Impact of prescribed adaptive statistical iterative reconstruction-V on image quality and radiation dosage of lung pure ground glass nodules: A phantom study
10.13929/j.1003-3289.201708090
- VernacularTitle:前置自适应统计迭代重建技术对体模肺纯磨玻璃结节图像质量及辐射剂量的影响
- Author:
Ying LI
1
;
Na'na AI
;
Yingying ZHANG
;
Yucun FU
;
Jiong JIANG
;
Dandan NIU
;
Yanhui ZHAI
;
Shouqiang JIA
Author Information
1. 泰山医学院附属莱芜医院影像科
- Keywords:
Tomography,X-ray computed;
Noise;
Image quality;
Radiation dosage;
Adaptive statistical iterative reconstruction
- From:
Chinese Journal of Medical Imaging Technology
2018;34(5):775-778
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the impact of prescribed adaptive statistical iterative reconstruction V (Pre-ASiR-V) on imaging quality and radiation dosage of pure ground glass nodules (pGGN) in chest phantom,in order to obtain the optimal level of Pre-ASiR-V.Methods CT scanning for a chest phantom containing 4 artificial pGGNs was performed with Revolution CT,and the Pre-ASiR-V level was set as 0,20％,40％,60％,80％ and 100％ group,respectively.The mean noise,effective dose (ED) and the subjective scores of pGGN imaging were recorded and compared.Results The mean noise of groups (Pre-ASiR-V 0,20％,40％,60％,80％ and 100％) was (17.93±2.20)HU,(17.30±3.68)HU,(18.20± 3.44)HU,(18.80±0.20)HU,(19.87±2.56)HU and (15.90±4.56)HU,respectively (F=0.568,P=0.723).ED of these groups was 7.40 mSv,5.16 mSv,3.36 mSv,1.97 mSv,0.97 mSv and 0.33 mSv,respectively.Compared with imaging of PreASiR-V 0,the reduction percentage of ED was 30.27％,54.59％,73.38％,86.89％ and 95.54％,respectively.The subjective score of the image quality evaluated by the 2 observers had high agreement (Kappa=0.778,P=0.003),and all the scores were greater than 3.The subjective score of Pre-ASiR-V 80％ and 100％ group was slightly lower than those in other groups.Conclusion Different Pre-ASiR-V level slightly impacts the noise of high-resolution CT images of chest phantom,while reduces radiation dosage significantly.Pre-ASiR-V level of 60％ is the optimal protocol.
