Combined transesophageal and surface MRI provides optimal imaging in aortic atherosclerosis

Henning Steen, William P. Warren, Milind Desai, Sandeep Gautam, Shanghan Lai, Scott Heath, Matthias Stuber, João A.C. Lima

Research output: Contribution to journalArticle

Abstract

Objective: Surface magnetic resonance imaging (MRI) for aortic plaque assessment is limited by the trade-off between penetration depth and signal-to-noise ratio (SNR). For imaging the deep seated aorta, a combined surface and transesophageal MRI (TEMRI) technique was developed 1) to determine the individual contribution of TEMRI and surface coils to the combined signal, 2) to measure the signal improvement of a combined surface and TEMRI over surface MRI, and 3) to assess for reproducibility of plaque dimension analysis. Methods and Results: In 24 patients six black blood proton-density/T2-weighted fast-spin echo images were obtained using three surface and one TEMRI coil for SNR measurements. Reproducibility of plaque dimensions (combined surface and TEMRI) was measured in 10 patients. TEMRI contributed 68% of the signal in the aortic arch and descending aorta, whereas the overall signal gain using the combined technique was up to 225%. Plaque volume measurements had an intraclass correlation coefficient of as high as 0.97. Conclusion: Plaque volume measurements for the quantification of aortic plaque size are highly reproducible for combined surface and TEMRI. The TEMRI coil contributes considerably to the aortic MR signal. The combined surface and TEMRI approach improves aortic signal significantly as compared to surface coils alone. Condensed Abstract: Conventional MRI aortic plaque visualization is limited by the penetration depth of MRI surface coils and may lead to suboptimal image quality with insufficient reproducibility. By combining a transesophageal MRI (TEMRI) with surface MRI coils we enhanced local and overall image SNR for improved image quality and reproducibility.

Original languageEnglish (US)
Pages (from-to)909-916
Number of pages8
JournalJournal of Cardiovascular Magnetic Resonance
Volume6
Issue number4
DOIs
StatePublished - Dec 1 2004

Keywords

  • Atherosclerosis
  • Plaque volume measurements
  • Reproducibility
  • Thoracic aorta
  • Transesophageal MRI

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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