Accuracy of an Automated FOV Adjustment System for Dental CBCT

DOI
  • Kaku Akiko
    Department of Oral Radiology, Division of Oral Pathogenesis and Disease Control, Asahi University School of Dentistry Department of Orthodontics, Division of Oral Structure, Function and Development, Asahi University School of Dentistry
  • Murabayashi Manabu
    Department of Orthodontics, Division of Oral Structure, Function and Development, Asahi University School of Dentistry
  • Shimizu Ichiro
    Department of Oral Radiology, Division of Oral Pathogenesis and Disease Control, Asahi University School of Dentistry
  • Sezaki Yusuke
    Department of Oral Radiology, Division of Oral Pathogenesis and Disease Control, Asahi University School of Dentistry
  • Kitai Noriyuki
    Department of Orthodontics, Division of Oral Structure, Function and Development, Asahi University School of Dentistry
  • Katsumata Akitoshi
    Department of Oral Radiology, Division of Oral Pathogenesis and Disease Control, Asahi University School of Dentistry

Bibliographic Information

Other Title
  • パノラマ画像三次元マッピング法を応用したCBCT撮影FOV自動調整機能の精度

Search this article

Abstract

Purpose: Application of small field of view (FOV) is effective to reduce radiation exposure indental cone-beam CT (CBCT). However, it is not easy to depict objective teeth in aFOV of 40-50mm in diameter. Therefore an automated FOV adjustment system basedon the panoramic radiography 3D mapping technique was developed. We evaluated thereproducibility of the FOV in objects with various head position.<br>Materials and method: A head phantom especially designed for panoramic radiography was used as an objectto be imaged. A hybrid x-ray imaging system combining digital panoramic radiographywith CBCT (QR-master H/Revo) was used. This system equiped a FOV adjustmentsystem. In the FOV adjustment system, at first a panoramic radiography was taken as ascout image. In the panoramic image, when a dentist chooses a position to be imaged, athree-dimentional position of a FOV with 50mm in diameter and 45mm in height wasdefined automatically. Panoramic radiograph and CBCT were obtained in various headposition. The reproducibility of the FOV adjustment system was evaluated in themaxillary anterior region.<br>Results and conclusion: The depiction of objective teeth in CBCT was stable when the position of head phantomshifted toward bilaterally. Objective teeth were protruded from FOV when the positionof phantom shifted anteroposterior direction widely. Widely vertical tilting of head alsoaffected the reproducibility of FOV. It was suggested that the FOV adjustment systemrevealed high reproducibility as far as the position of patient’s head was setappropriately.

Journal

  • Shika Hoshasen

    Shika Hoshasen 56 (1), 33-38, 2016

    Japanese Society for Oral and Maxillofacial Radiology

Keywords

Details 詳細情報について

Report a problem

Back to top