下肢CTアンギオグラフィにおけるCT用自動露出機構(CT automaticexposure control system: CT-AEC)の最適化に関する検討：CNRを考慮したCT-AEC設定法の有用性について

DOI Web Site Web Site PubMed 参考文献13件
  • 稲田 智
    医療法人あかね会土谷総合病院診療技術部放射線室 現　県立広島病院放射線診断科
  • 舛田 隆則
    医療法人あかね会土谷総合病院診療技術部放射線室
  • 丸山 尚也
    医療法人あかね会土谷総合病院診療技術部放射線室 現　中電病院放射線科
  • 山下 由香利
    医療法人あかね会土谷総合病院診療技術部放射線室
  • 佐藤 友保
    医療法人あかね会土谷総合病院放射線科
  • 今田 直幸
    医療法人あかね会土谷総合病院診療技術部放射線室

書誌事項

タイトル別名
  • Study of CT Automatic Exposure Control System (CT-AEC) Optimization in CT Angiography of Lower Extremity Artery by Considering Contrast-to-Noise Ratio
  • カシ CT アンギオグラフィ ニ オケル CTヨウ ジドウ ロシュツ キコウ(CT automatic exposure control system: CT-AEC)ノ サイテキ カ ニ カンスル ケントウ : CNR オ コウリョ シタ CT-AEC セッテイホウ ノ ユウヨウセイ ニ ツイテ

この論文をさがす

抄録

Purpose: To evaluate the image quality and effect of radiation dose reduction by setting for computed tomography automatic exposure control system (CT-AEC) in computed tomographic angiography (CTA) of lower extremity artery. Methods: Two methods of setting were compared for CT-AEC [conventional and contrast-to-noise ratio (CNR) methods]. Conventional method was set noise index (NI): 14and tube current threshold: 10-750 mA. CNR method was set NI: 18, minimum tube current: (X+Y)/2 mA (X, Y: maximum X (Y)-axis tube current value of leg in NI: 14), and maximum tube current: 750 mA. The image quality was evaluated by CNR, and radiation dose reduction was evaluated by dose-length-product (DLP). Results: In conventional method, mean CNRs for pelvis, femur, and leg were 19.9±4.8, 20.4±5.4, and 16.2±4.3, respectively. There was a significant difference between the CNRs of pelvis and leg (P<0.001), and between femur and leg (P<0.001). In CNR method, mean CNRs for pelvis, femur, and leg were 15.2±3.3, 15.3±3.2, and 15.3±3.1, respectively; no significant difference between pelvis, femur, and leg (P=0.973) in CNR method was observed. Mean DLPs were 1457±434 mGy⋅cm in conventional method, and 1049±434 mGy·cm in CNR method. There was a significant difference in the DLPs of conventional method and CNR method (P<0.001). Conclusion: CNR method gave equal CNRs for pelvis, femur, and leg, and was beneficial for radiation dose reduction in CTA of lower extremity artery.

収録刊行物

参考文献 (13)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ