title: 1.5-D high intensity focused ultrasound array for non-invasive prostate cancer surgery.
abstract: The aim of this study is to demonstrate the feasibility of a new spherically curved 1.5-D phased array for the treatment of localized prostatic cancer. The device is designed to conform to the Ablatherm machine (EDAP-Technomed, France), a commercially available machine in which high intensity focused ultrasound (HIFU) treatment for prostate cancer is administered transrectally. It uses high intensity electronically focused ultrasound to steer a beam along two axes, allowing enough depth to be reached to treat large prostates and eliminating two degrees of mechanical movement. Through computer simulation, it was determined that a curved 1.5-D configuration offered the optimal design. Two configurations were then proposed, and their ability to steer a beam within a target volume centered on the geometric focus of the transducer was simulated. An eight-element prototype was constructed to test the piezo-composite material and its electro-acoustical efficiency. Then, an array was constructed, and a multi-channel amplifier and control system were added, to permit remote operation. Acoustical and electrical measurements were made to verify performance. Finally, the 1.5-D array was tested in vitro on samples of pig liver to confirm the ability to induce lesions.
authors.forename: L
authors.initials: L
authors.lastname: Curiel
authors.forename: F
authors.initials: F
authors.lastname: Chavrier
authors.forename: R
authors.initials: R
authors.lastname: Souchon
authors.forename: A
authors.initials: A
authors.lastname: Birer
authors.forename: J Y
authors.initials: JY
authors.lastname: Chapelon
mesh_terms: D004867:Equipment Design; D006358:Hot Temperature; D006801:Humans; D008297:Male; D011471:Prostatic Neoplasms / Q000601:surgery*; D014159:Transducers; D014464:Ultrasonic Therapy / Q000295:instrumentation*