Optimizing the reconstruction filter in cone-beam CT to improve periodontal ligament space visualization: An in vitro study.
10.5624/isd.2017.47.3.199
- Author:
Yuuki HOUNO
1
;
Toshimitsu HISHIKAWA
;
Ken ichi GOTOH
;
Munetaka NAITOH
;
Akio MITANI
;
Toshihide NOGUCHI
;
Eiichiro ARIJI
;
Yoshie KODERA
Author Information
1. Graduate School of Medicine, Nagoya University, Japan.
- Publication Type:Original Article
- Keywords:
Cone-Beam Computed Tomography;
Image Processing, Computer-Assisted;
Phantoms, Imaging;
Periodontal Ligament
- MeSH:
Cone-Beam Computed Tomography*;
Diagnosis;
Evaluation Studies as Topic;
Image Processing, Computer-Assisted;
In Vitro Techniques*;
Matched-Pair Analysis;
Methods;
Periodontal Ligament*;
Phantoms, Imaging;
Skull;
Stomatognathic Diseases
- From:Imaging Science in Dentistry
2017;47(3):199-207
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: Evaluation of alveolar bone is important in the diagnosis of dental diseases. The periodontal ligament space is difficult to clearly depict in cone-beam computed tomography images because the reconstruction filter conditions during image processing cause image blurring, resulting in decreased spatial resolution. We examined different reconstruction filters to assess their ability to improve spatial resolution and allow for a clearer visualization of the periodontal ligament space. MATERIALS AND METHODS: Cone-beam computed tomography projections of 2 skull phantoms were reconstructed using 6 reconstruction conditions and then compared using the Thurstone paired comparison method. Physical evaluations, including the modulation transfer function and the Wiener spectrum, as well as an assessment of space visibility, were undertaken using experimental phantoms. RESULTS: Image reconstruction using a modified Shepp-Logan filter resulted in better sensory, physical, and quantitative evaluations. The reconstruction conditions substantially improved the spatial resolution and visualization of the periodontal ligament space. The difference in sensitivity was obtained by altering the reconstruction filter. CONCLUSION: Modifying the characteristics of a reconstruction filter can generate significant improvement in assessments of the periodontal ligament space. A high-frequency enhancement filter improves the visualization of thin structures and will be useful when accurate assessment of the periodontal ligament space is necessary.
