Comparison of a Dental Cone Beam CT with a Multi-detector Row CT on Effective Doses and Physical Image Quality

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  • Yoshida Yutaka
    Department of Medical Technology, Kyushu University Hospital
  • Tokumori Kenji
    Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Kyushu University
  • Okamura Kazutoshi
    Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Kyushu University
  • Yoshiura Kazunori
    Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Kyushu University

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Other Title
  • 実効線量と画像の物理特性による歯科用コーンビームＣＴとｍｕｌｔｉ－ｄｅｔｅｃｔｏｒ　ｒｏｗ　ＣＴの比較
  • ジッコウセンリョウ ト ガゾウ ノ ブツリ トクセイ ニ ヨル シカヨウ コーンビーム CT ト multi detector row CT ノ ヒカク

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The purpose of this study was to compare a dental cone beam computed tomography (dental CBCT) and a multi-detector row CT (MDCT) using effective doses and physical image quality. A dental mode (D-mode) and an implant mode (I-mode) were employed for calculating effective doses. Field of view (FOV) size of the MDCT was 150 mm. Three types of images were obtained using 3 different reconstruction functions: FC1 (for abdomen images), FC30 (for internal ear and bone images) and FC81 (for high resolution images). Effective doses obtained with the D-mode and with the I-mode were about 20% and 50% of those obtained with the MDCT, respectively. Resolution properties obtained with the D-mode and I-mode were superior to that of the MDCT in a high frequency range. Noise properties of the D-mode and the I-mode were better than those with FC81. It was found that the dental CBCT has better potential as compared with MDCT in both dental and implant modes.

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