A Pilot Study of Contrast Medium Dose Reduction Using Low Tube Voltage and Iterative Reconstruction: Computed Tomography Angiography of the Head

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  • Ihara Riku
    Department of Health Sciences, School of Medicine, Hokkaido University
  • Itou Kouhei
    Department of Radiology, Abashiri Neurosurgical Rehabilitation Hospital
  • Terashita Takayoshi
    Faculty of Health Sciences, Hokkaido University
  • Fuse Yoshihiro
    Department of Radiology, Abashiri Neurosurgical Rehabilitation Hospital

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Other Title
  • 低管電圧撮影，および逐次近似応用画像再構成法を利用した造影剤減量の試み：頭部CTA を対象として
  • 臨床技術 低管電圧撮影,および逐次近似応用画像再構成法を利用した造影剤減量の試み : 頭部CTAを対象として
  • リンショウ ギジュツ テイカン デンアツ サツエイ,オヨビ チクジ キンジ オウヨウ ガゾウ サイコウセイホウ オ リヨウ シタ ゾウエイザイ ゲンリョウ ノ ココロミ : トウブ CTA オ タイショウ ト シテ

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Abstract

This study aimed to reduce contrast medium dose without reducing the diagnostic capability of computed tomography (CT) angiography of the head. We evaluated the advanced statistical iterative reconstruction (ASiR) settings to adjust to low tube voltage CT. A syringe phantom was constructed using dilute contrast medium and was imaged at tube voltages of 80–120 kV. The iodine volumes, CT values, and image noise were measured in these images. The noise-power spectrum and modulation transfer function were measured from quality assurance phantom images that had been obtained using the tube voltage selected after considering the image noise results as described above and reconstructed using different ASiR rate settings and convolution kernels. Our results suggested that imaging at 100 kV could reduce the contrast medium dose by 14%, compared with imaging at 120 kV, and that the resulting image quality could equal that of conventional imaging by performing reconstruction at a 40% ASiR rate and detail kernel.

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