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Figure 3 Relationship Between True Orifice Area and VC Area
Vena contracta (VC) area assessed from an imaging window either parallel (apical equivalent) or perpendicular (parasternal equivalent) to the long axis of flow in the in vitro model. For individual orifice shapes, the VC area measurements were different (p < 0.05) for only the smallest circle orifice. This statistical difference is likely related to the small variance of those small area measurements. Combining all orifice shapes, VC area assessed from the image window perpendicular to flow was more accurate and statistically different (p < 0.05) from the VC area assessed from the parallel imaging window. Orange bar indicates the actual area for each orifice.
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