This is the first study to evaluate the electron density value calculated from spectral data obtained using CZT-based PCD-CT. When the calculated values were compared with the nominal values, the electron density value was quantified with particularly high accuracy for materials with electron density value from about 3 to 5 (10^23 e/cm^3) and CT value from -200 to 400 HU. The results of the evaluation of four different tube currents of 50, 100, 200, and 250 mA showed that the standard deviation between the different tube currents were small, and the calculated values were highly correlated with the nominal values for each tube current condition, it was provided that the electron density value is dose independent.

The latest energy integrated detector CT incorporates deep learning technology applied to dual energy CT to improve image quality and quantitation. In PCD-CT, deep learning technology is also expected to further improve accuracy.