A therapy apparatus has a source of acoustic waves with an X-ray-transparent region. An X-ray-transparent diagnostic ultrasound transducer of an ultrasound locating system is contained in this region. The X-ray-transparent diagnostic ultrasound transducer can be a piezoelectrically...http://www.google.de/patents/US5699804?utm_source=gb-gplus-sharePatent US5699804 - Therapy apparatus having a source of acoustic waves
