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Power spectrum analysis of ultrasonogram in ophthalmology Hiroshi Okakura 1 1Dep. of Ophthalmol., St. Marianna Univ. Sch. of Med. pp.861-866
Published Date 1985/7/15
DOI https://doi.org/10.11477/mf.1410209486
  • Abstract
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A-mode frequency signals from pathologic lesions in the vitreous were analyzed as to their power spectrum components. This method provided with clinical data about attenuation characteristics of unique value that is not available with convention-al A-or B-mode ultrasonography. It was possible to specifically identify the intravitreal membranes and detached retina based on the wave-form pattern in the high-frequency range of 10 to 64 MHz of A-mode power spectrum.

Our findings indicate that mode-locked YAG laser may be used effectively and safely in treating membranes or strands located in the middle or posterior vitreous.


Copyright © 1985, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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