Optoacoustic monitoring of freezing and hypothermia of tissue and tissue phantoms

Irina V. Larina; Kirill V. Larin; Massoud Motamedi; Rinat O. Esenaliev

doi:10.1117/12.381528

6 April 2000 Optoacoustic monitoring of freezing and hypothermia of tissue and tissue phantoms

Irina V. Larina, Kirill V. Larin, Massoud Motamedi, Rinat O. Esenaliev

Proceedings Volume 4001, Saratov Fall Meeting '99: Optical Technologies in Biophysics and Medicine; (2000) https://doi.org/10.1117/12.381528
Event: Saratov Fall Meeting '99, 1999, Saratov, Russian Federation

Abstract

Monitoring of tissue freezing and hypothermia during cryotherapy in real time is in the great demand for precise selective destruction of tumors. Ultrasound imaging, magnetic resonance imaging, and computer tomography techniques proposed for cryotherapy monitoring have problems associated with long acquisition time, high cost, low contrast, and poor resolution. In this paper we propose to use optoacoustic technique for monitoring of tissue freezing and hypothermia. Optoacoustic imaging is based on time-resolved detection of laser-induced acoustic waves. We studied influence of cooling and freezing on amplitude and profile of laser induced optoacoustic signals recorded from tissue phantoms (aqueous solution of potassium chromate) and canine liver. We used liquid nitrogen as a coolant of our samples. Q-switched Nd:YAG laser pulses were used to induce optoacoustic pulses. Our studies demonstrated that (1) amplitude of optoacoustic signals recorded from native tissues and aqueous solutions decreases with cooling down to the temperatures of -2 °C and 0 °C, respectively; and (2) freezing of tissues and aqueous solutions results in dramatic change in the optoacoustic signal profiles and amplitude. Our results indicate that the laser optoacoustic technique can potentially be used for real-time monitoring of freezing front in tissue with 0.5-mm spatial resolution.

Citation Download Citation

Irina V. Larina, Kirill V. Larin, Massoud Motamedi, and Rinat O. Esenaliev "Optoacoustic monitoring of freezing and hypothermia of tissue and tissue phantoms", Proc. SPIE 4001, Saratov Fall Meeting '99: Optical Technologies in Biophysics and Medicine, (6 April 2000); https://doi.org/10.1117/12.381528

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available