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

Abstract:

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.

journal_name

Acta Otolaryngol

journal_title

Acta oto-laryngologica

authors

Struffert T,Hertel V,Kyriakou Y,Krause J,Engelhorn T,Schick B,Iro H,Hornung J,Doerfler A

doi

10.3109/00016480903292700

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

443-52

issue

4

eissn

0001-6489

issn

1651-2251

pii

10.3109/00016480903292700

journal_volume

130

pub_type

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