CMR Regurgitant Calculator

Quantifies aortic, pulmonary, mitral, and tricuspid regurgitation from ventricular stroke volumes and great-vessel phase-contrast flow — with cross-check methods, Qp:Qs, forward LVEF, and an animated flow map.

ByAdeeb Al-QuthamiMD, FSCMR

Ventricular Volumes

LV stroke volume (LVSV)mL

RV stroke volume (RVSV)mL

LV end-diastolic volume (LVEDV)mL · optional

Aortic Phase-Contrast Flow

Total forward (antegrade) flowmL

Diastolic regurgitant flowmL

Pulmonary Phase-Contrast Flow

Total forward (antegrade) flowmL

Diastolic regurgitant flowmL

Enter values to check LVSV / RVSV / AoSV / PaSV concordance.

Aortic (AI)

direct · PC-MR

—

mL · primary (AoRegurg / AoTotal)

—

AI (AoSV − PaSV)—

AI (LVSV − RVSV)—

Pulmonary (PR)

direct · PC-MR

—

mL · primary (PaRegurg / PaTotal)

—

PR (RVSV − LVSV)—

PR (RVSV − AoSV)—

Mitral (MR)

indirect · volumetric

—

mL · primary (LVSV − AoTotal)

—

MR (LVSV − PaSV)—

MR (LVSV − RVSV)—

Tricuspid (TR)

indirect · volumetric

—

mL · primary (RVSV − PaTotal)

—

TR (RVSV − AoSV)—

TR (RVSV − LVSV)—

Qp:Qs

By flow (PaSV / AoSV)

—

By volume (RVSV / LVSV)

—

Flow Map

Qp:Qs —

Shunt level

Systemic forward Pulmonary forward Regurgitant Shunt (PaSV−AoSV)

Schematic cut-away rendering, 1.6 s cycle (systole ≈ first 40%). Blood boluses are phase-timed — ejection and MR/TR in systole, AV inflow and AI/PR in diastole — and sized to volume per beat. Shunt arrow appears when |PaSV − AoSV| exceeds 5 mL and 10% of AoSV; its level cannot be inferred from flows alone — set it from the anatomy.

Phase-Contrast Flow Volumes

through-plane PC-MR

	Forward	Reverse	Net	RF
Aorta	—	—	—	—
Pulmonary	—	—	—	—

Ao SV—

PA SV—

LV SV—

RV SV—

Qp:Qs — —

Waveforms are illustrative; lobe areas are scaled to the entered forward and reverse volumes (net SV = forward − reverse). The pattern chip applies the teaching rule RVSV ≈ PA forward SV (shunt before the AV valves) vs LVSV ≈ PA forward SV (ventricular-level shunt) and reports indeterminate when both are close.

trivial <5% mild 5–15% moderate 16–25% moderate–severe 26–48% severe >48%