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Investigative Radiology:
doi: 10.1097/RLI.0b013e3182539554
Original Articles

Magnetic Resonance Evaluation of Renal Artery Stenosis in a Swine Model: Performance of Low-Dose Gadobutrol Versus Gadoterate Meglumine in Comparison With Digital Subtraction Intra-Arterial Catheter Angiography

Morelli, John N. MD*; Runge, Val M. MD; Ai, Fei MD; Zhang, Wei MD; Li, Xiaoming MD, PhD; Schmitt, Peter PhD§; McNeal, Gary RT, BS; Miller, Matthew DVM; Lennox, Mark PhD; Wusten, Oliver MD#; Schoenberg, Stefan O. MD**; Attenberger, Ulrike I. MD**

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Abstract

Purpose: The aim of this study was to compare low-dose imaging with gadobutrol and gadoterate meglumine (Gd-DOTA) for evaluation of renal artery stenosis with 3-T magnetic resonance angiography (MRA) in a swine model.

Method and Materials: A total of 12 experimental animals were evaluated using equivalently dosed gadobutrol and Gd-DOTA for time-resolved and static imaging. For time-resolved imaging, the time-resolved imaging with stochastic trajectories (TWIST) technique (temporal footprint, 4.4 seconds) was used; a dose of 1 mL of gadobutrol was injected at 2 mL/s and a dose of 2 mL of Gd-DOTA was injected at both 2 and 4 mL/s. For a separate static acquisition, doses were doubled. The static scans were used for stenosis gradation and the time-resolved scans for comparison of enhancement dynamics, signal-to-noise ratio (SNR), and qualitative assessments.

Results: The average magnitude of difference in the stenosis measurements with static gadobutrol scans relative to digital subtraction intra-arterial catheter angiography (mean [SD], 7.4% [5.6%]) was less than with both the 2 mL/s (10.6% [6.2%]) and 4 mL/s (11.5% [7.8%]) Gd-DOTA MRA protocols. On time-resolved scans, peak signal-to-noise ratio was greatest with the gadobutrol protocol (P < 0.05), and the gadobutrol TWIST scan was preferred to the TWIST Gd-DOTA scan in terms of image quality and stenosis visualization in every case for every reader.

Conclusion: Low-dose gadobutrol (∼0.05 mmoL/kg) contrast-enhanced MRA results in improved accuracy of renal artery stenosis assessments relative to equivalently dosed Gd-DOTA at 3 T.

© 2012 Lippincott Williams & Wilkins, Inc.

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