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Extent of thermal penetration of Nd-YAG laser — histological considerations

  • II. Laser in neurosurgery
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Summary

The extent of thermal penetration of Nd-YAG laser was studied histologically. The material was obtained from seven cases of various types of intracranial and extracranial tumours and normal temporal muscle obtained at operation. After irradiation of the tumour surface with the laser, the tumours were removed and depth and width of pathological changes caused by heat were studied. Histologically, materials consisted of a vaporized surface, carbonized, vesicular, necrotic, oedematous layers and surrounding intact brain tumour tissue. There was a direct relationship between the thermal effect and the irradiated thermal energy (watt × exposure time × pulse number). The results showed that the thermal effect was limited to a depth of 6 to 10 mm from the irradiated surface when irradiated 4 times at the power of 90 watts for 2 seconds.

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Authors and Affiliations

  1. Department of Neurosurgery, Kyoto University, Medical School, Kyoto, Japan

    Tatsuhito Yamagami, Hajime Handa, Juji Takeuchi, Nobuo Hashimoto, Waro Taki, Yasuhiro Yonekawa & Hirokazu Otsuki

  2. Department of Neurosurgery, Kyoto University Hospital, 54 Shogoin, Kawahara-Cho Sakyo-ku, 609, Kyoto, Japan

    Tatsuhito Yamagami

  3. Department of Neurosurgery, Fukui Red Cross Hospital, Japan

    Juji Takeuchi

Authors
  1. Tatsuhito Yamagami
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  2. Hajime Handa
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  3. Juji Takeuchi
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  4. Nobuo Hashimoto
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  5. Waro Taki
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  6. Yasuhiro Yonekawa
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  7. Hirokazu Otsuki
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Yamagami, T., Handa, H., Takeuchi, J. et al. Extent of thermal penetration of Nd-YAG laser — histological considerations. Neurosurg. Rev. 7, 165–170 (1984). https://doi.org/10.1007/BF01780700

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