Reproducibility and Risk Factors of Aortic Distensibility Quantification in Abdominal Aortic Aneurysm Using Multi-slice Spiral CT
10.3969/j.issn.1005-5185.2017.10.014
- VernacularTitle:多层螺旋CT定量评估腹主动脉瘤弹性的可重复性及风险因素
- Author:
Shanliang HAN
1
;
Liang LI
;
Yuan LIN
;
Jiao WANG
;
Xuesong LU
;
Wei GONG
;
Dong XING
;
Yunfei ZHA
Author Information
1. 武汉大学人民医院放射科 湖北武汉430060
- Keywords:
Aortic aneurysm,abdominal;
Tomography,spiral computed;
Elasticity;
Risk factors
- From:
Chinese Journal of Medical Imaging
2017;25(10):767-771
- CountryChina
- Language:Chinese
-
Abstract:
Purpose To investigate the reproducibility and risk factors of aortic distensibility quantification in patients with abdominal aortic aneurysm using multi-slice spiral CT.Materials and Methods The abdominal aortic computed tomography angiography data of 54 patients with infrarenal abdominal aortic aneurysm were prospectively studied.64-muti detector spiral CT,retrospective ECG-gating and segment data collecting scanning were all carried out.The aortic distensibility,D value,and pulse wave velocity at renal artery level and infrarenal artery level were calculated using semiautomatic segmentation software.The difference of aortic distensibility at different levels was compared,and consistency test was performed.Results The D value at renal artery level and infrarenal artery level of abdominal aortic aneurysm was (1.05 ±0.22)×10-5/Pa and (0.49± 0.18)× 10-5/Pa,respectively;and the corresponding pulse wave velocity was (9.68± 1.09) m/s and (14.96 ±4.01) m/s,respectively.The intraclass correlation coefficient of intra-and interobserver at renal level was 0.92 and 0.79,while it was 0.85 and 0.79 at inffa level.The Bland-Altman graph showed that the vast majority of points were within the 95％ CI,the difference of intraobserver between the two positions was 0.017×105/pa and 0.010×10-5/Pa,and the difference of interobserver was 0.013×105/Pa and 0.018×10-5/Pa.Multivariate analysis of all these variables showed aortic distensibility to be independently correlated to body mass index,pulse pressure,diastolic pressure and abdominal aortic aneurysm diameter (R2=0.68).Conclusion The quantification of aortic distensibility using multi-slice spiral in patients with abdominal aortic aneurysm shows high stability.Taking into consideration of the relationship between different risk factors and the incidence of abdominal aortic aneurysm can lead to a better clinical approach.
