巻号一覧
52 巻 (2012)
- 4 号 p. 47-
- 3 号 p. 35-
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52 巻, 4 号
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原著
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犬飼 啓介, 飯田 幸弘, 勝又 明敏, 永原 國央2012 年 52 巻 4 号 p. 47-60
発行日: 2012年
公開日: 2013/03/11
ジャーナル フリーObjective: The magnification factor of panoramic radiography varies, so this approach is not suitable for measurement of distance, angle, and area. The purpose of the present study was to develop a semi-anatomical phantom that provides the magnification factor for the evaluation of digital panoramic X-ray images.
Materials and Methods: The CT image data from a full-scale plaster model of the skull were used with the rapid prototyping technique using the binder jet method. A sheet-type metal mesh with a 1-mm scale was embedded in the plaster model. A 10 × 10-mm copper plate was bound to the upper and lower anterior and molar tooth areas and the buccolingual bone surface of the mandibular ramus to complete the phantom. A semiconductor detector-type and an imaging plate (IP)-type digital panoramic system was used. The standard positioning based on the canine, midline, and horizontal light beam was applied for the first image, and the phantom was moved anteroposteriorly by 5 mm and horizontally by 10 mm, tilted vertically by 5 and 10 degrees, and rotated by 5 and 10 degrees to take another image. The sizes of the mesh and the copper plate were measured using image software (Osiri X), and the vertical and horizontal magnification factors were calculated on the basis of the actual size.
Results: Regarding the effects of the positional change of the patient's head on the linear measurement, it was revealed that the horizontal dimension had greater effects than the vertical dimension. Changes of the magnification factor of the copper plates attached to the bone surface were larger than those of the mesh embedded in the upper and lower jaws. There were no major differences in the magnification factor among different panoramic machines.
Conclusion: A special semi-anatomical phantom that could be used to evaluate the magnification profile of a panoramic image using the anatomical structure and area in the dentition was developed.抄録全体を表示PDF形式でダウンロード (1746K) -
小日向 謙一, 内藤 智浩, 大森 桂一, 金子 正範, 佐藤 隆文, 山野 茂, アラム モハンマド トウフィック, 中村 太保2012 年 52 巻 4 号 p. 61-65
発行日: 2012年
公開日: 2013/03/11
ジャーナル フリーPurpose: This study surveyed plain X-ray radiography and diagnostic reporting by dental radiologists at the Center for Dental Clinics of Hokkaido University Hospital, and also access to PACS in the hospital.
Materials and Methods: We analyzed the image modalities, the number of images ordered by each department, and the times and days taken to complete diagnostic reporting by dental radiologists for plain X-ray radiographs taken between June 2010 and May 2011. Access to PACS was also analyzed and compared between the period of this study and before the initiation of filmless and registry of diagnostic reports.
Results: The total number of images was 8271, and the most common modality was panoramic radiography (77%), followed by cephalography (11.3%), and posterior-anterior and lateral, axial projections (6.3%); there were also lateral oblique transcranial projections (Schüller), Waters projections, and panagraphy. The Department of Oral Surgery and Oral Medicine ordered the most images (approximately 60%). The average number of radiograph image diagnoses per dental radiologist was 30.2. The average time and number of days to complete diagnostic reports were 171.4 minutes and 7.4 days, respectively, with an achievement rate of reporting of 97.8%. Access to PACS at the Center for Dental Clinics for all departments has increased since filmless and registry of diagnostic reports were initiated. In addition, the Departments of Restorative, Periodontal, and Prosthetic Dentistry have accessed PACS about tenfold more since intraoral radiography was digitalized.
Conclusion: Dental radiologists need to institute checks to prevent missing reports and also make efforts to complete reporting in the shortest possible time.抄録全体を表示PDF形式でダウンロード (695K)
資料
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岡野 友宏, 西川 慶一, 杉原 義人, 遠藤 敦, 三島 章2012 年 52 巻 4 号 p. 66-74
発行日: 2012年
公開日: 2013/03/11
ジャーナル フリー歯科領域における放射線医療機器の安全確保のために，歯科用X線撮影装置の管理の適正化に関わる事項を整理し，装置の点検項目を設定した。薬事法における歯科用X線撮影装置の分類，その認証基準について現行と新規IEC規格に沿った基準を示した。その基準に沿って，定期点検と日常点検で確認すべき項目を提案したが，点検時期に応じた点検内容については，実際に運用してその適切さを検討する必要がある。抄録全体を表示PDF形式でダウンロード (422K)
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