Gallery of images.

Oregon Medical Laser Center Newsletter. Dec 1997. Steven Jacques.

This month we emphasize pulsed laser effects.

The purposes of this gallery are:

  • to point interested viewers toward sites that report their development of optical technologies for medicine.
  • to encourage the many other labs doing research on biomedical optics to post some images illustrating their work so that the general surfing audience can view our collective progress.

    Links are provided to the websites and viewers are encouraged to visit the original sites which have more pictures, discussions, references to papers, job opportunities, software, lists of staff, etc.

    Pulsed laser disruption of kidney stone.

    The Beckman Institute and Medical Clinic again places a photo in the gallery. This picture shows laser lithotripsy of a urinary stone. A pulsed laser irradiates the stone and elicits a small plasma whose shock wave fragments the stone. The patient can then pass the small fragments in the urine.

    Beckman Institute and Medical Clinic


    Laser thrombolysis: the disruption of a blood clot by a pulsed laser.

    The Oregon Medical Laser Center has been pioneering the use of a pulsed laser to disrupt blood clots in arteries. Applications include clearance of clots during myocardial infarction and during brain stroke due to clot formation. This picture shows a bench-top experiment in which a fiber disrupts a blood clot within a glass tube. Human studies have been conducted at Providence St. Vincent Medical Center in Portland, OR.

    Oregon Medical Laser Center


    Bubble formation at the fiber tip in 100/cm water and oil.

    The figure compares bubble formation in water vs in oil when the absorption coefficient of the medium is the same. Such studies are intended to learn the threshold for bubble formation and the relationship between bubble size and pulse energy. Bubble formation and subsequent bubble collapse are the key to disruption of blood clots. (From Chapter 3 of the PhD thesis by HanQun Shangguan.)

    Oregon Medical Laser Center

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