Fig 1.
ROI size and location in the monochromatic images at 40keV.
Table 1.
Patient characteristics.
Fig 2.
Parallel boxplots and scatter plot of monochromatic images at 40keV and 100keV.
Table 2.
Comparison of measurements in spectral CT between benign and malignant pleural effusion.
Fig 3.
The spectral slope curve of benign pleural effusion and malignant pleural effusion.
Fig 4.
Receiver operating characteristic curve for factors (combine age, disease history, effective atomic number, monochromatic images at 40keV and 100keV) in differentiating benign pleural effusion from malignant pleural effusion (sensitivity of 100% and specificity of 71.4% with area-under-curve of 0.933).
Table 3.
The diagnostic performance of the age,disease history,CT value in 40keV, 100kev and effective atomic number to differentiate between benign and malignant pleural effusion.