Table 2: The quantitative estimations of the reconstruction results of the cylinder phantom.

MethodRMSEIteration numberTime (s)

Noiseless PPFC 1031.2
Noiseless PICCS 10034.3
Noisy PPFC 1031.2
Noisy PICCS 10034.4

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.