by the sum of all four composition types.
Lumen dia min: smallest (minimum) diameter within this frame.
Lumen dia max: largest (maximum) diameter within this frame.
Lumen dia avg: average diameter within this frame.
Vessel dia min: smallest (minimum) diameter within this frame.
Vessel dia max: largest (maximum) diameter within this frame.
Segment Results
Lumen volume: volume of the lumen within the defined segment.
Vessel volume: volume of the vessel within the defined segment.
Vessel minus (-) Lumen = plaque.
Plaque volume: volume of plaque within the defined segment.
Segment length: length of the defined segment.
Composition %: does not include the gray area.
Lumen dia min: smallest diameter measurement within the defined segment. This
measurement occurs at the frame number displayed.
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