Optimizing the reconstruction filter in cone-beam CT to improve periodontal ligament space visualization: An in vitro study
Houno Yuuki, Hishikawa Toshimitsu, Gotoh Ken-ichi, Naitoh Munetaka, Mitani Akio, Noguchi Toshihide, Ariji Eiichiro, Kodera Yoshie,
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( Houno Yuuki ) - Nagoya University Graduate School of Medicine
( Hishikawa Toshimitsu ) - Aichi Gakuin University School of Dentistry Department of Periodontology
( Gotoh Ken-ichi ) - Aichi Gakuin University Dental Hospital Division of Radiology
( Naitoh Munetaka ) - Aichi Gakuin University School of Dentistry Department of Oral and Maxillofacial Radiology
( Mitani Akio ) - Aichi Gakuin University School of Dentistry Department of Periodontology
( Noguchi Toshihide ) - Aichi Gakuin University School of Dentistry Department of Periodontology
( Ariji Eiichiro ) - Aichi Gakuin University School of Dentistry Department of Oral and Maxillofacial Radiology
( Kodera Yoshie ) - Nagoya University Graduate School of Medicine
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.
키워드
Cone-Beam Computed Tomography; Image Processing; Computer-Assisted; Phantoms; Imaging; Periodontal Ligament
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