title: Focused ultrasound transducer for thermal treatment.
abstract: Air-backed transducers have been employed for thermal ultrasonic treatment including both ablation and hyperthermia because the power efficiency rather than the bandwidth is a main concern, unlike a typical imaging transducer working in a pulse mode. The characteristic of an air-backed piezoelectric transducer with a matching layer is analysed, and the role and choice of the matching layer is discussed. An element size of a focused array transducer, appropriate for such thermal treatment, is then estimated, and the characteristic of a piezoceramic transducer element of such a size was numerically analysed using a finite element code. The characteristic of a piezocomposite transducer element is also numerically analysed and its suitability to such a therapeutic array transducer is discussed.
authors.affiliation: Graduate School of Biomedical Engineering, Tohoku University , Sendai , Japan.
authors.forename: Shin-ichiro
authors.initials: S
authors.lastname: Umemura
mesh_terms: D057086:High-Intensity Focused Ultrasound Ablation / Q000379:methods*; D006801:Humans; D006979:Hyperthermia, Induced / Q000379:methods*; D014159:Transducers
keywords: Air-backed transducer; focused array transducer; matching layer; ultrasound