低管電圧CT 検査による被ばく低減効果の患者サイズ依存性

DOI
  • 成田 充穂
    国際医療福祉大学病院　放射線室 国際医療福祉大学大学院　保健医療学専攻　放射線・情報科学分野
  • 西木 雅行
    国際医療福祉大学大学院　保健医療学専攻　放射線・情報科学分野
  • 太田 智行
    国際医療福祉大学病院　放射線科

書誌事項

タイトル別名
  • Patient Size Dependency of Dose Reduction Efficiency with Low-kV CT

説明

<p>Though it is common practice to examine patients for abdominal CT with the tube voltage of 120 kV, there is an expectation that the same image quality could be achievable by adopting lower tube voltages such as 100 kV with reduced patient dose, based on the fact that the iodine contrast is higher with lower X-ray energies. If this is really the case,the dose reduction will depend on patient size too. Thus the purpose of this work was to investigate patient size dependency of dose reduction efficiency with low-kV CT. Under the approval of institutional review board, we compared abdominal scan images taken with 120 kV and 100 kV, 150 patients each, in terms of dose-weighted contrast to noise ratio (CNRD),since it is the value of not dependent on the mAs value applied. As for dose parameter, we adopted size specific dose estimate (SSDE) instead of volume CT dose index (CTDIvol) which is being used widely, since CTDIvol does not represent patient size dependency of dose correctly. As a result in terms of CNRD of liver and spleen contrast, 100 kV outperformed 120 kV with statistical significance throughout all the patient sizes investigated. The difference was size dependent, being larger with smaller patient size. </p>

収録刊行物

キーワード

詳細情報 詳細情報について

  • CRID
    1390288603144960512
  • NII論文ID
    130008062566
  • DOI
    10.11318/mii.38.101
  • ISSN
    18804977
    09101543
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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