title: Silver halide fiber optic radiometric temperature measurement and control of CO2 laser-irradiated tissues and application to tissue welding.
abstract: Tissue heating by laser irradiation has attained importance in many clinical applications. Accurate temperature measurements of laser-irradiated tissues are difficult to achieve, and experiments have produced conflicting results. Fiber optic radiometry allows temperature measurement of laser-irradiated tissues by remote sensing of the emitted infra red (IR) radiation. We have developed an IR fiber optic radiometer capable of accurate tissue temperature measurements (+/- 0.2 degrees C) and utilized it to monitor and control the heating of tissues by CO2 laser irradiation. Tissue temperature control of +/- 2.5 degrees C was achieved. This system was used to control tissue temperature during CO2 laser-assisted welding of urinary bladders in rats. The strength of the welds was recorded for different welding temperatures. A temperature of 55 degrees C was found to be optimal.
authors.affiliation: Department of Urology, Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: O
authors.initials: O
authors.lastname: Shenfeld
authors.forename: E
authors.initials: E
authors.lastname: Ophir
authors.forename: B
authors.initials: B
authors.lastname: Goldwasser
authors.forename: A
authors.initials: A
authors.lastname: Katzir
mesh_terms: D000818:Animals; D002138:Calibration; D002245:Carbon Dioxide; D005260:Female; D005336:Fiber Optic Technology; D017075:Laser Coagulation / Q000379:methods; D007834:Lasers; D055100:Optical Fibers; D011874:Radiometry / Q000379:methods*; D051381:Rats; D017208:Rats, Wistar; D013821:Thermometers; D001743:Urinary Bladder / Q000528:radiation effects
chemical_list: D002245:Carbon Dioxide