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International Journal of Computer Assisted Radiology and Surgery
Published in: International Journal of Computer Assisted Radiology and Surgery 10/2016

01-10-2016 | Original Article

Validity of linear measurements of the jaws using ultralow-dose MDCT and the iterative techniques of ASIR and MBIR

Authors: Asma’a A. Al-Ekrish, Reema Al-Shawaf, Peter Schullian, Ra’ed Al-Sadhan, Romed Hörmann, Gerlig Widmann

Published in: International Journal of Computer Assisted Radiology and Surgery | Issue 10/2016

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Abstract

Purpose

To assess the comparability of linear measurements of dental implant sites recorded from multidetector computed tomography (MDCT) images obtained using standard-dose filtered backprojection (FBP) technique with those from various ultralow doses combined with FBP, adaptive statistical iterative reconstruction (ASIR), and model-based iterative reconstruction (MBIR) techniques. The results of the study may contribute to MDCT dose optimization for dental implant site imaging.

Methods

MDCT scans of two cadavers were acquired using a standard reference protocol and four ultralow-dose test protocols (TP). The volume CT dose index of the different dose protocols ranged from a maximum of 30.48–36.71 mGy to a minimum of 0.44–0.53 mGy. All scans were reconstructed using FBP, ASIR-50, ASIR-100, and MBIR, and either a bone or standard reconstruction kernel. Linear measurements were recorded from standardized images of the jaws by two examiners. Intra- and inter-examiner reliability of the measurements were analyzed using Cronbach’s alpha and inter-item correlation. Agreement between the measurements obtained with the reference-dose/FBP protocol and each of the test protocols was determined with Bland–Altman plots and linear regression. Statistical significance was set at a P-value of 0.05.

Results

No systematic variation was found between the linear measurements obtained with the reference protocol and the other imaging protocols. The only exceptions were TP3/ASIR-50 (bone kernel) and TP4/ASIR-100 (bone and standard kernels). The mean measurement differences between these three protocols and the reference protocol were within ±0.1 mm, with the 95 % confidence interval limits being within the range of ±1.15 mm.

Conclusions

A nearly 97.5 % reduction in dose did not significantly affect the height and width measurements of edentulous jaws regardless of the reconstruction algorithm used.
Appendix
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Metadata
Title
Validity of linear measurements of the jaws using ultralow-dose MDCT and the iterative techniques of ASIR and MBIR
Authors
Asma’a A. Al-Ekrish
Reema Al-Shawaf
Peter Schullian
Ra’ed Al-Sadhan
Romed Hörmann
Gerlig Widmann
Publication date
01-10-2016
Publisher
Springer Berlin Heidelberg
Published in
International Journal of Computer Assisted Radiology and Surgery / Issue 10/2016
Print ISSN: 1861-6410
Electronic ISSN: 1861-6429
DOI
https://doi.org/10.1007/s11548-016-1419-y

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