Assessment of performance of ICE and IVUS
The time required for imaging and any procedural complications
associated with imaging were recorded as indicators of trackability of
ICE and IVUS catheters.
The imaging quality of each PV cross-section was defined as good,
satisfactory, sub-optimal and poor: good quality if the vessel contour
was visible in all 4 quadrants; satisfactory quality if the vessel
contour was visible in 3 quadrants; sub-optimal quality if the vessel
contour was visible in 2 non-consecutive quadrants; poor quality if not
possible to define the vessel contour as visible only in one quadrant or
in two consecutive quadrants (Figure 2). Poor quality images were
discarded and not considered for quantitative analyses.
The inter-observer agreement for quantitative data was also assessed for
both ICE and IVUS by calculating intraclass correlation coefficient
(ICC) values for different PV measurements.