Feasibility of gemstone spectral CT in imaging pulmonary angiography with 35 mL low dose contrast medium
10.3969/j.issn.1002-1671.2014.06.033
- VernacularTitle:宝石能谱 CT 低对比剂量肺动脉造影的可行性研究
- Author:
Wei XIA
;
Yongjian WU
;
Xiaorui YIN
;
Yuan ZHOU
;
Zhijun WANG
- Publication Type:Journal Article
- Keywords:
gemstone spectral CT;
pulmonary angiography;
low contrast medium dos
- From:
Journal of Practical Radiology
2014;(6):1021-1025
- CountryChina
- Language:Chinese
-
Abstract:
Objective To probe the feasibility of gemstone spectral CT in imaging pulmonary angiography with low dose contrast medium.Methods A prospective study with multi-slice spiral CT pulmonary angiography was performed in consecutive 48 patients suspected with pulmonary embolism.Two groups (n=24 respectively)were divided at random including Group A used Gemstone spectral CT with 35 mL of contrast medium and Group B using 64-slice CT with conventional 80~90 mL of contrast medium.The CT values of the pulmonary trunk,lobe artery,pulmonary vein and ascending aorta were measured.The contrast to noise ratio of the pulmonary artery was also calculated.In addition,the image quality of CTA was evaluated independently by two experienced ra-diologists.Results The CT values of the pulmonary trunk and the subsegmental branches,and the CNR in Group A were signifi-cantly higher than those in group B,exhibiting statistical differences (t=8.6,P <0.001;t=12.2,P <0.001;t=1 1.3,P <0.001 respectively).However,the CT value of aorta in Group A was significantly lower than that in Group B (t=-7.6,P <0.001).The evaluation results of the CTA images by two radiologists showed that the image quality in Group A was better than that in Group B (Z =-8.6,P <0.001;Z =-9.0,P <0.001 ).Conclusion The image quality of pulmonary angiography with gemstone spectral CT using low contrast medium dose can be improved compared with the conventional spiral CT.
