Detection and quantification of endolymphatic hydrops in the guinea pig cochlea by magnetic resonance microscopy

Alec N. Salt, Miriam M. Henson, Sally L. Gewalt, Arthur W. Keating, John E. DeMott, O. W. Henson

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Three-dimensional magnetic resonance microscopy (MRM) was used to study normal and hydropic cochleae of the guinea pig. With this technique consecutive serial slices representing the entire volume of isolated, fixed cochleae were obtained. The voxels (volume elements) making up the contiguous slices were istotropic (25 μm3) and in each slice the boundaries of scala media, including the position of Reissner's membrane, were clearly delineated. Three-dimensional reconstructions of the endolymphatic and perilymphatic scalae were generated. Custom software was developed to quantify cross-sectional area (CSA) of all scalae. In the normal cochlea all 3 scalae, including scala media, showed a gradual decrease in CSA from base to apex. Marked differences existed between our findings and previously reported cochlear dimensions, especially for the perilymphatic scalae in the basal turn. In hydropic cochleae the scala media was enlarged to a varying extent in different turns and marked changes in the degree of distension of Reissner's membrane occurred along the cochlea. MRM and subsequent computer analysis of the isotropic data provide excellent methods for imaging and quantifying the fluid spaces of normal and hydropic cochleae.

Original languageEnglish
Pages (from-to)79-86
Number of pages8
JournalHearing research
Volume88
Issue number1-2
DOIs
StatePublished - Aug 1995

Keywords

  • Cochlea
  • Endolymph
  • Endolymphatic hydrops
  • MR microscopy
  • MRI
  • Magnetic resonance
  • Perilymph

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