Representative coronary artery images for cross sectional area and blood velocity.

<p>Example in a healthy premenopausal woman demonstrating a right coronary artery (RCA) cross section (<b>A</b>) at rest (<b>B</b>) and during isometric handgrip exercise (IHE) showing vasodilation. Magnified flow velocity image of the RCA in the same subject is shown at rest (<b>C</b>) and during IHE (<b>D</b>) in diastole, wherein the signal phase is proportional to flow velocity with the darker pixels during IHE indicating higher velocity in the caudal direction through the RCA. Example in a healthy postmenopausal woman of the RCA cross section (<b>E</b>) at rest (<b>F</b>) and during IHE showing no vasodilation. Flow velocity image of the RCA in the same postmenopausal subject is shown at rest (<b>G</b>) and during IHE (<b>H</b>) in diastole, wherein the signal darkness does not increase during IHE as it does in the younger healthy subject.