30 May 2001 Design of an exposimetry system for analysis of high-frequency ultrasound devices
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Abstract
An exposimetry system for characterization of high frequency ultrasound fields has been developed and built. By extrapolating the recommendations of the AIUM and IEC standards to higher frequencies, an exposimetry system operating above 15 MHz was outlined. The system incorporates a five degrees-of-freedom positioning system, including three automated translational motors that provide 0.5 micron resolution. Two manual rotational axes utilize a worm-gear and concentric cylinder arrangement to insure orthogonal rotational adjustment. Overall bandwidth of the system is 100 MHz and is limited by the type of hydrophone used. Using a calibrated 0.04 mm diameter needle-type hydrophone, measurements of single element transducers of 25-50 MHz have been made. LiNbO3 and PVDF transducers of f-numbers from 2-3 have been tested and 2D intensity beam profiles plotted. Results from a 50 MHz LiNbO3 transducer show good agreement between empirical (8.6 mm) and theoretical (9.0 mm) focal points. The -3 dB beamwidth was also measured (108 micron) to be comparable to that of the calculated value (86 micron). It is shown that this system provides a good means for characterization and analysis of the beam profiles of high frequency transducers.
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Kevin A. Snook, Bin Huang, Nadine B. Smith, K. Kirk Shung, "Design of an exposimetry system for analysis of high-frequency ultrasound devices", Proc. SPIE 4325, Medical Imaging 2001: Ultrasonic Imaging and Signal Processing, (30 May 2001); doi: 10.1117/12.428221; https://doi.org/10.1117/12.428221
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