| Fan Lijuan,Xu Dongsheng,Zhang Jiwang,Liu Junbo,Fu Donghai,Ling Jian,Yu Tielian.The investigation on image quality and radiation dose of low dose wider detector array CT scanning for young children with congenital heart disease[J].Chinese Journal of Radiological Medicine and Protection,2018,38(8):626-630 |
| The investigation on image quality and radiation dose of low dose wider detector array CT scanning for young children with congenital heart disease |
| Received:March 12, 2018 |
| DOI：10.3760/cma.j.issn.0254-5098.2018.08.013 |
| KeyWords:Computed tomography Congenital heart disease Radiation dosage Iterative reconstruction |
| FundProject: |
| Author Name | Affiliation | E-mail | | Fan Lijuan | Department of Radiology, TEDA International Cardiovascular Disease Hospital, Tianjin 300457, China | | | Xu Dongsheng | Department of Radiology, TEDA International Cardiovascular Disease Hospital, Tianjin 300457, China | | | Zhang Jiwang | Department of Radiology, TEDA International Cardiovascular Disease Hospital, Tianjin 300457, China | | | Liu Junbo | Department of Radiology, TEDA International Cardiovascular Disease Hospital, Tianjin 300457, China | | | Fu Donghai | Department of Radiology, TEDA International Cardiovascular Disease Hospital, Tianjin 300457, China | | | Ling Jian | Department of Radiology, TEDA International Cardiovascular Disease Hospital, Tianjin 300457, China | | | Yu Tielian | Department of Radiology, General Hospital of Tianjin Medical University, Tianjin 300052, China | tjzyyytl@163.com |
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| 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. |
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