Time-Resolved Three-Dimensional Contrast-Enhanced Magnetic Resonance Angiography in Patients with Chronic Expanding...

Area of Science:

• Cardiovascular Imaging
• Medical Physics
• Radiology

Background:

• Aortic dissection is a serious condition affecting the aorta.
• Chronic aortic dissections can lead to expansion and complications.
• Differentiating between stable and expanding dissections is crucial for patient management.

Purpose of the Study:

• To evaluate if 3D TR-MRA can identify hemodynamic alterations in chronic expanding aortic dissections.
• To compare hemodynamic findings in expanding versus stable aortic dissections.

Main Methods:

• Prospective study of 20 patients with chronic or residual aortic dissection.
• Utilized 3D TR-MRA at 1.5T for aortic imaging and follow-up.
• Analyzed time-intensity curves from regions of interest in the aorta.

Main Results:

• Patients with chronic expanding aortic dissections showed significantly shorter time-to-peak intensity and full width at half maximum in the false lumen.
• Steeper upward and downward slopes of time-intensity curves were observed in the expansion group.
• A shorter delay in peak intensity in the false lumen compared to the ascending aorta was noted in the expansion group.

Conclusions:

• 3D TR-MRA effectively detects significant hemodynamic alterations in the false lumen of chronic expanding aortic dissections.
• These findings help distinguish between expanding and stable aortic dissections.