Comparison with transient measurements of infrared radiation and stress wave for the practical ablation monitoring during photorefractive keratectomy

Miya Ishihara, Tsunenori Arai, Makoto Kikuchi, Hironori Nakano, Satoko Kawauchi, Minoru Obara

Research output: Contribution to journalConference article

Abstract

We compared infrared radiation measurement with stress wave measurement for real-time ablation monitoring during photorefractive keratectomy (PRK). We estimated temperature elevation which may be one of the most effective parameter for PRK monitoring, because the ablation mechanism is mainly attributed to thermal kinetics. The temperature elevation of ablated cornea was evaluated by the infrared radiation and the stress wave. The thermal radiation from irradiated cornea was detected by a MCT detector. The measured signal increased sharply just after the laser irradiation and decreased quasi-exponentially. We could calculate the temperature elevation by observed signal using Stefan-Boltzmann radiation law. In the case of the gelatin gel (15%wt) ablation in vitro, the temperature elevation was 97deg. at 208mJ/cm2 in the laser fluence. We also measured transient stress wave by the acoustic transducer which was made by polyvinylidene fluoride (PVDF) film. The temperature elevation could be calculated from the peak stress amplitude based on the short pulsed laser ablation theory. The good agreement on the temperature elevation was obtained between the infrared and the stress based estimations. Due to non-contact and non-invasive method, our infrared measurements for temperature elevation monitoring may be available to accomplish the feedback control on the PRK.

Original languageEnglish
Pages (from-to)319-324
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3254
DOIs
Publication statusPublished - 1998 Dec 1
EventLaser-Tissue Interaction IX - San Jose, CA, United States
Duration: 1998 Jan 261998 Jan 28

Keywords

  • Ablation
  • ArF excimer laser
  • Photorefractive keratectomy(PRK)
  • Temperature

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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