Effects of different weighted iterative algorithms on abdominal energy spectrum parameters in dual-shot spectral CT scanning mode
Objective To investigate the effects of different weighted iterative algorithms on abdominal spectral images in dual-energy spectral CT scanning mode in terms of single energy,effective atomic number and basis material pairs.Methods Prospective collection of 20 patients undergoing abdominal CT scans using a novel dual-energy spectral scanning mode with simultaneous current and voltage.The GSI Viewer spectral analysis software was applied to delineate regions of interest in the liver and other areas on portal phase images at the same level,obtaining CT values and noise for effective atomic number,basis material pairs images,and 74keV mo-noenergetic images in each ROI,and calculating signal-to-noise ratio.Results In 20 patients,as the ASiR-V weight increased,there were no significant statistical differences in the effective atomic number,basis material pairs values,and 74keV monoenergetic image CT values(P＞0.05);the standard deviation values of the images gradually decreased,indicating an improvement in quality.Different weights of ASiR-V had similar effects on the effective atomic number,basis material pairs values,and 74keV monoenergetic images.Conclusion Based on the new dual-energy spectral scanning mode,different weight iterative algorithms can optimize the image quality of effective atomic number similar to that of 74keV single-energy images.
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