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Development and Validation of Generalized Linear Regression Models to Predict Vessel Enhancement on Coronary CT Angiography

  • Masuda, Takanori (Department of Radiological Technology, Tsuchiya General Hospital) ;
  • Nakaura, Takeshi (Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University) ;
  • Funama, Yoshinori (Department of Medical Physics, Faculty of Life Sciences, Kumamoto University) ;
  • Sato, Tomoyasu (Department of Diagnostic Radiology, Tsuchiya General Hospital) ;
  • Higaki, Toru (Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University) ;
  • Kiguchi, Masao (Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University) ;
  • Matsumoto, Yoriaki (Department of Radiological Technology, Tsuchiya General Hospital) ;
  • Yamashita, Yukari (Department of Radiological Technology, Tsuchiya General Hospital) ;
  • Imada, Naoyuki (Department of Radiological Technology, Tsuchiya General Hospital) ;
  • Awai, Kazuo (Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University)
  • Received : 2018.01.17
  • Accepted : 2018.04.24
  • Published : 2018.12.01

Abstract

Objective: We evaluated the effect of various patient characteristics and time-density curve (TDC)-factors on the test bolus-affected vessel enhancement on coronary computed tomography angiography (CCTA). We also assessed the value of generalized linear regression models (GLMs) for predicting enhancement on CCTA. Materials and Methods: We performed univariate and multivariate regression analysis to evaluate the effect of patient characteristics and to compare contrast enhancement per gram of iodine on test bolus (${\Delta}HUTEST$) and CCTA (${\Delta}HUCCTA$). We developed GLMs to predict ${\Delta}HUCCTA$. GLMs including independent variables were validated with 6-fold cross-validation using the correlation coefficient and Bland-Altman analysis. Results: In multivariate analysis, only total body weight (TBW) and ${\Delta}HUTEST$ maintained their independent predictive value (p < 0.001). In validation analysis, the highest correlation coefficient between ${\Delta}HUCCTA$ and the prediction values was seen in the GLM (r = 0.75), followed by TDC (r = 0.69) and TBW (r = 0.62). The lowest Bland-Altman limit of agreement was observed with GLM-3 (mean difference, $-0.0{\pm}5.1$ Hounsfield units/grams of iodine [HU/gI]; 95% confidence interval [CI], -10.1, 10.1), followed by ${\Delta}HUCCTA$ ($-0.0{\pm}5.9HU/gI$; 95% CI, -11.9, 11.9) and TBW ($1.1{\pm}6.2HU/gI$; 95% CI, -11.2, 13.4). Conclusion: We demonstrated that the patient's TBW and ${\Delta}HUTEST$ significantly affected contrast enhancement on CCTA images and that the combined use of clinical information and test bolus results is useful for predicting aortic enhancement.

Keywords

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