Towards Reliable Calibrated Transducers for MR-Guided Focused Ultrasound

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

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.