Improvement of the Visibility of Hepatocellular Carcinoma Lesions in Early Phase Abdominal Contrast Enhanced Computed Tomography Images: Utilization of Optimal Pseudo-Colorization

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  • AKAMINE Hiroshi
    Division of Radiology, Department of Medical Technology, Kyushu University Hospital Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University
  • MORISHITA Junji
    Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
  • KURAMOTO Taku
    Department of Radiological Technology, Faculty of Health Sciences, Kobe Tokiwa University
  • HAMASAKI Hiroshi
    Division of Radiology, Department of Medical Technology, Kyushu University Hospital
  • TAKARABE Shinya
    Division of Radiology, Department of Medical Technology, Kyushu University Hospital
  • WADA Noriaki
    Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
  • ISHIMATSU Keisuke
    Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
  • USHIJIMA Yasuhiro
    Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
  • KATO Toyoyuki
    Division of Radiology, Department of Medical Technology, Kyushu University Hospital
  • ISHIGAMI Kousei
    Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University
  • SASAKI Masayuki
    Department of Health Sciences, Faculty of Medical Sciences, Kyushu University

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Other Title
  • 腹部造影CT動脈相における肝細胞癌病変の視認性の向上：最適な疑似カラー画像化の利用

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Purpose : The specific objectives of our study were to examine whether the visibility of hepatocellular carcinoma (HCC) lesions on early phase abdominal contrast-enhanced computed tomography (CT) images can be improved by optimal pseudo-colorization with a rainbow color map. / Methods : The chromaticity of grayscale and rainbow color maps displayed on a medical liquid-crystal display was measured using a colorimeter. The differences in the chromaticity, bE00, between the HCC lesion and liver parenchyma in 22 cases were evaluated. The rainbow color map was revised by changing only the window level (WL) to match the HCC lesion with a peak of bE00. Visual evaluation of the 22 cases was performed using Scheffeʼs paired comparison by ten observers. The average psychological measurement (a) was calculated using the grayscale, rainbow color map, and revised rainbow color map to examine the effectiveness of the proposed method. / Results : In all cases, the a measure was highest in the order of revised rainbow, grayscale, and rainbow. These results indicate that the visibility of HCC lesions in early phase abdominal contrastenhanced CT images could be improved by modifying the pseudo-color map with optimal colorization based on bE00. / Conclusions : The visibility of HCC lesions in early phase abdominal contrast-enhanced CT images was improved by shifting only the WL setting so that the HCC contrast would match the pixel range with higher bE00 on the rainbow color map. This method can be applied to various cases and color maps, and the visibility of the target lesion can be easily improved.

Journal

  • 福岡醫學雜誌

    福岡醫學雜誌 113 (1), 7-17, 2022-03-25

    Fukuoka Medical Association

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