Imaging of cochlear implant electrode array with flat-detector CT and conventional multislice CT: comparison of image quality and radiation dose

Acta Otolaryngol. 2010 Apr;130(4):443-52. doi: 10.3109/00016480903292700.


Conclusion: Cochlear implantation assessment is possible using commercially available standard flat-detector computed tomography (FD-CT) protocols. Image quality is superior to multislice CT (MSCT). The radiation dose of FD-CT is lower in comparison with MSCT standard protocols and may therefore overcome the limitations of MSCT in the evaluation of cochlear implants.

Objective: FD-CT offers higher spatial resolution than MSCT. Our objective was to compare the image quality of FD-CT to conventional MSCT in the visualization of a cochlear implant electrode array with respect to radiation exposure.

Methods: An isolated temporal bone specimen was scanned using a commercially available FD-CT system and a 4 and 64 row MSCT scanner. Different scanning protocols were used. Image quality was assessed by four independent readers using a scoring system with different criteria describing delineation of the cochlea and the electrode array, image noise and spatial resolution. Radiation dose was measured using the CT dose index (CTDI) and a 16 cm acrylic phantom.

Results: Image quality was rated superior for FD-CT for all criteria by all readers. Single electrode contacts were only visible in FD-CT and assessment of implant position was improved by FD-CT. The radiation dose of FD-CT was half that of MSCT standard protocols.

Publication types

  • Comparative Study

MeSH terms

  • Artifacts
  • Cochlea / diagnostic imaging*
  • Cochlear Implants*
  • Electric Stimulation / methods
  • Electrodes, Implanted
  • Equipment Design
  • Facial Nerve / diagnostic imaging
  • Hearing Disorders / therapy
  • Humans
  • Image Enhancement / instrumentation*
  • Mastoid / diagnostic imaging
  • Mastoid / surgery
  • Postoperative Period
  • Radiation Dosage
  • Spiral Lamina / diagnostic imaging
  • Temporal Bone / diagnostic imaging*
  • Tomography, X-Ray Computed / instrumentation*
  • Tympanic Membrane / diagnostic imaging
  • Tympanic Membrane / surgery