Cochlear implant
Updates to Article Attributes
Cochlear implants (CI) are a surgically implanted electronic device that provides a sense of sound to a person who is profoundly deaf or severely hard of hearing. Unlike conventional hearing aids, the cochlear implant does not amplify sound, but works by directly stimulating any functioning auditory nerves inside the cochlea with an electric field.
External components of the cochlear implant include a microphone, speech processor and a radiofrequency (RF) transducer or primary headpiece coil. A secondary coil is implanted beneath the scalp and inductively coupled to the primary headpiece coil.
The implant gives recipients additional auditory information, which may include sound discrimination fine enough to understand speech in quiet environments. Post-implantation rehabilitative therapy is often critical to ensuring successful outcomes.
Radiographic features
Before assessing post operative imaging it is important to note the route in which the implant has been inserted, it can be one of three ways via the 12:
round window (the preferred method)
extended round window (where the round window is enlarged and opened via drilling of the anterior-inferior margin)
cochleostomy
Plain radiograph
Post operative plain film radiography of the temporal bones are sufficient in a majority of patients. Plain radiography is the most helpful modality to assess for extrusion and superior in assessing the number of inserted electrodes. Typically a modified Stenvers view is performed, which has succeeded the original Stenvers view.
Correct placement of the electrodes are within the scala tympani regions 11
CT
Particularly useful when postoperative radiographs fail to demonstrate the location of the electrode array adequately or if postoperative infection is suspected 1.
Usually thin-collimation (≤1 mm) scanning performed contiguously or with a 0.5–1-mm overlap is required.
-<p><strong>Cochlear implants (CI)</strong> are a surgically implanted electronic device that provides a sense of sound to a person who is profoundly deaf or severely hard of hearing. Unlike conventional hearing aids, the cochlear implant does not amplify sound, but works by directly stimulating any functioning auditory nerves inside the <a href="/articles/cochlea">cochlea</a> with an electric field.</p><p>External components of the cochlear implant include a microphone, speech processor and a radiofrequency (RF) transducer or primary headpiece coil. A secondary coil is implanted beneath the scalp and inductively coupled to the primary headpiece coil.</p><p>The implant gives recipients additional auditory information, which may include sound discrimination fine enough to understand speech in quiet environments. Post-implantation rehabilitative therapy is often critical to ensuring successful outcomes.</p><h4>Radiographic features</h4><h5>Plain radiograph</h5><p>Post operative plain film radiography of the temporal bones are sufficient in a majority of patients. Plain radiography is the most helpful modality to assess for extrusion and superior in assessing the number of inserted electrodes. Typically a <a href="/articles/temporal-bone-modified-stenvers-view">modified Stenvers view</a> is performed, which has succeeded the original <a href="/articles/temporal-bone-stenvers-view">Stenvers view</a>. </p><p>Correct placement of the electrodes are within the <a href="/articles/scala-tympani">scala tympani</a> regions <sup>11</sup></p><h5>CT</h5><p>Particularly useful when postoperative radiographs fail to demonstrate the location of the electrode array adequately or if postoperative infection is suspected <sup>1</sup>. </p><p>Usually thin-collimation (≤1 mm) scanning performed contiguously or with a 0.5–1-mm overlap is required. </p>- +<p><strong>Cochlear implants (CI)</strong> are a surgically implanted electronic device that provides a sense of sound to a person who is profoundly deaf or severely hard of hearing. Unlike conventional hearing aids, the cochlear implant does not amplify sound, but works by directly stimulating any functioning auditory nerves inside the <a href="/articles/cochlea">cochlea</a> with an electric field.</p><p>External components of the cochlear implant include a microphone, speech processor and a radiofrequency (RF) transducer or primary headpiece coil. A secondary coil is implanted beneath the scalp and inductively coupled to the primary headpiece coil.</p><p>The implant gives recipients additional auditory information, which may include sound discrimination fine enough to understand speech in quiet environments. Post-implantation rehabilitative therapy is often critical to ensuring successful outcomes.</p><h4>Radiographic features</h4><p>Before assessing post operative imaging it is important to note the route in which the implant has been inserted, it can be one of three ways via the <sup>12</sup>: </p><ul>
- +<li><p> round window (the preferred method)</p></li>
- +<li><p>extended round window (where the round window is enlarged and opened via drilling of the anterior-inferior margin)</p></li>
- +<li><p>cochleostomy</p></li>
- +</ul><h5>Plain radiograph</h5><p>Post operative plain film radiography of the temporal bones are sufficient in a majority of patients. Plain radiography is the most helpful modality to assess for extrusion and superior in assessing the number of inserted electrodes. Typically a <a href="/articles/temporal-bone-modified-stenvers-view">modified Stenvers view</a> is performed, which has succeeded the original <a href="/articles/temporal-bone-stenvers-view">Stenvers view</a>. </p><p>Correct placement of the electrodes are within the <a href="/articles/scala-tympani">scala tympani</a> regions <sup>11</sup></p><h5>CT</h5><p>Particularly useful when postoperative radiographs fail to demonstrate the location of the electrode array adequately or if postoperative infection is suspected <sup>1</sup>. </p><p>Usually thin-collimation (≤1 mm) scanning performed contiguously or with a 0.5–1-mm overlap is required. </p>
References changed:
- 12. Widmann G, Dejaco D, Luger A, Schmutzhard J. Pre- and Post-Operative Imaging of Cochlear Implants: A Pictorial Review. Insights Imaging. 2020;11(1):93. <a href="https://doi.org/10.1186/s13244-020-00902-6">doi:10.1186/s13244-020-00902-6</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/32803542">Pubmed</a>
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