Temporal bone (modified Stenvers view)
Updates to Article Attributes
The modified Stenvers view is an oblique radiographic projection used to demonstrate the petrous temporal bone, IAM and bony labyrinth. It is primarily used to assess electrode placement following the insertion of a cochlear implant. Specifically it assesses the:
- integrity, positioning, and depth of insertion of the electrodes3
- and is used as a baseline 1
The central beam is positioned 45 degrees posteriorly and 12 degrees caudally. Performed as a PA projection, radiation to the orbits is minimised.
The obliquity of the beam positions it in the plane of the superior semi-circular canal. In a normally positioned cochlear implant (see images), the electrodes should be medial to the cochleostomy, which is approximated by a line drawn downward vertically through the superior semicircular canal 2. The more electrodes in the cochlear the better. At least 15For the best hearing outcomes, a minimum of 15 intra-cochlear electrodes has been suggested as the minimum is required reference needed3.
It has succeeded the Stenvers view, which includes more of the mastoid air cells.
-<li>integrity, positioning, and depth of insertion of the electrodes </li>- +<li>integrity, positioning, and depth of insertion of the electrodes <sup>3</sup>
- +</li>
-</ul><p>The central beam is positioned 45 degrees posteriorly and 12 degrees caudally. Performed as a PA projection, radiation to the orbits is minimised.</p><p>The obliquity of the beam positions it in the plane of the superior semi-circular canal. In a normally positioned cochlear implant (see images), the electrodes should be medial to the <a href="/articles/cochleostomy">cochleostomy</a>, which is approximated by a line drawn downward vertically through the superior semicircular canal <sup>2</sup>. The more electrodes in the cochlear the better. At least 15 electrodes has been suggested as the minimum <sup>reference needed</sup>.</p><p>It has succeeded the <a href="/articles/stenvers-view">Stenvers view</a>, which includes more of the mastoid air cells.</p>- +</ul><p>The central beam is positioned 45 degrees posteriorly and 12 degrees caudally. Performed as a PA projection, radiation to the orbits is minimised.</p><p>The obliquity of the beam positions it in the plane of the superior semi-circular canal. In a normally positioned cochlear implant (see images), the electrodes should be medial to the <a href="/articles/cochleostomy">cochleostomy</a>, which is approximated by a line drawn downward vertically through the superior semicircular canal <sup>2</sup>. The more electrodes in the cochlear the better. For the best hearing outcomes, a minimum of 15 intra-cochlear electrodes is required <sup>3</sup>.</p><p>It has succeeded the <a href="/articles/stenvers-view">Stenvers view</a>, which includes more of the mastoid air cells.</p>
References changed:
- 1. Jain R, Mukherji SK. Cochlear implant failure: imaging evaluation of the electrode course. Clin Radiol. 2003;58 (4): 288-93. <a href="http://www.ncbi.nlm.nih.gov/pubmed/12662949">Pubmed citation</a><span class="auto"></span>
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