Cardiology 6-27
6.4.3.3 Mitral Valve Area (MVA)
Mitral Valve Area (MVA) can be calculated by two methods: pressure half time (PHT) or velocity-
time integral (VTI).
Tips: MVA Calculation by PHT method should be performed in CW mode, See MVA(PHT) in
“6.3.3 Doppler Cardiac Measurement” for formula of MVA Calculated by PHT method.
MVA(VTI)
Study Items
Tools Descriptions Operations
LVOT Diam
Left Ventricular Outflow Tract
Diameter
Distance in 2D General Measurements
LVOT VTI
Left Ventricular Outflow Tract
Velocity-Time Integral
D trace in General D measurements
MV VTI Mitral Valve Velocity-Time Integral
Study Results
Except for values in upper table, the following results can be obtained in this study:
Tools Descriptions Formulae
MVA(VTI) Mitral Valve Area
VTI(cm) MV4
)Diam(cm LVOTVTI(cm) LVOT
)mMVA(VTI)(c
22
2
×
××
=
π
Operating Procedures
See table above for methods and formulae of the measurement items.
6.4.3.4 AVA(VTI)
Aortic Valve Area (AVA) can be calculated by velocity-time integral (VTI). Measurements should be
performed on 2D and Doppler image.
Study Items
Tools Descriptions Operations
LVOT Diam
Left Ventricular Outflow Tract
Diameter
Distance in 2D General Measurements
LVOT VTI
Left Ventricular Outflow Tract
Velocity-Time Integral
D trace in General D measurements
AV VTI Aortic Valve Velocity-Time Integral
Study Results
Except for values in upper table, the following results can be obtained in this study:
Tools Descriptions Formulae
AVA(VTI) Aortic Valve Area
VTI(cm) AV4
)Diam(cm LVOTVTI(cm) LVOT
)mAVA(VTI)(c
22
2
×
××
=
π
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