Modified Stenvers view
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 electrodes 3
- 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 minimized.
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 cochlea the better. For the best hearing outcomes, a minimum of 15 intra-cochlear electrodes is required 3.
- 1. Shpizner BA, Holliday RA, Roland JT et-al. Postoperative imaging of the multichannel cochlear implant. AJNR Am J Neuroradiol. 1995;16 (7): 1517-24. Pubmed citation
- 2. Marsot-Dupuch K, Meyer B. Cochlear implant assessment: imaging issues. Eur J Radiol. 2002;40 (2): 119-32. Pubmed citation
- 3. Jain R, Mukherji SK. Cochlear implant failure: imaging evaluation of the electrode course. Clin Radiol. 2003;58 (4): 288-93. Pubmed citation