The investigation on image quality and radiation dose of low dose wider detector array CT scanning for young children with congenital heart disease
10.3760/cma.j.issn.0254-5098.2018.08.013
- VernacularTitle:宽体探测器CT低剂量扫描在婴幼儿先天性心脏病中的图像质量及辐射剂量研究
- Author:
Lijuan FAN
1
;
Dongsheng XU
;
Jiwang ZHANG
;
Junbo LIU
;
Donghai FU
;
Jian LING
;
Tielian YU
Author Information
1. 泰达国际心血管病医院放射科
- Keywords:
Computed tomography;
Congenital heart disease;
Radiation dosage;
Iterative reconstruction
- From:
Chinese Journal of Radiological Medicine and Protection
2018;38(8):626-630
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the image quality and radiation dose of the wider detector array CT scanner with low dose scanning mode in young children with congenital heart disease.Methods Totally 100 consecutive pediatric patients younger than 3 years with congenital heart disease were enrolled.They were divided into two groups.The low dose group with fifty patients underwent axial CT scanning with ECG gating,and the control group with fifty patients were scanned with volume helical shuttle (VHS) technique.CT number and noise of two groups images at the level of ascending aorta,main pulmonary artery,left ventricle,descending aorta and adjacent muscle were measured,and the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated.The double blind method was used to evaluate subjective image quality of the level of intra-cardiac,extra-cardiac and coronary artery.Effective dose was also calculated for both groups.Results No significant difference was found in the CT number,image noise,SNR,and CNR between the two groups in the same anatomic regions (P ＞ 0.05).No significant difference was found in subjective image quality between the two groups for the intra-cardiac and extra-cardiac structure(P ＞0.05).The subjective image quality of coronary artery was significant higher in low dose group than the control group(4.10 ± 0.90 vs.2.88 ± 0.82,Z =-5.818,P ＜ 0.05).Effective dose was (0.57 ± 0.30)mSv in group A and (2.39 ± 1.15)mSv in group B with dose savings of 76％ (t =-11.642,P ＜ 0.05).Conclusions The wider detector array CT scanner with low dose scanning mode can improve image quality with lower radiation dose.
