Thermographic study of laser on arteries.
We analyzed the different effects of CO2, Nd-YAG, and argon lasers on aorta by using a Thermovision infrared system that registered the laser interaction with mongrel dog aorta. The images (thermograms) obtained were processed by a computer, which associated each area of the same temperature with a determined color. These thermograms were compared to histological analysis of the respective samples and the following results were obtained: (1) After the application of each laser there is very little propagation of heat in tissue. (2) The CO2 laser makes tissue reach 100 degrees C in less than 0.05 seconds. (3) The heat dissipation time was higher with the Nd-YAG laser due to higher scattering on tissue. Based on this research we conclude that the CO2 laser was best absorbed, the Nd-YAG laser penetrated human tissue with the best results, and the argon laser had the most significant backscattering.
D000818:Animals; D001011:Aorta / Q000293:injuries* / Q000473:pathology; D001128:Argon; D002245:Carbon Dioxide; D004285:Dogs; D006358:Hot Temperature / Q000009:adverse effects; D007091:Image Processing, Computer-Assisted; D007834:Lasers; D009354:Neodymium; D013817:Thermography
D002245:Carbon Dioxide; D009354:Neodymium; D001128:Argon