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J Magn Reson Imaging. 2014 Aug;40(2):490-5. doi: 10.1002/jmri.24374. Epub 2013 Oct 31.

Measurement accuracy of different active tracking sequences for interventional MRI.

Author information

1
Center for Applied Medical Imaging and Computer Vision, Siemens Corporation, Corporate Technology, Baltimore, Maryland, USA; Institute of Radiology, University of Würzburg, Würzburg, Germany; Comprehensive Heart Failure Center, University of Würzburg, Würzburg, Germany.

Abstract

PURPOSE:

To compare the spatial accuracy of three typical active tracking sequences using a new, unique phantom design.

MATERIALS AND METHODS:

Three different tracking sequences (Single Echo, Dual Echo and Hadamard Multiplexed) were compared with each other in a phantom study with respect to their positional accuracy. A custom-built phantom was constructed to conduct the experiments with precise framework conditions which facilitated sufficient measurement accuracy. An electrophysiology catheter incorporating four micro-coils was used as an interventional device. Tracking profiles were acquired in all three spatial dimensions and validated against the distances that were measured by a Vernier caliper in combination with a three-dimensional reference scan.

RESULTS:

The Bland-Altman plots demonstrated that all three sequences show < 1.5 mm positional error. The measurement accuracy of Single Echo and Double Echo are prone to off-resonances, whereas Hadamard Encoding is immune to it.

CONCLUSION:

The developed phantom enabled the performance of objective measurements of the accuracy of different active tracking sequences. The proposed setup allows for objectively contrasting different methods for interventional procedures.

KEYWORDS:

active tracking; electrophysiological procedures; interventional MRI

PMID:
24677517
DOI:
10.1002/jmri.24374
[Indexed for MEDLINE]
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