Keywords:
Performed at one institution, Experimental, Prospective, Quality assurance, Artifacts, Technology assessment, CT, Radiation physics, Physics in Medical Imaging
Authors:
D. Semenov, K. Akhmad, Y. Vasilev, K. Sergunova, S. Morozov, A. Vladzymyrskyy; Moscow/RU
DOI:
10.26044/ecr2020/C-09436
Results
Several studies showed an increase in the quality of images when applying methods of artifacts reduction in some special cases [2,3,4]. The developed phantom allowed us to obtain the following results.
There was no visible distortion on images without metal. A visual assessment of the MAR-processed images with a rod showed significant smoothing of the radial artifacts. Numerical analysis showed a bias of mean values within 9% for 140 kV and 5.5% for DE (stainless rod, 300 mg/cm3). For copper and aluminum rods, the mean intensity was not significantly influenced by the algorithm.
The results on the inner and outer rows of the tubes did not differ.
After MAR-processing, SD for cases with aluminum and copper rods decreased to 55% (aluminum rod, test tube 200 mg / cm3), but, however, it increased for a tube with a concentration of 300 mg / cm3.
In addition, quantitative analysis showed a significant increase in noise in all MAR-processed images for the stainless-steel rod and test tubes with K2HPO4 concentration of 300 mg/cm3 (by 516% for 140 kV and 450% for DE).