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Titolo:
PENETRATION OF THE HOLMIUM-YAG LASER THROUGH FLUID
Autore:
BLOMLEY MJK; NICHOLSON DA; BARTAL G; BRADLEY A; MYERS M; ALLISON DJ;
Indirizzi:
HAMMERSMITH HOSP,DEPT DIAGNOST RADIOL,DU CANE RD LONDON W12 ENGLAND HAMMERSMITH HOSP,DEPT MED PHYS LONDON W12 ENGLAND ROYAL POSTGRAD MED SCH LONDON W12 ENGLAND
Titolo Testata:
Journal of vascular and interventional radiology
fascicolo: 6, volume: 6, anno: 1995,
pagine: 903 - 910
SICI:
1051-0443(1995)6:6<903:POTHLT>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
VASCULAR TISSUE; ABLATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
M.J.K. Blomley et al., "PENETRATION OF THE HOLMIUM-YAG LASER THROUGH FLUID", Journal of vascular and interventional radiology, 6(6), 1995, pp. 903-910

Abstract

PURPOSE: The 2.1-mu m pulsed holmium:yttrium-aluminum-garnet (Ho:YAG)laser combines the properties of transmissibility down a flexible silica fiber, enabling percutaneous or endoscopic use, with high water absorption, suggesting good safety characteristics. Laser attenuation inpractice, however, is an extremely complex process, The authors studied its effective penetration through blood, bile, urine, saline, and contrast media. MATERIALS AND METHODS: With use of a fiberoptically directed beam and a laser power meter, penetration was measured in vitro with the fiber tip separated from the medium by 5 cm (noncontact mode)and with the fiber tip immersed (contact mode), Logarithm of energy falloff was measured against fluid thickness. Attenuation coefficients (mu) and half value layer (HVL) distances (estimated thickness of fluid needed to halve power) were measured. RESULTS: In noncontact mode, power falloff was exponential, Non-sanguinous media had similar values for mu and HVL (mu = 2.24-2.70 mm(-1) and HVL = 0.26-0.31 mm) close totheoretical predictions. Blood caused significantly (P <.05) more attenuation (mu = 5.15 mm(-1), HVL = 0.13 mm). In contact mode, attenuation was much more complex with ''plateau'' distances of up to 1.2 mm, below which attenuation was negligible. The HVL distances ranged from 0.9 to 1.8 mm and were up to 14 times higher, The main reason is probably the formation of microcavities around the fiber tip. CONCLUSION: The effective penetration of this laser when immersed may be several times that predicted, with important clinical implications.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 10:10:17