How is Qp Qs measured on MRI

Why is Qp Qs important, and how is it measured on MRI?

In patients with intracardiac shunting, the evaluation of the ratio of pulmonic to systemic blood flow (Qp/Qs) is important because it often determines subsequent therapy. A Qp/Qs of <1.5 is usually managed conservatively in asymptomatic patients. A Qp/Qs of >1.5 in a patient whose pulmonary vascular resistance is not markedly elevated is usually referred for surgical correction. Velocity-encoded images are used to measure left-to-right shunting by comparing the flow in the proximal main pulmonary artery with the flow in the proximal aorta.

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