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Titolo:
COMPARISON OF THE EFFECTS OF ABSORPTION-COEFFICIENT AND PULSE DURATION OF 2.12-MU-M AND 2.79-MU-M RADIATION ON LASER-ABLATION OF TISSUE
Autore:
FRENZ M; PRATISTO H; KONZ F; JANSEN ED; WELCH AJ; WEBER HP;
Indirizzi:
UNIV BERN,INST APPL PHYS,SIDLERSTR 5 CH-3012 BERN SWITZERLAND UNIV TEXAS,BIOMED ENGN PROGRAM AUSTIN TX 78712
Titolo Testata:
IEEE journal of quantum electronics
fascicolo: 12, volume: 32, anno: 1996,
pagine: 2025 - 2036
SICI:
0018-9197(1996)32:12<2025:COTEOA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
MIDINFRARED LASER; YAG LASER; ER-YAG; ERBIUM-LASER; THERMAL-DAMAGE; WATER; HOLMIUM; ANGIOPLASTY; SKIN; GENERATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
61
Recensione:
Indirizzi per estratti:
Citazione:
M. Frenz et al., "COMPARISON OF THE EFFECTS OF ABSORPTION-COEFFICIENT AND PULSE DURATION OF 2.12-MU-M AND 2.79-MU-M RADIATION ON LASER-ABLATION OF TISSUE", IEEE journal of quantum electronics, 32(12), 1996, pp. 2025-2036

Abstract

Erbium and holmium lasers are attractive for minimally invasive surgical applications as they operate at wavelengths where tissues exhibit strong absorption due to their water content and because these wavelengths are transmittable through optical fibers. In this study, the basic physical mechanisms underlying tissue ablation and the laser-inducedtissue effects using pulsed Er:YSGG (2.79 mu m) and Ho:YAG (2.12 mu m) laser radiation are presented and compared. Q-switched (tau = 40 ns,E less than or equal to 50 mJ) and free-running (tau = 250 and 400 mus) Er:YSGG (E = 100 mJ) and Ho:YAG (E less than or equal to 1 J) laser energy was delivered in water via a 400-mu m fiber. The dimension and lifetime of the expanding and collapsing bubbles and the laser-induced pressure in water after each laser pulse were measured with fast-flash videography and time-resolved pressure measurements, Depending on the absorption coefficient, pulse energy, and pulse duration, three different regimes were distinguished: evaporation, tensile-stress-induced cavitation, and explosive vaporization. In vitro tissue effects, ablation depth, and extent of tissue damage on meniscus treated under water and on cornea treated in air were investigated and examined histologically, Er:YSGG radiation, due to its 100 times higher absorption than Ho:YAG radiation, exhibited a high tissue ablation efficiency with arelatively small zone of coagulated tissue (Q-snitched 4-10 mu m, free-running less than 100 mu m), whereas the coagulated tissue zone was 300-1000 mu m after free-running and 100-120 mu m after Q-switched Ho:YAG laser impact.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 07:56:22