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Abstract #1826

Feasibility of a new actuator type for magnetic resonance elastography based on transient air pressure impulses

Jrgen Braun 1 , Sebastian Hirsch 2 , Tassilo Heinze 3 , and Ingolf Sack 2

1 Department of Medical Informatics, Charit - Universittsmedizin Berlin, Berlin, Berlin, Germany, 2 Department of Radiology, Charit - Universittsmedizin Berlin, Berlin, Germany, 3 SPL Spindel und Przisionslager GmbH, Sachsen, Germany

A new actuator for MRE is introduced based on transient air pressure waves produced by a fast switching valve and an air-filled cylindrical bellow inside the magnet. This concept provides an economic setup of interference-free, powerful and easy-to-use drivers for potential applications of MRE in obese patients, at low gradient systems and for remote actuation. The feasibility of the new driver is demonstrated by MRE of the brain and remote excitation from the upper thoracic spine. The combination of low drive frequencies and high resolution elasticity reconstruction provided viscoelastic parameter maps in agreement to previous work on cerebral MRE.

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