Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5485568 | Ultrasound in Medicine & Biology | 2017 | 14 Pages |
Abstract
Reliable acoustic characterization is fundamental for patient safety and clinical efficacy during high-intensity therapeutic ultrasound (HITU) treatment. Technical challenges, such as measurement variation and signal analysis, still exist for HITU exposimetry using ultrasound hydrophones. In this work, four hydrophones were compared for pressure measurement: a robust needle hydrophone, a small polyvinylidene fluoride capsule hydrophone and two fiberoptic hydrophones. The focal waveform and beam distribution of a single-element HITU transducer (1.05Â MHz and 3.3Â MHz) were evaluated. Complex deconvolution between the hydrophone voltage signal and frequency-dependent complex sensitivity was performed to obtain pressure waveforms. Compressional pressure (p+), rarefactional pressure (pâ) and focal beam distribution were compared up to 10.6/â6.0Â MPa (p+/pâ) (1.05Â MHz) and 20.65/â7.20Â MPa (3.3Â MHz). The effects of spatial averaging, local non-linear distortion, complex deconvolution and hydrophone damage thresholds were investigated. This study showed a variation of no better than 10%-15% among hydrophones during HITU pressure characterization.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Acoustics and Ultrasonics
Authors
Yunbo Liu, Keith A. Wear, Gerald R. Harris,