Acoustic power measurement of high intensity focused ultrasound in medicine based on radiation force

Ultrasonics ◽  
2006 ◽  
Vol 44 ◽  
pp. e17-e20 ◽  
Author(s):  
Wende Shou ◽  
Xiaowei Huang ◽  
Shimei Duan ◽  
Rongmin Xia ◽  
Zhonglong Shi ◽  
...  
Keyword(s):  
High Intensity ◽  
Focused Ultrasound ◽  
Radiation Force ◽  
Acoustic Power ◽  
High Intensity Focused Ultrasound ◽  
Power Measurement

High Intensity Focused Ultrasound (HIFU) Transducer Characterization Using Acoustic Streaming

2007 ◽  
Author(s):  
Prasanna Hariharan ◽  
Ronald A. Robinson ◽  
Matthew R. Myers ◽  
Rupak K. Banerjee
Keyword(s):  
High Intensity ◽  
Focused Ultrasound ◽  
Optical Measurement ◽  
Measurement Techniques ◽  
Acoustic Streaming ◽  
Acoustic Power ◽  
High Intensity Focused Ultrasound ◽  
Medical Ultrasound ◽  
Intensity Field ◽  
Streaming Velocity

A new, non-perturbing optical measurement technique was developed to characterize medical ultrasound fields generated by High Intensity Focused Ultrasound (HIFU) transducers using a phenomenon called ‘acoustic streaming’. The acoustic streaming velocity generated by HIFU transducers was measured experimentally using Digital Particle Image Velocimetry (DPIV). The streaming velocity was then calculated numerically using the finite-element method. An optimization algorithm was developed to back-calculate acoustic power and intensity field by minimizing the difference between experimental and numerical streaming velocities. The intensity field and acoustic power calculated using this approach was validated with standard measurement techniques. Results showed that the inverse method was able to predict acoustic power and intensity fields within 10% of the actual value measured using standard techniques, at the low powers where standard methods can be safely applied. This technique is also potentially useful for evaluating medical ultrasound transducers at the higher power levels used in clinical practice.

Radiation force on absorbing targets and power measurements of a high intensity focused ultrasound (HIFU) source

2010 ◽  
Vol 53 (10) ◽  
pp. 1780-1787 ◽  
Author(s):  
ZuWen Qian ◽  
ZheMin Zhu ◽  
ShiGong Ye ◽  
WenHua Jiang ◽  
HouQing Zhu ◽  
...  
Keyword(s):  
High Intensity ◽  
Focused Ultrasound ◽  
Radiation Force ◽  
High Intensity Focused Ultrasound ◽  
Power Measurements

scholarly journals Estimation of Acoustic Power Output from Electrical Impedance Measurements

Acoustics ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 37-50
Author(s):  
Gergely Csány ◽  
Michael Gray ◽  
Miklós Gyöngy
Keyword(s):  
Power Output ◽  
High Intensity ◽  
Electrical Impedance ◽  
Focused Ultrasound ◽  
Low Cost ◽  
Acoustic Power ◽  
High Intensity Focused Ultrasound ◽  
Ultrasound Transducers ◽  
Impedance Measurements ◽  
Primary Advantage

A method is proposed for estimating the acoustic power output of ultrasound transducers using a two-port model with electrical impedance measurements made in three different propagation media. When evaluated for two high-intensity focused ultrasound transducers at centre frequencies between 0.50 and 3.19 MHz, the resulting power estimates exceeded acoustic estimates by 4.5–21.8%. The method was shown to be valid for drive levels producing up to 20 MPa in water and should therefore be appropriate for many HIFU (high-intensity focused ultrasound) applications, with the primary advantage of employing relatively low-cost, non-specialist materials and instrumentation.

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