Samsung SONOACE R3 Instrukcja Użytkownika Pobierz pdf (Strona 399)

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101

Reference Manual 93

VTI(Velocity Time Integral)

ACC(Acceleration), DEC(Deceleration)

AT :Acceleration Time, DT : Deceleration Time, E point : Early Diastolic Flow, A point : Atrial

contraction

Aortic Valve, LVOT Doppler

HR(Heart Rate)

CONT(Continuity Equation)

When there is a constant ow in a ow channel with a Stenosis, the ow volume at the

Stenosis portion equals that at nonstenotic portions .

This equation is valid not only in a constant ow, but also in a pulsality ow channel .

where, SV1 : stroke volume in the nonstenotic area, SV2: stroke volume in the stenotic area

where, AVA(1) : Aortic Valve Area by Velocity, AVA(2) : Aortic Valve Area by VTI, LVOTarea : π

* DiaLVOT2 / 4, VTI1 : Left Ventricle output track VTI, VTI2 : Aortic valve VTI, V1 : Left Ventricle

output track velocity, V2: Aortic valve velocity

Reference : Harvey Feigenbaum, “ Echocardiography”, 1995 fth edition

CSA(Cross Sectional Area)

where, D: diameter

Pulmonic Veins

Reference : Oh, J.K., Seward, J.B., Tajik, A.J. The Echo Manual. Boston: Little, Brown and

Company, 1994, p.48

Diastolic Velocity

Velocity measured at diastole.

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