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Eddy current compensation for delta relaxation enhanced MR by dynamic reference phase modulation

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Abstract

Object

Eddy current compensation by dynamic reference phase modulation (eDREAM) is a compensation method for eddy current fields induced by B 0 field-cycling which occur in delta relaxation enhanced MR (dreMR) imaging. The presented method is based on a dynamic frequency adjustment and prevents eddy current related artifacts. It is easy to implement and can be completely realized in software for any imaging sequence.

Materials and methods

In this paper, the theory of eDREAM is derived and two applications are demonstrated. The theory describes how to model the behavior of the eddy currents and how to implement the compensation. Phantom and in vivo measurements are carried out and demonstrate the benefits of eDREAM.

Results

A comparison of images acquired with and without eDREAM shows a significant improvement in dreMR image quality. Images without eDREAM suffer from severe artifacts and do not allow proper interpretation while images with eDREAM are artifact free. In vivo experiments demonstrate that dreMR imaging without eDREAM is not feasible as artifacts completely change the image contrast.

Conclusion

eDREAM is a flexible eddy current compensation for dreMR. It is capable of completely removing the influence of eddy currents such that the dreMR images do not suffer from artifacts.

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Acknowledgments

This work was performed with support from the Federal Ministry of Education and Research under Award No 01EZ0816, Siemens Healthcare Sector Erlangen and the Bavarian Ministry of Economic Affairs, Infrastructure, Transport and Technology. We thank Philipp Kagerbauer, Sabine Voll and Stephanie Weibel for their support with the in vivo measurements.

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Authors and Affiliations

  1. Research Center for Magnetic Resonance Bavaria (MRB), Würzburg, Germany

    Uvo Christoph Hoelscher & Peter M. Jakob

  2. Department of Experimental Physics 5, University of Würzburg, Würzburg, Germany

    Peter M. Jakob

Authors
  1. Uvo Christoph Hoelscher
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  2. Peter M. Jakob
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Correspondence to Uvo Christoph Hoelscher.

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Hoelscher, U.C., Jakob, P.M. Eddy current compensation for delta relaxation enhanced MR by dynamic reference phase modulation. Magn Reson Mater Phy 26, 249–259 (2013). https://doi.org/10.1007/s10334-012-0335-6

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  • DOI: https://doi.org/10.1007/s10334-012-0335-6

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