Time-Resolved Three-Dimensional Contrast-Enhanced Magnetic Resonance Angiography in Patients with Chronic Expanding and Stable Aortic Dissections

Figure 2

Time-intensity curves as measured by time-resolved MRA in representative patients with chronic expanding aortic dissection (a) and chronic stable aortic dissection (b). -axis is plotted in minutes; -axis is dimensionless with 1 representing peak enhancement. For each patient, two curves are shown. The continuous line represents the intensity in the nondissected proximal aorta; the dashed line represents the intensity in the false lumen at the level of the diaphragm. Time to peak (TTP) and full width at half maximum (FWHM) are illustrated for the dashed curve. Upward and downward slopes (in blue) are visualized for the continuous line on the left.

(a)

(b)