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 proceedingConference contribution

38 Citations (Scopus)

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 languageEnglish (US)
Title of host publicationLaser-Tissue Interaction III
PublisherSPIE
Pages107-117
Number of pages11
Volume1646
ISBN (Electronic)9780819407924
DOIs
StatePublished - Aug 7 1992
EventLaser-Tissue Interaction III 1992 - Los Angeles, United States
Duration: Jan 19 1992Jan 24 1992

Other

OtherLaser-Tissue Interaction III 1992
CountryUnited States
CityLos Angeles
Period1/19/921/24/92

Fingerprint

Diode Laser
liver
Liver
Semiconductor lasers
Coagulation
semiconductor lasers
coagulation
Laser
Lasers
Absorption
Wavelength
rats
blood
lasers
Blood
Rats
dogs
Irradiance
Evaporation
irradiance

ASJC Scopus subject areas

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

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 Laser-Tissue Interaction III (Vol. 1646, pp. 107-117). 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; Thomsen, Sharon L.; Schwartz, John; Torres, Jorge; Mannonen, Illka.

Laser-Tissue Interaction III. Vol. 1646 SPIE, 1992. p. 107-117.

Research output: Chapter in Book/Report/Conference proceedingConference 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 Laser-Tissue Interaction III. 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
Jacques SL, Rastegar S, Motamedi M, Thomsen SL, Schwartz J, Torres J et al. Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm). In Laser-Tissue Interaction III. Vol. 1646. SPIE. 1992. p. 107-117 https://doi.org/10.1117/12.137451
Jacques, Steven L. ; Rastegar, Sohi ; Motamedi, Massoud ; Thomsen, Sharon L. ; Schwartz, John ; Torres, Jorge ; Mannonen, Illka. / Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm). Laser-Tissue Interaction III. Vol. 1646 SPIE, 1992. pp. 107-117
@inproceedings{5262ab7dd3a7465db4ebb1ebe44f0282,
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.",
author = "Jacques, {Steven L.} and Sohi Rastegar and Massoud Motamedi and Thomsen, {Sharon L.} and John Schwartz and Jorge Torres and Illka Mannonen",
year = "1992",
month = "8",
day = "7",
doi = "10.1117/12.137451",
language = "English (US)",
volume = "1646",
pages = "107--117",
booktitle = "Laser-Tissue Interaction III",
publisher = "SPIE",

}

TY - GEN

T1 - Liver photocoagulation with diode laser (805 nm) vs NdrYAG laser (1064 nm)

AU - Jacques, Steven L.

AU - Rastegar, Sohi

AU - Motamedi, Massoud

AU - Thomsen, Sharon L.

AU - Schwartz, John

AU - Torres, Jorge

AU - Mannonen, Illka

PY - 1992/8/7

Y1 - 1992/8/7

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.

UR - http://www.scopus.com/inward/record.url?scp=84884226941&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84884226941&partnerID=8YFLogxK

U2 - 10.1117/12.137451

DO - 10.1117/12.137451

M3 - Conference contribution

AN - SCOPUS:84884226941

VL - 1646

SP - 107

EP - 117

BT - Laser-Tissue Interaction III

PB - SPIE

ER -