Third-generation Dual-source CT for Head and Neck CT Angiography with 70 kV Tube Voltage and 20-25 ml Contrast Medium in Patients With Body Weight Lower than 75 kg.
10.3881/j.issn.1000-503X.2017.01.002
- Author:
Yu CHEN
1
;
Yuanli ZHU
1
;
Huadan XUE
1
;
Yun WANG
1
;
Yumei LI
1
;
Zhuhua ZHANG
1
;
Zhengyu JIN
1
Author Information
1. Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
- Publication Type:Journal Article
- MeSH:
Artifacts;
Body Weight;
Computed Tomography Angiography;
methods;
Contrast Media;
Head;
diagnostic imaging;
Humans;
Neck;
diagnostic imaging;
Radiation Dosage;
Radiographic Image Interpretation, Computer-Assisted
- From:
Acta Academiae Medicinae Sinicae
2017;39(1):4-8
- CountryChina
- Language:English
-
Abstract:
Objective To investigate the image quality of head and neck CT angiography (CTA)using the third-generation dual-source CT combined with 70 kV tube voltage and 20-25 ml contrast medium (CM),and evaluate the effects of venous artifacts arising from the CM on the ipsilateral side of injection. Methods Totally 40 consecutive patients with suspected vascular diseases and body weight lower than 75 kg prospectively underwent head and neck CTA examination using the third-generation dual-source CT. CTA was performed with a third-generation dual-source CT system. Patients were randomly divived into 70 kV group (n=20)and 100 kV group (n=20). The 70 kV group used 20-25 ml CM and advanced modeled iterative reconstruction technique,and the 100 kV group used 40 ml CM and filtered back projection. Venous artifacts and CM residues were evaluated by a 3-point scale (1=excellent,3=poor),respectively. Results The effective dose of 70 kV group decreased 58% compared to 100 kV group (t=-18.14,P<0.001).In the 70 kV group,16 patients (80.0%)presented with venous artifacts and six of them (37.5%,6/16)affected the adjacent arteries. In the 100 kV group,19 patients (95.0%)presented with venous artifacts,and seven of them (36.8%,7/19)affected the adjacent arteries (Z=-0.878,P=0.380). In the 70 kV group,13 patients (65.0%)presented with obvious CM residues and two of them (15.3%,2/13)prolonged into the superior vena cava (SVC). In the 100 kV group,19 patients(95.0%)presented with obvious CM residues,and thirteen of them(68.4%,13/19)prolonged into the SVC (Z=-3.654,P<0.001). Conclusion Compared with the 100 kV,the third-generation dual-source CT for head and neck CTA,combined with 70 kV and 20-25 ml CM,can remarkably decrease the radiation dose,along with reduced CM residues and comparable venous artifacts.
