小照射野歯科用CT装置での患者被曝線量の検討  [in Japanese] Evaluation of Patient Dose in Imaging Using a Cone-beam CT for Dental Use  [in Japanese]

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Author(s)

    • 吉田 有里 YOSHIDA Yuri
    • 徳島大学大学院ヘルスバイオサイエンス研究部口腔顎顔面補綴学分野 Department of Oral and Maxillofacial Prosthodontics, Institute of Health Biosciences, The University of Tokushima
    • 誉田 栄一 HONDA Eiichi
    • 徳島大学大学院ヘルスバイオサイエンス研究部口腔顎顔面放射線医学分野 Department of Oral and Maxillofacial Radiology, Institute of Health Biosciences, The University of Tokushima
    • 友竹 偉則 TOMOTAKE Yoritoki
    • 徳島大学大学院ヘルスバイオサイエンス研究部口腔顎顔面補綴学分野 Department of Oral and Maxillofacial Prosthodontics, Institute of Health Biosciences, The University of Tokushima
    • 長尾 大輔 NAGAO Daisuke
    • 徳島大学大学院ヘルスバイオサイエンス研究部口腔顎顔面補綴学分野 Department of Oral and Maxillofacial Prosthodontics, Institute of Health Biosciences, The University of Tokushima
    • 市川 哲雄 ICHIKAWA Tetsuo
    • 徳島大学大学院ヘルスバイオサイエンス研究部口腔顎顔面補綴学分野 Department of Oral and Maxillofacial Prosthodontics, Institute of Health Biosciences, The University of Tokushima

Abstract

A limited cone-beam X-ray CT, known as Ortho-CT, was developed based on multi-functional panoramic apparatus and was improved as a "3DX multi-image micro CT (3DX)" for practical use. Recently, a new type of 3DX (3DX-FPD) having a flat panel detector instead of an image intensifier has been released. 3DX-FPD adopts two kinds of columnar radiation field, 40×40 mm (diameter×height) and 60×60 mm. Some investigations of the limited cone-beam CT apparatus including 3DX demonstrated high spatial resolution, however, different values were measured in a few surveys on dosimetry of 3DX. In addition, there has been no report on the dose of 3DX-FPD. Therefore, this study set out to estimate the dose difference among 3DX-FPD and other conventional radiographies (dental radiography, panoramic radiography and computed radiography (CT) and between two radiation fields in 3DX-FPD. Dosimetry of the organs and the tissues was performed using an anthropomorphic Alderson Rando phantom and a thermoluminescence dosimeter.<br/>The results are summarized as follows:<br/>1. The dose of 3DX-FPD was less than 7/10 of that of CT, however, it was more than 10 times that of dental radiography or several times that of panoramic radiography, respectively.<br/>2. The absorbed dose in a field of 60×60 mm for the contralateral mandibular molar, eye, parotid gland and skin regions was almost 2 times higher than that in 40×40 mm with 3DX-FPD.

Journal

  • Journal of Japanese Society of Oral Implantology

    Journal of Japanese Society of Oral Implantology 20(2), 280-286, 2007-06-30

    Japanese Society of Oral Implantology

References:  14

Cited by:  6

Codes

  • NII Article ID (NAID)
    10019575094
  • NII NACSIS-CAT ID (NCID)
    AN10072606
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09146695
  • Data Source
    CJP  CJPref  J-STAGE 
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