Detection of pre-charring optical behavior at a laser catheter-tip in blood: Ex vivo and in vivo study

Mei Takahashi, Arisa Ito, Takuro Kajihara, Tsunenori Arai

研究成果: Conference contribution

1 被引用数 (Scopus)


We studied a pre-charring optical behavior of blood at a laser catheter-tip during a red laser irradiation (663 nm, CW) with around 50 W/cm2 in blood to prevent charring at the laser catheter-tip. The laser irradiated red-blood-cell shape changes were microscopically observed. A round formation, aggregation, and hemolysis were found until blood charring (ex vivo). A time-history of diffuse-reflected light power and transmitted light power from a thin blood layer which was irradiated by the red laser were measured with microscope optics to investigate the charring process. The diffusereflected light power decreased following a gentle peak before the charring. This decrease indicated the pre-charring behavior which might be induced by scattering and absorption changes due to red-blood-cell degenerations described above. Using the laser catheter located in porcine heart, we successfully detected the pre-charring behavior by a backscattering light power (in vivo). We demonstrated charring prevention availability with the laser power control (ex vivo). We think that the backscattering light power measurement and laser power control via the laser catheter might be useful to detect pre-charring behavior, and to prevent the charring for therapeutic laser irradiation in blood under catheterization such as arrhythmia treatment with photodynamic therapy.

ホスト出版物のタイトルOptical Interactions with Tissue and Cells XXII
出版ステータスPublished - 2011 4月 29
イベントOptical Interactions with Tissue and Cells XXII - San Francisco, CA, United States
継続期間: 2011 1月 242011 1月 26


名前Progress in Biomedical Optics and Imaging - Proceedings of SPIE


OtherOptical Interactions with Tissue and Cells XXII
国/地域United States
CitySan Francisco, CA

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 原子分子物理学および光学
  • 放射線学、核医学およびイメージング


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