Measurement accuracy of different active tracking sequences for interventional MRI. Issue 2 (31st October 2013)

• Record Type: Journal Article
• Authors: Wech, Tobias; Shea, Steven M.; Barbot, Julien; Vij, Kamal; Pan, Li; Lorenz, Christine H.; Patil, Sunil
• Is Part Of: Journal of magnetic resonance imaging. Volume 40:Issue 2(2014)
• Page Start: 490
• Page End: 495
• Publication Date: 2013-10-31
• Subjects: Magnetic resonance imaging -- Periodicals; 616
• DOI: 10.1002/jmri.24374
• Languages: English
• ISSNs: 1053-1807

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="jmri24374-sec-0001" sec-type="section"> <title>Purpose</title> <p>To compare the spatial accuracy of three typical active tracking sequences using a new, unique phantom design.</p> </sec> <sec id="jmri24374-sec-0002" sec-type="section"> <title>Materials and Methods</title> <p>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.</p> </sec> <sec id="jmri24374-sec-0003" sec-type="section"> <title>Results</title> <p>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.</p> </sec> <sec id="jmri24374-sec-0004" sec-type="section"> <title>Conclusion</title> <p>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. <bold>J. Magn. Reson. Imaging 2014;40:490–495</bold>. © <bold>2013 Wiley Periodicals, Inc</bold>.</p> </sec> </abstract>