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Detection of Recurrent Hepatocellular Carcinoma in Cirrhotic Liver after Transcatheter Arterial Chemoembolization: Value of Quantitative Color Mapping of the Arterial Enhancement Fraction of the Liver

  • Lee, Dong Ho (Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine) ;
  • Lee, Jeong Min (Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine) ;
  • Klotz, Ernst (Siemens Medical Solutions) ;
  • Kim, Soo Jin (Department of Radiology, National Cancer Center) ;
  • Kim, Kyung Won (Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine) ;
  • Han, Joon Koo (Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine) ;
  • Choi, Byung Ihn (Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine)
  • Published : 2013.02.01

Abstract

Objective: To investigate the additional diagnostic value of color mapping of the hepatic arterial enhancement fraction (AEF) for detecting recurrent or residual hepatocellular carcinoma (HCC) in patients treated with transcatheter arterial chemoembolization (TACE). Materials and Methods: Seventy-six patients with 126 HCCs, all of whom had undergone previous TACE, and subsequently, underwent follow-up multiphasic liver CT scans, were included in this study. Quantitative color maps of the AEF of the whole liver were created, by using prototype software with non-rigid registration. The AEF was defined as the ratio of the attenuation increment during the arterial phase to the attenuation increment during the portal phase. Two radiologists independently analyzed the two image sets at a two-week interval, i.e., the multiphasic CT image set and the second image set of the AEF color maps and the CT images. The additional diagnostic value of the AEF color mapping was determined, by the use of the jackknife-alternative free-response receiver-operating-characteristic analysis. The sensitivity and positive predictive values for detecting HCCs of each image set were also evaluated and compared. Results: The reader-averaged figures of merit were 0.699 on the initial interpretation of the MDCT image set, and 0.831 on the second interpretation of the combined image set; the difference between the two interpretations was significant (p value < 0.001). The mean sensitivity for residual or recurrent HCC detection increased from 62.7% on the initial analysis to 82.1% on the second analysis using the AEF color maps (p value < 0.001). The mean positive predictive value for HCC detection was 74.5% on the initial analysis using MDCT, and 71.6% on the second analysis using AEF color mapping. Conclusion: Quantitative color mapping of the hepatic AEF may have the possibility to increase the diagnostic performance of MDCT for the detection of recurrent or residual HCC without the potential risk of radiation-related hazards.

Keywords

References

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