DRCMR eprints
E-print repository for the Danish Research Centre for Magnetic Resonance
This archive contains selected articles and texts, mostly from the DRCMR publication list

Encoding of electrophysiology and other signals in MR images.

Hanson, Lars G and Lund, Torben E and Hanson, Christian G (2007) Encoding of electrophysiology and other signals in MR images. Journal of Magnetic Resonance Imaging : JMRI, 25 (5). pp. 1059-66. ISSN 1053-1807

PDF - Accepted Version

Official URL: http://dx.doi.org/10.1002/jmri.20906


PURPOSE: To develop a gradient insensitive, generic technique for recording of non-MR signals by use of surplus scanner bandwidth. MATERIALS AND METHODS: Relatively simple battery driven hardware is used to transform one or more signals into radio waves detectable by the MR scanner. Similar to the "magstripe" technique used for encoding of soundtracks in motion pictures, the electrical signals are in this way encoded as artifacts appearing in the MR images or spectra outside the region of interest. The encoded signals are subsequently reconstructed from the signal recorded by the scanner. RESULTS: Electrophysiological (EP) eye and heart muscular recording (electrooculography [EOG] and electrocardiography [ECG]) during fast echo planar imaging (EPI) is demonstrated with an expandable, modular 8-channel prototype implementation. The gradient artifacts that would normally be dominating EOG are largely eliminated. CONCLUSION: The method provides relatively inexpensive sampling with inherent microsecond synchronization and it reduces gradient artifacts in physiological recordings significantly. When oversampling is employed, the method is compatible with all MR reconstruction and postprocessing techniques.

Item Type:Article
Subjects:Diagnosis > Diagnostic Techniques and Procedures > Diagnostic Techniques, Neurological > Electroencephalography
Diagnosis > Diagnostic Techniques and Procedures > Diagnostic Imaging > Magnetic Resonance Imaging > Echo-Planar Imaging
Investigative Techniques > Artifacts
Divisions:Copenhagen University Hospital Hvidovre > Danish Research Centre for Magnetic Resonance
ID Code:18
Deposited By:Lars G. Hanson
Deposited On:28 Jun 2008 22:46
Last Modified:02 Apr 2010 02:05

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