Application of low-tube current using adaptive statistic iterative reconstruction in the accuracy of spinal quantitative CT
10.3760/cma.j.issn.0254-5098.2018.01.013
- VernacularTitle:低管电流联合多模型迭代重建技术对腰椎定量CT准确度的应用价值
- Author:
Yaojun JIANG
1
;
Yan WU
;
Yonggao ZHANG
;
Junqiang DONG
;
Jie LIU
;
Ping HOU
;
Jianbo GAO
Author Information
1. 450052,郑州大学第一附属医院放射科
- Keywords:
Quantitative CT;
Bone mineral density;
X-ray computed;
Radiation dosage;
Iterative reconstruction
- From:
Chinese Journal of Radiological Medicine and Protection
2018;38(1):59-63
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the reproducibility and accuracy of spinal BMD (bone mineral density) by low mA using adaptive statistic iterative reconstruction based on phantom model.Methods European spine phantom (ESP) was scanned with 5 different tube currents (40,60,80,100 and 120 mA) on the GE Revolution prototype.All data were transferred to the quantitative CT (QCT) PRO workstation for measuring the bone mineral density (BMD).And all data were reconstructed using different adaptive statistical iterative reconstruction veo (ASiR-V) weighting percentages from ASiR-V 0 filtered back projection(FBP) to ASiR-V 100％,at interval of 20％.Quantitative measurements of CT value,noise,and contrast noise ratio (CNR) of L1,L2 and L3 were measured in each group.The singlefactor analysis of variance (ANOVA) was used to compare the bone mineral density values of different mA and ASiR-V weighting percentages.Results Volume CT dose index(CTDIvol) and dose length product (DLP) were positively correlated with tube current(r =1).The BMD of ESP phantoms had no statistically significant differences among the multi-center lumbar spines L1,L2 and L3 at different doses under the same ASiR-V weighting percentages (P ＞ 0.05),as well as at the same dose under different ASiR-V weighting percentages(P ＞ 0.05).The error of bone density accuracy was within 6％.Conclusions Low dosage of 120 kV and 40 mA using ASiR-V without affecting the accuracy of BMD has the potential effect to reduce radiation dose without compromising image quality.
