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Identification and classification the coronary artery plaque with MRI coronary wall imaging - A Comparative Study Using 64-MDCT

  • Yi He1,
  • Zhaoqi Zhang1,
  • Qinyi Dai1,
  • Wei Yu1,
  • Biao Lu1,
  • Zhanming Fan1,
  • Jing An2,
  • Lixin Jin3,
  • Renate Jerecic4,
  • Guobin Li2,
  • Wolfgang Rehwald5,
  • Meng Li1 and
  • Ning Li1
Journal of Cardiovascular Magnetic Resonance201012(Suppl 1):P44

https://doi.org/10.1186/1532-429X-12-S1-P44

Published: 21 January 2010

Keywords

Coronary PlaquePlaque BurdenCalcify PlaqueCoronary Artery PlaqueMaximal Wall Thickness

Background

Several studies indicated(1) that high-resolution black blood coronary arterial wall MRI has the potential to assess coronary artery wall thickness, non-invasively and measure plaque burden. But a systematical evaluation of coronary plaque components and morphology by MRI has not been done so far.

Purpose

To evaluate the ability of black-blood coronary arterial wall MRI to identify and classify coronary artery plaque, using 64-MDCT as reference standard.

Methods

13 patients(mean age 56.2 ± 11.8 years, 9 men) with confirmed coronary artery disease by coronary CTA (64-MDCT) underwent black-blood coronary wall MRI within 10 days. All scans were performed on a 1.5 T scanner (MAGNETOM Sonata, Siemens, Germany). Cross-sectional coronary wall imaging was acquired using a 2D double-inversion-recovery, ECG-triggered, navigator-gated, fat-suppressed, Turbo-Spin-Echo sequence (TSE) sequence [2] on the lesion coronary artery from the ostium to the middle segment continuously without gap. The vessel cross-sectional area (CSA), luminal CSA, maximal wall thickness, plaque burden, CNR (SI vessel wall - SI perivascular area/SD noise) and SNR (SI vessel wall/SD noise) were measured in each slice which were then compared with the CTA images. CTA were divided into 5-mm segments to compared side by side with MRI.

Results

11 coronary arteries, 62 slices from 10 patients were imaged and analyzed by both MRI and contrast-enhanced 64-MDCT. 3 patients were ruled out (2 due to poor MR image quality, one due to claustrophobia). 39/62 slices were found plaques on both CTA and MRI; those 39 plaques were classified as 3 groups: 10 were calcified plaques, 19 were soft plaques and 10 were mixed plaques by CTA. In MRI, the plaque burden, maximal wall thickness, SNR, CNR in the coronary wall containing plaque were greater compared to the normal coronary wall (0.82 ± 0.08 vs 0.74 ± 0.08, 1.90 ± 0.91 vs 1.54 ± 0.26 mm, 13.10 ± 2.80 vs 10.08 ± 2.46, 6.81 ± 2.52 vs 3.82 ± 1.63 respectively, p < 0.05). The luminal CSA was smaller compared to normal coronary wall (2.56 ± 1.59 mm2 vs 4.48 ± 2.35 mm2, p < 0.05). The SNR in soft plaque was significantly higher than in calcified plaque and mixed plaque (p < 0.05). There was no significant difference in CNR of different plaque types Figure 1.
Figure 1

Figure 1

Conclusion

Coronary wall MRI can identify coronary plaque in proximal segments, and also has the potential to differentiate different types of plaques.

Authors’ Affiliations

(1)
Anzhen Hospital, Capital Medical University, Beijing, PR China
(2)
Siemens Mindit Magnetic Resonance Ltd, Shenzhen, PR China
(3)
collaboration team Siemens Ltd, shang hai, PR China
(4)
Siemens Ltd, Healthcare - Magnetic Resonance, shang hai, PR China
(5)
Siemens Healthcare USA, Chicago, USA

References

  1. Miao C et al: JACC. 2009, 53: 1708-1715.PubMed CentralView ArticlePubMedGoogle Scholar
  2. Shea S et al: Proc ISMRM. 2007, 15: 2475-Google Scholar

Copyright

© He et al; licensee BioMed Central Ltd. 2010

This article is published under license to BioMed Central Ltd.

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