Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Free electron laser lithotripsy: Threshold radiant exposures
Autore:
Chan, KF; Hammer, DX; Choi, B; Teichman, JMH; McGuff, HS; Pratisto, H; Jansen, ED; Welch, AJ;
Indirizzi:
Univ Texas, Dept Elect & Comp Engn, Austin, TX 78712 USA Univ Texas Austin TX USA 78712 pt Elect & Comp Engn, Austin, TX 78712 USA Univ Texas, Biomed Engn Program, Austin, TX 78712 USA Univ Texas Austin TX USA 78712 Biomed Engn Program, Austin, TX 78712 USA Univ Texas, Hlth Sci Ctr, Div Dent, San Antonio, TX USA Univ Texas San Antonio TX USA lth Sci Ctr, Div Dent, San Antonio, TX USA Univ Texas, Hlth Sci Ctr, Div Urol, San Antonio, TX USA Univ Texas San Antonio TX USA lth Sci Ctr, Div Urol, San Antonio, TX USA Vanderbilt Univ, Dept Biomed Engn, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 omed Engn, Nashville, TN 37235 USA
Titolo Testata:
JOURNAL OF ENDOUROLOGY
fascicolo: 2, volume: 14, anno: 2000,
pagine: 161 - 167
SICI:
0892-7790(200003)14:2<161:FELLTR>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
HOLMIUM-YAG LASER; FRAGMENTATION PROCESS; CLINICAL-EXPERIENCE; EFFICIENCY VARIES; URINARY CALCULI; PULSE DURATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Chan, KF Univ Texas, Dept Elect & Comp Engn, Austin, TX 78712 USA Univ Texas Austin TX USA 78712 & Comp Engn, Austin, TX 78712 USA
Citazione:
K.F. Chan et al., "Free electron laser lithotripsy: Threshold radiant exposures", J ENDOUROL, 14(2), 2000, pp. 161-167

Abstract

Purpose: To determine the threshold radiant exposures (J/cm(2)) needed forablation or fragmentation as a function of infrared wavelengths on variousurinary calculi and to determine if there is a relation between these thresholds and lithotripsy efficiencies with respect to optical absorption coefficients. Materials and Methods: Human calculi composed of uric acid, calcium oxalate monohydrate (COM), cystine, or magnesium ammonium phosphate hexahydrate (MAPH) were used. The calculi were irradiated in air with the free electron laser (FEL) at six wavelengths: 2.12, 2.5, 2.94, 3.13, 5, and 6.45 mu mResults: Threshold radiant exposures increased as optical absorption decreased. At the near-infrared wavelengths with low optical absorption, the thresholds were >1.5 J/cm(2). The thresholds decreased below 0.5 J/cm(2) for regions of high absorption for all the calculus types. Thresholds within thehigh-absorption regions were statistically different from those in the low-absorption regions, with P values much less than 0.05. Conclusions: Optical absorption coefficients or threshold radiant exposures can be used to predict lithotripsy efficiencies, For low ablation thresholds, smaller radiant exposures were required to achieve breakdown temperatures or to exceed the dynamic tensile strength of the material, Therefore, more energy is available for fragmentation, resulting in higher lithotripsy efficiencies.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 08:09:57