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Diagnostic accuracy of non-contrast quiescent-interval slice-selective (QISS) MRA combined with MRI-based vascular calcification visualization for the assessment of arterial stenosis in patients with lower extremity peripheral artery disease

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Abstract

Objectives

The proton density–weighted, in-phase stack-of-stars (PDIP-SOS) MRI technique provides calcification visualization in peripheral artery disease (PAD). This study sought to investigate the diagnostic accuracy of a combined non-contrast quiescent-interval slice-selective (QISS) MRA and PDIP-SOS MRI protocol for the detection of PAD, in comparison with CTA and digital subtraction angiography (DSA).

Methods

Twenty-six prospectively enrolled PAD patients (70 ± 8 years) underwent lower extremity CTA and 1.5-T or 3-T PDIP-SOS/QISS MRI prior to DSA. Two readers rated image quality and graded stenosis (≥ 50%) on QISS MRA without/with calcification visualization. Sensitivity, specificity, and area under the curve (AUC) were calculated against DSA. Calcification was quantified and compared between MRI and non-contrast CT (NCCT) using paired t test, Pearson’s correlation, and Bland-Altman analysis.

Results

Image quality ratings were significantly higher for CTA compared to those for MRA (4.0 [3.0–4.0] and 3.0 [3.0–4.0]; p = 0.0369). The sensitivity and specificity of QISS MRA, QISS MRA with PDIP-SOS, and CTA for ≥ 50% stenosis detection were 85.4%, 92.2%, and 90.2%, and 90.3%, 93.2%, and 94.2%, respectively, while AUCs were 0.879, 0.928, and 0.923, respectively. A significant increase in AUC was observed when PDIP-SOS was added to the MRA protocol (p = 0.0266). Quantification of calcification showed significant differences between PDIP-SOS and NCCT (80.6 ± 31.2 mm3 vs. 88.0 ± 29.8 mm3; p = 0.0002) with high correlation (r = 0.77, p < 0.0001) and moderate mean of differences (− 7.4 mm3).

Conclusion

QISS MRA combined with PDIP-SOS MRI provides improved, CTA equivalent, accuracy for the detection of PAD, although its image quality remains inferior to CTA.

Key Points

• Agreement in stenosis detection rate using non-contrast quiescent-interval slice-selective MRA compared to DSA improved when calcification visualization was provided to the readers.

• An increase was observed in both sensitivity and specificity for the detection of ≥ 50% stenosis when MRI-based calcification assessment was added to the protocol, resulting in a diagnostic accuracy more comparable to CTA.

• Quantification of calcification showed statistical difference between MRI and non-contrast CT; however, a high correlation was observed between the techniques.

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Abbreviations

ABI:

Ankle brachial index

CI:

Confidence interval

ICC:

Intraclass correlation coefficient

MIP:

Maximum intensity projection

NCCT:

Non-contrast computed tomography

PAD:

Peripheral artery disease

PDIP-SOS:

Proton density–weighted, in-phase stack-of-stars

PETRA:

Point-wise encoding time reduction with radial acquisition

QISS:

Quiescent-interval slice-selective

UTE:

Ultra-short echo time

VNC:

Virtual non-contrast

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Funding

This study was supported by a research grant from Siemens and by NIH NHLBI R01 HL130093 (RRE).

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Correspondence to U. Joseph Schoepf.

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Guarantor

The scientific guarantor of this publication is U. Joseph Schoepf.

Conflict of interest

The authors of this manuscript declare relationships with the following companies: U. Joseph Schoepf is a consultant for and/or receives research support from Astellas, Bayer, Elucid Bioimaging, Guerbet, HeartFlow Inc., and Siemens Healthcare. Akos Varga-Szemes receives institutional research and travel support from Siemens Healthcare and is a consultant for Elucid Bioimaging. Robert R. Edelman receives grant support and royalties from Siemens Healthcare. Ioannis Koktzoglou receives research support from Siemens Healthcare.

Statistics and biometry

One of the authors has significant statistical expertise.

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Written informed consent was obtained from all subjects (patients) in this study.

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Institutional Review Board approval was obtained.

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• prospective

• diagnostic or prognostic study

• performed at one institution

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Varga-Szemes, A., Penmetsa, M., Emrich, T. et al. Diagnostic accuracy of non-contrast quiescent-interval slice-selective (QISS) MRA combined with MRI-based vascular calcification visualization for the assessment of arterial stenosis in patients with lower extremity peripheral artery disease. Eur Radiol 31, 2778–2787 (2021). https://doi.org/10.1007/s00330-020-07386-4

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  • DOI: https://doi.org/10.1007/s00330-020-07386-4

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