Initial application of prospective electrocardiography-triggering high-pitch spiral acquisition by dualsource CT in children with congenital heart diseases

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Author:
JI Xiao-peng(Department of CT, Shandong Medical Imaging Research Institute, Shandong University School of Medicine, Jinan 250012, China)
CHEN Li-guang(Department of CT, Shandong Medical Imaging Research Institute, Shandong University School of Medicine, Jinan 250012, China)
WANG Xi-ming(Department of CT, Shandong Medical Imaging Research Institute, Shandong University School of Medicine, Jinan 250012, China)
CHENG Zhao-ping(Department of CT, Shandong Medical Imaging Research Institute, Shandong University School of Medicine, Jinan 250012, China)
NIE Pei(Department of CT, Shandong Medical Imaging Research Institute, Shandong University School of Medicine, Jinan 250012, China)
QIAO Hong-yan(Department of CT, Shandong Medical Imaging Research Institute, Shandong University School of Medicine, Jinan 250012, China)
LI Hai-ou(Department of CT, Shandong Medical Imaging Research Institute, Shandong University School of Medicine, Jinan 250012, China)
YANG Shi-feng(Department of CT, Shandong Medical Imaging Research Institute, Shandong University School of Medicine, Jinan 250012, China)
Journal Title:
Chinese Journal of Radiology
Issue:
Volume 46, Issue 10, 2012
DOI:
10.3760/cma.j.issn.1005-1201.2012.10.012
Key Word:
Heart defects,congenital; Tomography, spiral computed; Radiation dosage

Abstract: Objective To explore the clinical value of prospective electrocardiography-triggering high-pitch spiral acquisition by dual-source CT (HP mode ) in children with congenital heart diseases (CHD).Methods Thirty-six patients ( mean age:0.67 years,range:1 month to 2 years and 6 months; 25 males;mean weight:7.7 kg)underwent prospective ECG-triggering high-pitch spiral acquisition.The dose length product (DLP) was recorded to calculate effective dose ( ED ).Two experienced radiologists made diagnosis and assessed the overall image quality by a five-point scale independently.The consistency of their judgment was determined by Kappa statistics.Surgeries were performed in 29 patients,and conventional cardiac angiography(CCA) was performed in 7 patients.The accuracy,sensitivity and specificity of HP mode were calculated based on the surgical or CCA findings.Results The DLP was (5.12 ± 1.64) mGy.cm with a range of 2.4 mGy · cm to 9.2 mGy · cm and ED was (0.125 ± 0.027 ) mSv ranging from 0.078 mSv to 0.179 mSv.The average subjective image quality score was 4.2 ± 0.7.All images were diagnosable.Two radiologists made good agreement ( K =0.774,P < 0.05 ).The accuracy,sensitivity and specificity of HP mode were 98.9%,94.2% and 99.8%,respectively.Conclusion Low radiation dose with the accurate diagnosis of anomalies makes HP mode a new choice for children with CHD.

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