Effect of advanced modeled iterative reconstruction in different strength levels on image quality under different noise: A phantom study
10.13929/j.1003-3289.201812108
- Author:
Yuanding WANG
1
Author Information
1. Department of Radiology, Peking University International Hospital
- Publication Type:Journal Article
- Keywords:
Image quality;
Interative reconstruction;
Phantom;
Tomography, X-ray computed
- From:
Chinese Journal of Medical Imaging Technology
2019;35(6):914-919
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To evaluate the effect of advanced modeled iterative reconstruction (ADMIRE) with different strength levels on image quality in two sets of noise levels using the Catphan 500 phantom and modified collar phantom. Methods: Standard phantom (standard phantom group) and collar phantom (collar phantom group) were scanned under 12 different scanning conditions. All images were reconstructed using filtered back projection (FBP; ADMIRE 0 subgroup) and different strength levels ADMIRE 1-5 ( ADMIRE 1-5 subgroups). The noise, SNR, spatial resolution and density resolution of the images were measured and evaluated. Results: In standard phantom group, with the increase of iterative strength levels, the noise gradually decreased, the SNR gradually increased, the spatial resolution did not obviously change, and the density resolution gradually increased; the density resolution in ADMIRE 4, 5 subgroups were higher than that in ADMIRE 0-2 subgroups (all P<0.05). In collar phantom group, with the increase of iterative strength levels, the noise gradually decreased, SNR gradually increased, and the spatial resolution in ADMIRE 4, 5 subgroups were lower than in ADMIRE 0-2 subgroups; the density resolution gradually increased, and in ADMIRE 3-5 subgroups was higher than in ADMIRE 0-2 subgroups (all P<0.05). Conclusion: On condition of standard phantom noise level, ADMIRE technology improves density resolution while does not reduce spatial resolution. On condition of collar phantom noise level, ADMIRE technology improves density resolution, but high strength levels ADMIRE technology will reduce spatial resolution. ADMIRE 3 is recommended as the optimal strength level.
