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Abstract #1241

Radiation Damping at Clinical Field Strengths: How to Analyse and Avoid it to enable quantitative MRI with Dedicated Coils

Niklas Wallstein1, Roland Müller1, André Pampel1, and Harald E Möller1,2
1NMR group, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany, 2Department of Physics, Leipzig University, Leipzig, Germany

Synopsis

Keywords: System Imperfections: Measurement & Correction, Ex-Vivo Applications, Radiation Damping

Radiation damping (RD) is, in principial, well understood but commonly unconsidered in MRI. It results from inductive coupling of the spin system and the detection circuit, leading to nonlinearities in the Bloch equations. Previous research established that RD increases with the filling factor and quality factor of the coil and the magnetic field strength. However, little attention has been paid to a quantitative characterization. Moreover, implications for the RF pulse performance must be considered given similar timescales (milliseconds) of RD and pulse length. Our findings indicate that RD can impact typical MRI sequences and, consequently, parameters determined from their application.

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Keywords