A dual use ultrasonic transceiver device for thermal tissue damage, comprising:a first piezoelectric transceiver sized for placement in a body lumen；a power unit which provides power to said transducer suitable for generating an ultrasonic power beam for thermal tissue damage in a tissue damage region； anda sensing unit which receives ultrasonic signals for sensing at said tissue damage regionwherein said first piezoelectric transceiver is mounted on a mounting and wherein said mounting comprising mechanical damping for said piezoelectric surface, the mounting being configured such as to provide a first region of said piezoelectric surface with a first relatively high level of mechanical damping and a second region of said piezoelectric surface with a second relatively low level of mechanical damping, said damping levels being selected to enable said ultrasonic sensing from said first region and said power transmission from said second region.
