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Abstract #3803

Towards Reliable Calibrated Transducers for MR-Guided Focused Ultrasound

Tobias Klepsch1, Julian Haller1, Klaus-Vitold Jenderka1, Werner Hoffmann1, Bernd Ittermann1, Frank Seifert1

1Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Germany

High Intensity Focused Ultrasound (HIFU) guided by MR thermometry is a promising tumor therapy in organs such as liver, uterus and prostate. Although the technique is already clinical routine the calibrated measurement of high intensity ultrasound fields still needs closer examination. We present an approach towards finding a traceable calibration for MR guided focused ultrasound (MRgFUS) using a reference heating element. Furthermore we examined the focal zone of a commercial MR compatible transducer with MR thermometry at 3 tesla. This was done either for a fixed position or during translational movement of the transducer.