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Assessment of Vasculature Using Combined MRI and MR Angiography

Kevin J. Roche1,2, Rafael Rivera1, Michael Argilla3, Nancy R. Fefferman1, Lynne P. Pinkney1, Henry Rusinek1 and Nancy B. Genieser1

1 Department of Radiology, New York University Medical Center, Tisch Hospital, IRM-236, 560 First Ave., New York, NY 10016.
2 Present address: Department of Medical Imaging, Hunterdon Medical Center, 2100 Wescott Dr., Flemington, NJ 08822.
3 Department of Pediatrics, New York University Medical Center, Pediatric Cardiology, 530 First Ave., Ste. 9U, New York, NY 10016.



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  		Fig. 1A. —Contrast-enhanced MR angiograms (TR/TE, 4.0/1.6) in 6-year-old boy with nonconfluent pulmonary arteries and right-sided aortic arch with mirror-image branching. Coronal volume-rendered image in left anterior oblique projection shows major aortopulmonary collateral artery (arrow) from left brachiocephalic artery to left pulmonary artery.

 


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  		Fig. 1B. —Contrast-enhanced MR angiograms (TR/TE, 4.0/1.6) in 6-year-old boy with nonconfluent pulmonary arteries and right-sided aortic arch with mirror-image branching. Image in transverse projection shows main pulmonary artery arising from right ventricular outflow tract and supplying right pulmonary artery (straight arrow). Discontinuity with left pulmonary artery (curved arrow) is shown.

 


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  		Fig. 2. —Contrast-enhanced MR angiogram (TR/TE, 4.5/1.9) in 14-year-old boy. Coronal volume-rendered image in right anterior oblique projection shows major aortopulmonary collateral artery (solid straight arrow) from descending aorta that divides into collateral branches (arrowhead) directly supplying right lung and connecting to left pulmonary artery (open arrow). Left upper lobe pulmonary artery is atretic. Minor collateral artery (curved arrow) from descending aorta courses to right upper lobe.

 


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  		Fig. 3. —Axial gradient-recalled echo MR image (TR/TE, 60/4.8) in 12-year-old boy shows major aortopulmonary collateral artery (arrow) to left lung from right-sided descending aorta.

 


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  		Fig. 4A. —Contrast-enhanced MR angiograms (TR/TE, 3.8/1.3) in 4-kg male neonate. Volume-rendered image in left anterior oblique projection shows a single major aortopulmonary collateral artery (arrow) from mid aortic arch.

 


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  		Fig. 4B. —Contrast-enhanced MR angiograms (TR/TE, 3.8/1.3) in 4-kg male neonate. Volume-rendered image in right posterior oblique projection shows major aortopulmonary collateral artery (arrow) entering confluent pulmonary arteries.

 


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  		Fig. 5. —Graph shows highly significant correlation between vessel measurements for conventional angiography and MRI. Multiple r = 0.84, slope = 0.87, p < 0.001, root mean square difference = 0.18 cm, and mean difference = 0.02 cm.

 

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