OBJECTIVE. The purpose of this study was to compare gadobenate dimeglumine–enhanced
MR angiography and unenhanced time-of-flight MR angiography for the detection of significant peripheral
arterial occlusive disease using digital subtraction angiography as our reference standard.
SUBJECTS AND METHODS. Two hundred seventy-two patients underwent MR angiography
and digital subtraction angiography of the iliofemoral arteries. MR angiography was
performed before (2D time-of-flight acquisitions) and after (spoiled gradient-echo acquisitions)
the administration of 0.1 mmol/kg of gadobenate dimeglumine at 1–2 mL/s. Contrast-enhanced
MR angiography and digital subtraction angiography of the calf arteries were performed in 241
of 272 participants. Images were evaluated on-site and by four blinded reviewers (three for MR
angiography, one for digital subtraction angiography). Comparative diagnostic performance for
the detection of significant (≥ 51% vessel lumen narrowing) disease was evaluated using the
McNemar test and generalized estimating equations. Interobserver agreement was assessed with
generalized kappa statistics. The chi-square test was used to compare technical failure rates.
RESULTS. Digital subtraction angiography confirmed significant disease (597 stenoses,
386 occlusions) in 983 iliofemoral segments. The sensitivity (54–80.9%), specificity
(89.7–95.3%), and accuracy (85–87.5%) of contrast-enhanced MR angiography for the detection
of significant iliofemoral disease were significantly (p < 0.001, all reviewers) better than
those of time-of-flight MR angiography (33.2–62.8%, 74.3–88.9%, and 68–77.3%, respectively).
Similar diagnostic performance was obtained for the calf arteries. The technical failure
rate with contrast-enhanced MR angiography (2.5–3.4%) was similar to that of digital subtraction
angiography (1.4%) and significantly (p < 0.001) lower than that of time-of-flight MR angiography
(6.2–18.0%). Significantly better reproducibility (p < 0.001) was obtained with contrast-
enhanced MR angiography (82% vs 65.2% agreement; κ = 0.66 vs 0.45).
CONCLUSION. Improved diagnostic performance and reproducibility are achievable with gadobenate
dimeglumine–enhanced MR angiography in patients with peripheral arterial occlusive disease.
