Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Detailed profile of sinogram after dark current subtraction in each processing step. The sinogram was generated with CT technique of 1 mA, 120 kVp, 0.5 mm Cu filtration. The sinogram was smoothed by a 5 × 5 boxcar, followed by ATM smoothing and zero clipping. Note the x- and y-axis scale changes. The dashed line is the reference noise-free CT sinogram profile for comparison.
