Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems

• Material Type: 博士論文
• Title: Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems
• Author/Editor: Dashpuntsag, Oyunbat; Yoshida, Midori; Kasai, Ryosuke; Maeda, Naoki; Hosoki, Hidehiko; Honda, Eiichi
• Author Heading: Dashpuntsag, Oyunbat; Yoshida, Midori; Kasai, Ryosuke; Maeda, Naoki; Hosoki, Hidehiko; Honda, Eiichi
• Publication, Distribution, etc.: Hindawi
• Publication Date: 2017-04-09
• Publication Date (W3CDTF): 2017-04-09
• Alternative Title: 現行の口内法デジタルX線撮影システム間の薄い対象物及び厚い対象物におけるコントラストの違いの評価
• Periodical title: BioMed Research International
• No. or year of volume/issue: 2017
• Volume: 2017
• Pages: 5215413-
• ISSN (Periodical Title): ISSN : 2314-6133; ISSN : 2314-6141
• Degree grantor/type: 徳島大学
• Date Granted: 2018-03-23
• Dissertation Number: 甲第3181号
• Degree Type: 博士（学術）
• Text Language Code: eng
• Subject Heading: Digital Imaging System; PSP; CCD
• Target Audience: 一般
• Note (General): The purpose is to evaluate the performance of current intraoral digital detectors in detail using a precise phantom and new method. Two aluminum step wedges in 0.5 mm steps were exposed by two photostimulable phosphor plate (PSP) systems—one with automatic exposure compensation (AEC) and the other without AEC—and a CCD sensor. Images were obtained with 3 doses at 60 kV. The effect of metallic material also was evaluated. The contrast-to-noise ratio (CNR) for thinner steps and the low contrast value (LCV) for thicker steps were obtained. The CCD system was the best under all conditions (𝑃 < 0.001), although the Gray value was sensitive to the dose, and the Gray value-dose relation varied greatly. The PSP system with AEC was superior to that without AEC for the LCV (𝑃 < 0.001) but was inferior to it regarding the CNR (𝑃 < 0.001). CNR and LCV in the PSP system without AEC were not affected by the metallic plate. Intraoral digital imaging systems should be chosen according to their diagnostic purpose. PSP system with AEC may be the best for detecting molar proximal caries, whereas the PSP system without AEC may be better for evaluating small bone regeneration in periodontal disease. The CCD system provided the best performance.
• Format (IMT): application/pdf
• Access Restrictions: インターネット公開
• Rights (production): Copyright © 2017 Oyunbat Dashpuntsag et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.( https://creativecommons.org/licenses/by/4.0/ )
• Related Material (DOI): 10.1155/2017/5215413
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 徳島大学 : 徳島大学機関リポジトリ

Table of Contents

http://repo.lib.tokushima-u.ac.jp/files/public/11/112388/20190828110115832254/k3181_abstract.pdf fulltext

http://repo.lib.tokushima-u.ac.jp/files/public/11/112388/20190828110116425155/k3181_review.pdf fulltext

http://repo.lib.tokushima-u.ac.jp/files/public/11/112388/20190828110116924989/k3181_fulltext.pdf fulltext