title: A radiation emission shielding method for high intensity focus ultrasound probes.
abstract: Electromagnetic compatibility (EMC) is a key issue in the design and development of safe and effective medical instruments. The treatment probes of high intensity focused ultrasound (HIFU) systems not only receive and transmit electromagnetic waves, but also radiate ultrasound waves, resulting in electromagnetic coupling. In this paper, an electromagnetic shielding method involving the enclosure of the probe in a copper wire mesh was introduced. First, sound pressure distribution simulations and measurements were performed using a hydrophone in order to evaluate the effects of the wire mesh on the acoustic performance of the HIFU system. The results indicated that the wire mesh did not disturb the normalized sound pressure field. In addition, the attenuation of the maximum pressure in the focal plane was equal to 6.2%. Then, the electronic emission level was tested in a chamber. After the implementation of the wire mesh, the 10-100 MHz frequency band radiation was suppressed, and the HIFU system satisfied the national EMC standards.
authors.affiliation: Biomedical Instrument Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P.R. China.|Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, 200030, P.R. China.
authors.forename: Hao
authors.initials: H
authors.lastname: Wu
authors.affiliation: Biomedical Instrument Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P.R. China.|Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, 200030, P.R. China.
authors.forename: Guofeng
authors.initials: G
authors.lastname: Shen
authors.affiliation: Biomedical Instrument Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P.R. China.|Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, 200030, P.R. China.
authors.forename: Yazhu
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003300:Copper / Q000737:chemistry; D004559:Electric Wiring; D060733:Electromagnetic Radiation; D004867:Equipment Design; D019220:High-Energy Shock Waves / Q000009:adverse effects / Q000627:therapeutic use; D006801:Humans
chemical_list: D003300:Copper
keywords: High intensity focused ultrasound; electromagnetic compatibility; radiated emission; radio frequency shielding