DocumentCode :
832740
Title :
Soft tissue temperature rise caused by scanned, diagnostic ultrasound
Author :
Curley, Michael G.
Author_Institution :
Acuson, Mountain View, CA, USA
Volume :
40
Issue :
1
fYear :
1993
Firstpage :
59
Lastpage :
66
Abstract :
An acoustic-thermal model was developed for scanned diagnostic ultrasound in soft tissue. An adiabatic surface between the transducer and the skin was justified, and the model accounted for attenuation and focusing. The temperature along the central plane of the temporally averaged acoustic field was calculated by integration of line sources of heat that result from the tissue´s absorption of ultrasound. The temperature profiles were calculated for 1400 transducers. The results show that current diagnostic transducers heat more significantly at the transducer-tissue interface than at the focus. The temperature rise in the focal region is typically less than 25% of that at the surface. The acoustic power per scan length that results in a 1 degrees C temperature rise at the surface is calculated as (210 mW-MHz/cm)/f. These results apply to both linear arrays and sectorlike scan formats. The temperature rises for simultaneous multimode scanned beams are additive as the peak temperatures of each mode will occur on the surface. Consideration was given to the surface boundary condition for such models. This boundary is considered adiabatic for calculation of heating due to acoustic absorption alone. Additional heating or cooling resulting from the transducer can then be superimposed on this solution.<>
Keywords :
biological effects of acoustic radiation; biomedical measurement; biomedical ultrasonics; biothermics; patient diagnosis; ultrasonic absorption; absorption of ultrasound; acoustic absorption; acoustic power per scan length; acoustic-thermal model; adiabatic surface; attenuation; averaged acoustic field; focal region; focusing; integration of line sources of heat; linear arrays; scanned diagnostic ultrasound; sectorlike scan formats; simultaneous multimode scanned beams; soft tissue; surface boundary condition; temperature profiles; temperature rise; transducer-tissue interface; Absorption; Acoustic beams; Acoustic transducers; Attenuation; Biological tissues; Heating; Skin; Temperature; Ultrasonic imaging; Ultrasonic transducers;
fLanguage :
English
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-3010
Type :
jour
DOI :
10.1109/58.184999
Filename :
184999
Link To Document :
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