Regensburg 2007 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 1: Medizinische Bildgebung I

ST 1.5: Talk

Monday, March 26, 2007, 11:30–11:45, Ch 12.0.16

Significant influence of ultrasound on the Hahn-echo-amplitude in soft matter — •Ole Oehms, Nouri Elmiladi, André Engelbertz, Bernd Habenstein, Carmen Morar, and Karl Maier — Helmholtz-Institut für Strahlen- und Kernphysik, Bonn

Nuclear Magnetic Resonance (NMR) and Ultrasound (US) are both methods that are very commonly used over decades in medical diagnostics for the visualization of the inner parts of the body. Both methods are highly developed and are close to their physical limits. There are only a few efforts in combining US and NMR in soft matter. A new surprising result is that the Hahn echo amplitude can be dramatically changed by applying low-energetic US-pulses. In this talk the experimental setup for this research is presented and the effect of a variation of the US parameters (pulse length, pulse amplitude, pulse position in the sequence, US-frequency) on the echo-amplitude is demonstrated. According to our present knowledge, a viscous momentum transfer in the medium is responsible for the effect. This novel tool can deliver additional contrasts in magnetic resonance imaging.