Pulmonary Valve Area by PISA Formation
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Calcs>Pulmonary Stenosis>PVA by PISA>1
PISA Radius (r)(cm): cm
Aliasing Velocity (VA)(cm/sec) cm /sec
 Vmax (m/sec) m/sec
Angle () degrees

Pulmonary Valve Area cm2

How to get an PVA by PISA.
Step 1: Obtain a Zoomed CFD of the PV in the Aortic Arch SAX or Deep Transgastric view. If there is a sufficiently stenosed pulmonary valve, a PISA formation will occur. The distance from the center of the PISA formation to it's first aliasing velocity edge (where the color shifts from blue to red) is the radius of the PISA formation.
Step 2: Note the aliasing velocity. The aliasing velocity is the velocity where if the flow exceeds this velocity the flow will be displayed with colors from the opposite scale. 
Step 3: Obtain a continuous wave doppler (CWD) of the aortic valve. The CWD of the pulmonary valve will yield a flow profile where, utilizing the calipers (or you can trace it) to show the peak velocity.
Step 4: Obtain an angle of the PISA formation: The angle at the pulmonary valve is typically 180 degrees, whereas the angle at the mitral valve (for mitral stenosis calculations) is typically 120 degrees.

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