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This article is part of the supplement: Abstracts of the 15th Annual SCMR Scientific Sessions: 2012

Open Access Workshop presentation

Mitral valve annular velocity measurements derived from cine MRI: validation against Doppler echocardiography

Christoph Guetter1*, Paaladinesh Thavendiranathan23, Marie-Pierre Jolly1, Xiaoguang Lu1, Hui Xue1 and Orlando P Simonetti2

  • * Corresponding author: Christoph Guetter

Author Affiliations

1 Siemens Corporation, Corporate Research, Princeton, NJ, USA

2 Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA

3 Cleveland Clinic Foundation, Cleveland, OH, USA

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Journal of Cardiovascular Magnetic Resonance 2012, 14(Suppl 1):W19  doi:10.1186/1532-429X-14-S1-W19

The electronic version of this article is the complete one and can be found online at: http://www.jcmr-online.com/content/14/S1/W19


Published:1 February 2012

© 2012 Guetter et al; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Summary

Assessment of mitral annular tissue velocity plays an essential role in the evaluation of diastolic dysfunction. We have previously shown that mitral annular velocities can be derived from standard four-chamber cine SSFP images by automatically detecting and tracking the mitral valve insertion points [1]. However, this method has not been validated against tissue Doppler echocardiography, the standard clinical method for evaluating diastolic function.

The objective of this study was to assess the accuracy of early and late diastolic (e’ and a’) mitral annular velocities derived from high temporal resolution SSFP cine by correlating with tissue Doppler echocardiography.

Background

Assessment of mitral annular tissue velocity plays an essential role in the evaluation of diastolic dysfunction. We have previously shown that mitral annular velocities can be derived from standard four-chamber cine SSFP images by automatically detecting and tracking the mitral valve insertion points[1]. However, this method has not been validated against tissue Doppler echocardiography, the standard clinical method for evaluating diastolic function. The objective of this study was to assess the accuracy of early and late diastolic (e’ and a’) mitral annular velocities derived from high temporal resolution SSFP cine by correlating with tissue Doppler echocardiography.

Methods

Nine healthy volunteers (5 males, mean age 26.7 yrs) gave informed consent to undergo CMR and echocardiography exams on the same day. Retrospectively and prospectively gated cine SSFP images in the four-chamber view were acquired during breath-hold on a 3T system (Siemens, Tim Trio). Rate 3 acceleration was used to achieve the following parameters: 17 ms true temporal resolution, 2.0x2.6mmx8mm voxel size, 12-heartbeat duration. Mitral inflow peak velocity (E) was measured using retro-gated segmented PC: TR/TE = 4.5/1.9ms, 10mm slice, 100 x 192 matrix, TSENSE rate=3, VENC=150cm/s, true temporal resolution 36ms. Trans-thoracic tissue Doppler echocardiography was used to measure mitral annular tissue velocities and inflow velocity for 3 heart beats and averaged.

Apex-to-base velocities of the medial and lateral MV insertion points were estimated from cine SSFP images by automatic detection[2] and tracking of position over the entire cardiac cycle using deformable registration[3] as shown in Figure 1. Manual corrections were applied in half of the cases where automated tracking was sub-optimal.

thumbnailFigure 1. Mitral valve annulus velocity tracking in prospectively triggered MR (a), (b), mitral inflow velocity (c), and tissue velocities (d) from Doppler echocardiography. Mean lateral e’ velocities are 11.6 cm/s (echo) and 11.9 cm/s (CMR), and mean lateral a’ velocities are 5.8 cm/s (echo) and 4.9 cm/s (CMR).

Results

There was good agreement between echo and CMR mean e’ and a’ velocities and E/e’ ratios (Table 1). Concordance correlation analysis of combined lateral and medial wall measurements revealed substantial concordance between echo and prospectively triggered (0.64) and retro-gated (0.61) e’ measurements as well as between echo and prospectively triggered (0.65) E/e’ measurements. As expected, retrospectively triggered and retro-gated measurements show strong concordance ranging from 0.81 to 0.91. Although concordance in a’ velocities was poor, the utility of this parameter in clinical practice is not clear.

Conclusions

Despite the small sample size there was substantial concordance between CMR and echo measurement of e’. This suggests that mitral annular velocity can be measured accurately and extracted in an automated fashion from high temporal resolution cine MR acquired in a reasonable breath-hold time. This method combined with mitral inflow velocities offers the potential for CMR to provide important information regarding diastolic function and filling pressures.

Funding

NIH grant RO1 HL 102450;

References

  1. Weale, Guetter et al.. JCMR. 2011.

  2. Lu, Georgescu et al.. MICCAI. 2010.

  3. Guetter, Chefd’Hotel et al.. ISBI. 2011.