Detecting laser induced thermal activity in tissue - a Doppler ultrasound approach

Hao Ying, Aamer Azeemi, Craig J. Hartley, Massoud Motamedi, Sohi Rastegar, Louis C. Sheppard

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

There is a growing need for a real-time noninvasive technique to determine the extent and geometry of treated tissue during thermal therapy. We have developed an analog-digital hybrid system which measures the phase and amplitude of the ultrasonic echoes returned from a heated tissue at multiple depths. Two distinct types of echo modulations were observed in our in-vitro studies using beef muscle irradiated with an 810 nm diode laser. Type 1 modulation showed small and slow variations in amplitude and phase, whereas type 2 modulation demonstrated much larger and faster variations in both amplitude and phase. Our study suggests that type 1 modulation is consistent with tissue coagulation, whereas type 2 modulation is associated with tissue evaporation and explosive events.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE Ultrasonics Symposium
PublisherIEEE
Pages1589-1592
Number of pages4
Volume2
StatePublished - 1995
Externally publishedYes
EventProceedings of the 1995 IEEE Ultrasonics Symposium. Part 1 (of 2) - Seattle, WA, USA
Duration: Nov 7 1995Nov 10 1995

Other

OtherProceedings of the 1995 IEEE Ultrasonics Symposium. Part 1 (of 2)
CitySeattle, WA, USA
Period11/7/9511/10/95

Fingerprint

Ultrasonics
Modulation
Tissue
Lasers
Beef
Coagulation
Hybrid systems
Muscle
Semiconductor lasers
Evaporation
Hot Temperature
Geometry

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Ying, H., Azeemi, A., Hartley, C. J., Motamedi, M., Rastegar, S., & Sheppard, L. C. (1995). Detecting laser induced thermal activity in tissue - a Doppler ultrasound approach. In Proceedings of the IEEE Ultrasonics Symposium (Vol. 2, pp. 1589-1592). IEEE.

Detecting laser induced thermal activity in tissue - a Doppler ultrasound approach. / Ying, Hao; Azeemi, Aamer; Hartley, Craig J.; Motamedi, Massoud; Rastegar, Sohi; Sheppard, Louis C.

Proceedings of the IEEE Ultrasonics Symposium. Vol. 2 IEEE, 1995. p. 1589-1592.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ying, H, Azeemi, A, Hartley, CJ, Motamedi, M, Rastegar, S & Sheppard, LC 1995, Detecting laser induced thermal activity in tissue - a Doppler ultrasound approach. in Proceedings of the IEEE Ultrasonics Symposium. vol. 2, IEEE, pp. 1589-1592, Proceedings of the 1995 IEEE Ultrasonics Symposium. Part 1 (of 2), Seattle, WA, USA, 11/7/95.
Ying H, Azeemi A, Hartley CJ, Motamedi M, Rastegar S, Sheppard LC. Detecting laser induced thermal activity in tissue - a Doppler ultrasound approach. In Proceedings of the IEEE Ultrasonics Symposium. Vol. 2. IEEE. 1995. p. 1589-1592
Ying, Hao ; Azeemi, Aamer ; Hartley, Craig J. ; Motamedi, Massoud ; Rastegar, Sohi ; Sheppard, Louis C. / Detecting laser induced thermal activity in tissue - a Doppler ultrasound approach. Proceedings of the IEEE Ultrasonics Symposium. Vol. 2 IEEE, 1995. pp. 1589-1592
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