Channeling in myocardium tissue through nanosecond pulsed laser photodisruption at visible and near-infrared wavelengths

M. Ogura, S. Sato, Tsunenori Arai, M. Ishihara, S. Kawauchi, T. Matsui, A. Kurita, M. Kikuchi, H. Wakisaka, H. Ashida, M. Obara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We investigated in vitro the mechanism of myocardium tissue ablation with nanosecond pulsed laser at the visible and near-infrared wavelengths. In experiments, porcine myocardium tissue was used as sample. It was found that the ablation rate at 1064 nm was larger than that at 532 nm in spite of lower absorption coefficient at 1064 nm than that at 532 nm for the tissue. During ablation the laser-induced optical emission intensity was measured and it was correlated with the ablation depth. Ablated tissue samples were fixed and stained, and histological analysis was performed with an optical microscope and a polarization microscope. For the 1064-nm laser-ablated tissues thermal damage was very limited, although damage that was presumably caused by mechanical effect was observed. The optical emission intensity during the 1064-nm laser ablation was higher than that during the 532-nm laser ablation at the same laser intensity. And for the 1064-nm laser ablation the ablation threshold was nearly equivalent to the optical emission. Based on these experimental results, we concluded that with the 1064-nm laser light, the tissue removal was achieved through a photodisruption process. Application of 1064-nm, nanosecond pulsed laser photodisruption to transmyocardial laser revascularization(TMLR) was discussed.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsD.D. Duncan, S.L. Jacques, P.C. Johnson
Pages312-316
Number of pages5
Volume4257
DOIs
Publication statusPublished - 2001
EventLaser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical - San Jose, CA, United States
Duration: 2001 Jan 212001 Jan 24

Other

OtherLaser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical
CountryUnited States
CitySan Jose, CA
Period01/1/2101/1/24

Fingerprint

myocardium
Pulsed lasers
Ablation
pulsed lasers
ablation
Tissue
Infrared radiation
Wavelength
Laser ablation
Lasers
wavelengths
laser ablation
light emission
lasers
Microscopes
damage
optical microscopes
absorptivity
microscopes
Polarization

Keywords

  • Laser ablation
  • Laser-induced plasma
  • Myocardium tissue
  • Near-infrared
  • Photodisruption
  • Q-switched Nd:YAG laser
  • Thermal damage
  • Transmyocardial laser revascularizaiton(TMLR)
  • Visible

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Ogura, M., Sato, S., Arai, T., Ishihara, M., Kawauchi, S., Matsui, T., ... Obara, M. (2001). Channeling in myocardium tissue through nanosecond pulsed laser photodisruption at visible and near-infrared wavelengths. In D. D. Duncan, S. L. Jacques, & P. C. Johnson (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4257, pp. 312-316) https://doi.org/10.1117/12.434714

Channeling in myocardium tissue through nanosecond pulsed laser photodisruption at visible and near-infrared wavelengths. / Ogura, M.; Sato, S.; Arai, Tsunenori; Ishihara, M.; Kawauchi, S.; Matsui, T.; Kurita, A.; Kikuchi, M.; Wakisaka, H.; Ashida, H.; Obara, M.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / D.D. Duncan; S.L. Jacques; P.C. Johnson. Vol. 4257 2001. p. 312-316.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ogura, M, Sato, S, Arai, T, Ishihara, M, Kawauchi, S, Matsui, T, Kurita, A, Kikuchi, M, Wakisaka, H, Ashida, H & Obara, M 2001, Channeling in myocardium tissue through nanosecond pulsed laser photodisruption at visible and near-infrared wavelengths. in DD Duncan, SL Jacques & PC Johnson (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4257, pp. 312-316, Laser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical, San Jose, CA, United States, 01/1/21. https://doi.org/10.1117/12.434714
Ogura M, Sato S, Arai T, Ishihara M, Kawauchi S, Matsui T et al. Channeling in myocardium tissue through nanosecond pulsed laser photodisruption at visible and near-infrared wavelengths. In Duncan DD, Jacques SL, Johnson PC, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4257. 2001. p. 312-316 https://doi.org/10.1117/12.434714
Ogura, M. ; Sato, S. ; Arai, Tsunenori ; Ishihara, M. ; Kawauchi, S. ; Matsui, T. ; Kurita, A. ; Kikuchi, M. ; Wakisaka, H. ; Ashida, H. ; Obara, M. / Channeling in myocardium tissue through nanosecond pulsed laser photodisruption at visible and near-infrared wavelengths. Proceedings of SPIE - The International Society for Optical Engineering. editor / D.D. Duncan ; S.L. Jacques ; P.C. Johnson. Vol. 4257 2001. pp. 312-316
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abstract = "We investigated in vitro the mechanism of myocardium tissue ablation with nanosecond pulsed laser at the visible and near-infrared wavelengths. In experiments, porcine myocardium tissue was used as sample. It was found that the ablation rate at 1064 nm was larger than that at 532 nm in spite of lower absorption coefficient at 1064 nm than that at 532 nm for the tissue. During ablation the laser-induced optical emission intensity was measured and it was correlated with the ablation depth. Ablated tissue samples were fixed and stained, and histological analysis was performed with an optical microscope and a polarization microscope. For the 1064-nm laser-ablated tissues thermal damage was very limited, although damage that was presumably caused by mechanical effect was observed. The optical emission intensity during the 1064-nm laser ablation was higher than that during the 532-nm laser ablation at the same laser intensity. And for the 1064-nm laser ablation the ablation threshold was nearly equivalent to the optical emission. Based on these experimental results, we concluded that with the 1064-nm laser light, the tissue removal was achieved through a photodisruption process. Application of 1064-nm, nanosecond pulsed laser photodisruption to transmyocardial laser revascularization(TMLR) was discussed.",
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AB - We investigated in vitro the mechanism of myocardium tissue ablation with nanosecond pulsed laser at the visible and near-infrared wavelengths. In experiments, porcine myocardium tissue was used as sample. It was found that the ablation rate at 1064 nm was larger than that at 532 nm in spite of lower absorption coefficient at 1064 nm than that at 532 nm for the tissue. During ablation the laser-induced optical emission intensity was measured and it was correlated with the ablation depth. Ablated tissue samples were fixed and stained, and histological analysis was performed with an optical microscope and a polarization microscope. For the 1064-nm laser-ablated tissues thermal damage was very limited, although damage that was presumably caused by mechanical effect was observed. The optical emission intensity during the 1064-nm laser ablation was higher than that during the 532-nm laser ablation at the same laser intensity. And for the 1064-nm laser ablation the ablation threshold was nearly equivalent to the optical emission. Based on these experimental results, we concluded that with the 1064-nm laser light, the tissue removal was achieved through a photodisruption process. Application of 1064-nm, nanosecond pulsed laser photodisruption to transmyocardial laser revascularization(TMLR) was discussed.

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