Development of standard measurement methods for essential properties of ultrasound therapy equipment
This report summarises studies undertaken by the Centre for Medical Technology (TNO), the National Physical Laboratory (NPL) and the Physikalisch Technische Bundesanstalt (PTB) to develop reliable methods of measurement for characterising the output and performance of ultrasound therapy equipment. The experimental investigations concentrated on the number of samples required in a raster scan and the hydrophone size and type, which may finally affect the determination of the ERA (Effective Radiating Area) and the BNR (Beam Nonuniformity Ratio). In total 48 treatment heads of 27 different types have been investigated. The BCSA (Beam Cross-Sectional Area), including the effect of a hot-spot, and the ERA have been evaluated for different types of receivers and frequency-diameter products of the source. As a result of the work new definitions have been established for the BCSA and the ERA.
Bibliographic Reference: EUR 14761 EN (1993) 40 pp., MF, ECU 4
Record Number: 199311655 / Last updated on: 1994-11-28
Original language: en
Available languages: en