Prior Image Guided Undersampled Dual Energy Reconstruction with Piecewise Polynomial Function Constraint

Table 2

The quantitative estimations of the reconstruction results of the cylinder phantom.

Method	RMSE	Iteration number	Time (s)
Noiseless PPFC	2.9×10^−4	10	31.2
Noiseless PICCS	4.8×10^−4	100	34.3
Noisy PPFC	2.9×10^−4	10	31.2
Noisy PICCS	8.7×10^−4	100	34.4

The RMSE is calculated by comparing to the noiseless result of FBP.
The iterations numbers do not include the 10 times pre-iterations and are enough for convergence.
The code is implemented by C++ on a machine with Intel Core i5 processor and 3 GB memory.