High-speed flat-detector computed tomography for temporal bone imaging and postoperative control of cochlear implants.
Neuroradiology
; 64(7): 1437-1445, 2022 Jul.
Article
em En
| MEDLINE
| ID: mdl-35410396
ABSTRACT
PURPOSE:
Flat-detector computed tomography (FD-CT) is the standard for cochlear implant (CI) imaging. FD-CT systems differ in technical characteristics. Our aim was an evaluation of two different FD-CT generations with different protocols and hardware regarding image quality, radiation dose, and scan time.METHODS:
Two temporal bone specimens (- / + CI = TB0/TB1) were scanned using three different scanners two FD-CT systems with different scanning protocols (standard FD-CT 20 s 70 kV, 20 s 109 kV; high-speed FD-CT [HS-FD-CT] 7 s 109 kV, 9 s 109 kV, 14 s 72 kV) and MS-CT (5 s 120 kV). Acquired datasets were evaluated in consensus reading regarding qualitative and quantitative parameters addressing CI- and cochlea-specific parameters, cochlea delineation, lamina spiralis ossea visibility, distinction of single CI electrodes, determination of intracochlear implant position, stapes delineation, and mastoidal septation were assessed. Addressing protocol-specific parameters, radiation dose (dose-length-product/DLP), and scan time were assessed.RESULTS:
Two HS-FD-CT protocols (14 s/9 s) provide higher or equivalent diagnostic information regarding CI- and cochlea-specific parameters compared to both standard FD-CT protocols. The fastest HS-FD-CT protocol (7 s)-providing inferior diagnostic information compared to all other FD-CT protocols-still exceeds MS-CT. The highest DLP was recorded for the 14 s HS-FD-CT protocol (TB1 = 956 mGycm); the lowest DLPs were recorded for the 7 s HS-FD-CT protocol (TB0 = 188 mGycm) and for MS-CT (TB0 = 138 mGycm), respectively. HS-FD-CT allows a significant reduction of scan time compared to standard FD-CT.CONCLUSION:
High-speed FD-CT improves visualization of temporal bone anatomy and postoperative assessment of CIs by combining excellent image quality, fast scan time, and reasonable radiation exposure.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Implantes Cocleares
Tipo de estudo:
Guideline
/
Qualitative_research
Limite:
Humans
Idioma:
En
Revista:
Neuroradiology
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Alemanha