Image quality and radiation dose with low tube voltage in coronary CT angiography: an experimental study with normal type and soft plaque phantom

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  • Osanai Minoru
    Department of Radiological Life Sciences, Division of Medical Life Sciences, Hirosaki University Graduate School of Health Sciences
  • Saito Yoko
    Department of Radiological Life Sciences, Division of Medical Life Sciences, Hirosaki University Graduate School of Health Sciences
  • Oyu Kazuhiko
    Department of Bioimage Analysis, Division of Bioinformation Sciences, Hirosaki University Graduate School of Health Sciences
  • Ishida Junichi
    Department of Bioimage Analysis, Division of Bioinformation Sciences, Hirosaki University Graduate School of Health Sciences
  • Sato Mitsue
    Department of Bioimage Analysis, Division of Bioinformation Sciences, Hirosaki University Graduate School of Health Sciences
  • Sasaki Taisuke
    Department of Radiology, Aomori PET Diagnostic Imaging Center

Bibliographic Information

Other Title
  • 冠状動脈CTにおける低電圧撮影の画質と被曝線量～正常モデルおよびソフトプラークモデルにおける検討～
  • IMAGE QUALITY AND RADIATION DOSE WITH LOW TUBE VOLTAGE IN CORONARY CT ANGIOGRAPHY : AN EXNERIMENTAL STUDY WITH NORMAL TYPE AND SOFT PLAQUE PHANTOM

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Description

We evaluated the effect of tube voltage and tube current on image quality and radiation dose in coronary computed tomography angiography (CCTA) with phantom. The phantom was constituted with ball and tubes, both filled with diluted contrast medium (ball: 120HU, tube: 300, 350 and 400HU). The phantom was scanned at 120kV, 100kV and 80kV with beating at 70bpm. The tube currents were changed from 300 to 400mA with every 25mA. Contrast-to-noise ratio (CNR) was calculated. We also performed assessment of image quality, especially noise and sharpness. The radiation dose was also evaluated. The CT numbers at 100kV and 80kV were 1.18~1.37 and 1.49~1.71-times higher than those at 120kV with normal type phantom. There was no significant difference in CNR between 120kV and 100kV. At 80kV both CNR and image score were lower than others. The contrast of tube and soft plaque were also evaluated, and those at 100kV and 120kV were almost same. Compared with 120kV, radiation dose decreased to about 60% and 30% at 100kV and 80kV respectively. In conclusion, with 100kV setting the radiation dose could be reduced without degradation of image quality, and it is suggested that low tube voltage technique is also useful in CCTA.

Journal

  • Hirosaki Medical Journal

    Hirosaki Medical Journal 64 (1), 15-28, 2013

    Hirosaki University Graduate School of Medicine,Hirosaki Medical Society

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