Monitoring of laser ablation of biotissues on backscattered radiation

Author

Dmitriev, A.K. ; Kortunov, V.N. ; Konovalov, A.N. ; Yanov, V. A Ul

Author_Institution

Inst. on Laser & Inf. Technol., Russian Acad. of Sci., Moscow

Volume

2

fYear

2003

fDate

16-20 Sept. 2003

Abstract

The monitoring system for laser vaporization of biotissues based on autodyne detection method of backscattered radiation with the help of high-frequency pumping CO₂ laser was developed. It was shown that this method gives the possibility to determine the instant of laser beam passage through tissue layers boundary in real-time. The magnitudes of integrated intensity of power spectrum (UPS) and weighted mean frequency of Doppler signal spectrum (v) were used for the characterization of Doppler signal in time of laser pulse. As an example the dependencies of IIPS(t) and v(t) for different sets of tissue layers are presented. The stick-slip change of these magnitudes near tissue layers boundary is the base of feed-back for irradiation stopping and change of laser radiation parameters

Keywords

backscatter; biological tissues; carbon compounds; gas lasers; heterodyne detection; high-speed optical techniques; laser ablation; laser applications in medicine; optical pumping; CO₂; Doppler signal spectrum; autodyne detection method; backscattered radiation; biotissue layers boundary; high-frequency pumping CO₂ laser; laser ablation monitoring; laser beam passage; laser vaporization; power spectrum; Frequency; Gas detectors; Laser ablation; Laser beams; Laser excitation; Power lasers; Pump lasers; Radiation detectors; Radiation monitoring; Uninterruptible power systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Advanced Optoelectronics and Lasers, 2003. Proceedings of CAOL 2003. First International Conference on

Conference_Location

Alushta, Crimea

Print_ISBN

0-7803-7948-9

Type

conf

DOI

10.1109/CAOL.2003.1251240

Filename

1251240