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DOI: 10.1148/radiol.2443061647
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(Radiology 2007;244:907-913.)
© RSNA, 2007

Vascular and Interventional Radiology

Intraindividual Comparison of High-Spatial-Resolution Abdominal MR Angiography at 1.5 T and 3.0 T: Initial Experience1

Henrik J. Michaely, MD, Harald Kramer, MD, Olaf Dietrich, PhD, Kambiz Nael, MD, Klaus-Peter Lodemann, PhD, Maximilian F. Reiser, MD, and Stefan O. Schoenberg, MD

1 From the Institute of Clinical Radiology, University Hospitals Grosshadern, Ludwig-Maximilians-University Munich, Marchioninistrasse 15, 81377 Munich, Germany (H.J.M., H.K., O.D., M.F.R., S.O.S.); Department of Cardiovascular Radiology, UCLA, Los Angeles, Calif (K.N.); and Bracco-Altana Pharma, Konstanz, Germany (K.P.L.). From the 2006 RSNA Annual Meeting. Received September 24, 2006; revision requested December 5; revision received January 9, 2007; accepted February 20; final version accepted April 9. Address correspondence to H.J.M. (e-mail: henrik.michaely{at}med.uni-muenchen.de).

Purpose: To prospectively compare three-dimensional (3D) contrast material–enhanced abdominal magnetic resonance (MR) angiography at 1.5 and 3.0 T intraindividually in healthy volunteers.

Materials and Methods: After institutional review board approval and informed consent were obtained, 15 healthy male volunteers (age range, 24–41 years) underwent one abdominal 3D contrast-enhanced MR angiographic examination each at 1.5 and 3.0 T in random order. Fast 3D gradient-echo sequence with parallel imaging acceleration factor of three was used for MR angiography; acquired spatial resolutions were 1 x 0.8 x 1 mm3 (imaging time, 19 seconds) at 1.5 T and 0.9 x 0.8 x 0.9 mm3 (imaging time, 18 seconds) at 3.0 T. With the latter, volume of the 3D slab was 8% larger. At 1.5 T, 20-mL bolus of gadobenate dimeglumine was delivered at 2 mL/sec; at 3.0 T, 15-mL bolus was delivered at 2.5 mL/sec. Two blinded radiologists rated image quality of aorta and proximal renal arteries in consensus with five-point scale (4 = very good, 0 = nondiagnostic) according to sequence and in direct intraindividual comparison. Visibility of proximal and segmental renal arteries was rated with three-point scale (3 = completely visible, 1 = nonvisible). Signal-to-noise ratio (SNR) was determined with phantoms. For statistical analysis of the SNRs, t tests were used.

Results: All MR angiographic measurements were diagnostic. Median score for image quality at both field strengths was 4. Depiction of proximal renal arteries was rated 3 at both field strengths. The visibility of the distal renal arteries was better at 3.0 T (median score, 3) than at 1.5 T (median score, 2). With direct comparison, 3.0-T MR angiography was better in 14 of 15 cases; no field strength was preferred in the other case. Mean SNR was significantly (P < .001) higher at 3.0 T (17.8 ± 0.09 [standard deviation]) than at 1.5 T (11.9 ± 0.10).

Conclusion: MR angiography at 3.0 T provided better vessel visibility and SNR than did that at 1.5 T, although voxel size and imaging time were reduced.

© RSNA, 2007




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