Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm)

Steven L. Jacques; Sohi Rastegar; Massoud Motamedi; Sharon L. Thomsen; John Schwartz; Jorge Torres; Illka Mannonen

doi:10.1117/12.137451

Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm)

Steven L. Jacques, Sohi Rastegar, Massoud Motamedi, Sharon L. Thomsen, John Schwartz, Jorge Torres, Illka Mannonen

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

49 Scopus citations

Abstract

Experiments in dog and rat liver compared the 805-nm wavelength of the diode laser and the 1064-nm wavelength of the NdrYAG laser. (1) The major optical differences are in the absorption. The optical properties of dog liver were determined by integrating sphere experiments. The scattering coefficients were similar at both wavelengths, but the absorption was 3.5-fold greater for the diode laser wavelength. Consequently, the diode laser penetrated less deeply and heated the liver surface more strongly than the NdrYAG laser. (2) Blood is an major component of liver absorption. When blood accumulated in the lower region of a rat liver held sideways, surface heating (measured by infrared camera) by the diode laser increased due to increased absorption by the pooled blood. (3) Tissue optics and irradiance geometry together affect the zone of thermal coagulation caused by each laser. The sizes of coagulation lesions in rat liver in vivo indicated larger zones of coagulation with the NdrYAG laser. Our working hypothesis is that the diode laser caused greater surface heating and water evaporation which meant less energy remained in the tissue. Enlarging the spot size of irradiance should alleviate such surface overheating and evaporation losses and maximize the zone of coagulation. The similarities between the two lasers are more striking than the differences.

Original language	English (US)
Title of host publication	Laser-Tissue Interaction III
Editors	Steven L. Jacques
Publisher	SPIE
Pages	107-117
Number of pages	11
ISBN (Electronic)	9780819407924
DOIs	https://doi.org/10.1117/12.137451
State	Published - Aug 7 1992
Externally published	Yes
Event	Laser-Tissue Interaction III 1992 - Los Angeles, United States Duration: Jan 19 1992 → Jan 24 1992

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	1646
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Laser-Tissue Interaction III 1992
Country/Territory	United States
City	Los Angeles
Period	1/19/92 → 1/24/92

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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10.1117/12.137451

Cite this

Jacques, S. L., Rastegar, S., Motamedi, M., Thomsen, S. L., Schwartz, J., Torres, J., & Mannonen, I. (1992). Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm). In S. L. Jacques (Ed.), Laser-Tissue Interaction III (pp. 107-117). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 1646). SPIE. https://doi.org/10.1117/12.137451

Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm). / Jacques, Steven L.; Rastegar, Sohi; Motamedi, Massoud et al.
Laser-Tissue Interaction III. ed. / Steven L. Jacques. SPIE, 1992. p. 107-117 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 1646).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Jacques, SL, Rastegar, S, Motamedi, M, Thomsen, SL, Schwartz, J, Torres, J & Mannonen, I 1992, Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm). in SL Jacques (ed.), Laser-Tissue Interaction III. Proceedings of SPIE - The International Society for Optical Engineering, vol. 1646, SPIE, pp. 107-117, Laser-Tissue Interaction III 1992, Los Angeles, United States, 1/19/92. https://doi.org/10.1117/12.137451

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title = "Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm)",

abstract = "Experiments in dog and rat liver compared the 805-nm wavelength of the diode laser and the 1064-nm wavelength of the NdrYAG laser. (1) The major optical differences are in the absorption. The optical properties of dog liver were determined by integrating sphere experiments. The scattering coefficients were similar at both wavelengths, but the absorption was 3.5-fold greater for the diode laser wavelength. Consequently, the diode laser penetrated less deeply and heated the liver surface more strongly than the NdrYAG laser. (2) Blood is an major component of liver absorption. When blood accumulated in the lower region of a rat liver held sideways, surface heating (measured by infrared camera) by the diode laser increased due to increased absorption by the pooled blood. (3) Tissue optics and irradiance geometry together affect the zone of thermal coagulation caused by each laser. The sizes of coagulation lesions in rat liver in vivo indicated larger zones of coagulation with the NdrYAG laser. Our working hypothesis is that the diode laser caused greater surface heating and water evaporation which meant less energy remained in the tissue. Enlarging the spot size of irradiance should alleviate such surface overheating and evaporation losses and maximize the zone of coagulation. The similarities between the two lasers are more striking than the differences.",

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AU - Torres, Jorge

AU - Mannonen, Illka

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N2 - Experiments in dog and rat liver compared the 805-nm wavelength of the diode laser and the 1064-nm wavelength of the NdrYAG laser. (1) The major optical differences are in the absorption. The optical properties of dog liver were determined by integrating sphere experiments. The scattering coefficients were similar at both wavelengths, but the absorption was 3.5-fold greater for the diode laser wavelength. Consequently, the diode laser penetrated less deeply and heated the liver surface more strongly than the NdrYAG laser. (2) Blood is an major component of liver absorption. When blood accumulated in the lower region of a rat liver held sideways, surface heating (measured by infrared camera) by the diode laser increased due to increased absorption by the pooled blood. (3) Tissue optics and irradiance geometry together affect the zone of thermal coagulation caused by each laser. The sizes of coagulation lesions in rat liver in vivo indicated larger zones of coagulation with the NdrYAG laser. Our working hypothesis is that the diode laser caused greater surface heating and water evaporation which meant less energy remained in the tissue. Enlarging the spot size of irradiance should alleviate such surface overheating and evaporation losses and maximize the zone of coagulation. The similarities between the two lasers are more striking than the differences.

AB - Experiments in dog and rat liver compared the 805-nm wavelength of the diode laser and the 1064-nm wavelength of the NdrYAG laser. (1) The major optical differences are in the absorption. The optical properties of dog liver were determined by integrating sphere experiments. The scattering coefficients were similar at both wavelengths, but the absorption was 3.5-fold greater for the diode laser wavelength. Consequently, the diode laser penetrated less deeply and heated the liver surface more strongly than the NdrYAG laser. (2) Blood is an major component of liver absorption. When blood accumulated in the lower region of a rat liver held sideways, surface heating (measured by infrared camera) by the diode laser increased due to increased absorption by the pooled blood. (3) Tissue optics and irradiance geometry together affect the zone of thermal coagulation caused by each laser. The sizes of coagulation lesions in rat liver in vivo indicated larger zones of coagulation with the NdrYAG laser. Our working hypothesis is that the diode laser caused greater surface heating and water evaporation which meant less energy remained in the tissue. Enlarging the spot size of irradiance should alleviate such surface overheating and evaporation losses and maximize the zone of coagulation. The similarities between the two lasers are more striking than the differences.

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Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm)

Abstract

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