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Related Experiment Videos

Ultrasonically guided interstitial Nd-YAG laser diffuser tip hyperthermia: an in vitro study.

C P Nolsøe1, S Torp-Pedersen, H H Holm

  • 1Department of Ultrasound, Herlev Hospital, University of Copenhagen, Denmark.

Scandinavian Journal of Urology and Nephrology. Supplementum
|January 1, 1991
PubMed
Summary

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Ultrasonically guided interstitial Nd-YAG laser diffuser tip hyperthermia uses ultrasound to guide laser placement for tumor treatment. This technique allows real-time monitoring and shows potential for treating visible cancers like liver metastases and prostate cancer.

Area of Science:

  • Medical physics
  • Oncology
  • Interventional radiology

Background:

  • Interstitial Nd-YAG laser diffuser tip hyperthermia is an emerging technique for localized tissue treatment.
  • Previous work established predictable spherical coagulation with modified laser fibers.
  • Real-time ultrasound monitoring is crucial for precise interstitial procedures.

Purpose of the Study:

  • To develop and evaluate an ultrasonically guided technique for interstitial Nd-YAG laser hyperthermia.
  • To enable simultaneous laser irradiation and interstitial temperature monitoring.
  • To assess the accuracy of ultrasound in measuring laser-induced lesions.

Main Methods:

  • Placement of a modified Nd-YAG laser fiber into solid tissue under real-time ultrasound guidance.

Related Experiment Videos

  • Simultaneous laser irradiation and interstitial temperature measurements.
  • Real-time ultrasound monitoring of lesion development.

    • Main Results:

    • Laser lesions appeared as hyperechoic areas on ultrasound, increasing with applied energy.
    • Macroscopically, lesions were spherical with central cavitation and surrounding coagulation.
    • A strong correlation (r = 0.89) was found between ultrasonically and macroscopically measured lesion diameters.

    Conclusions:

    • Ultrasonically guided interstitial Nd-YAG laser diffuser tip hyperthermia is a viable technique.
    • The method allows for precise control and monitoring of laser-induced thermal lesions.
    • This technique shows promise for treating ultrasonically visible neoplasias, including liver metastases and prostate cancer.