| Wang Zhenzhang,Cao Guoquan,Fu Pingping,et al.Influence on radiation dose and image quality of bronchial artery CTA for high heart rate patients with single-cardiac dynamic volumetric scanning in 320-row CT[J].Chinese Journal of Radiological Medicine and Protection,2019,39(2):155-160 |
| Influence on radiation dose and image quality of bronchial artery CTA for high heart rate patients with single-cardiac dynamic volumetric scanning in 320-row CT |
| Received:October 26, 2018 |
| DOI：10.3760/cma.j.issn.0254-5098.2019.02.014 |
| KeyWords:Tomography, X-ray computer Bronchial artery CT angiography Image Quality Radiation dose |
| FundProject: |
| Author Name | Affiliation | E-mail | | Wang Zhenzhang | Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China | | | Cao Guoquan | Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China | | | Fu Pingping | Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China | | | Guo Xianzhong | Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China | | | Yang Yunjun | Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China | | | Man Yi | Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China | | | Chen Weijian | Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China | wyyycwj@163.com |
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| Abstract:: |
| Objective To assess the influence on radiation dose and image quality of bronchial artery CT angiography for hemoptysis patients with high heart rate and free respiratory with single-cardiac dynamic volumetric scanning using 320-row CT. Methods During October 2016 and May 2017, totally 151 hemoptysis patients with heart rate ≥ 65 bmp and free-breathing were scanned for bronchial artery imaging with prospective ECG-gating 320-detector row dynamic volume CT. The patients were randomly divided into two groups, group A(81 cases) and group B(70 cases). Default multi-cardiac cycle scanning style was used for group A to generate multi-sector images A1 which were reconstructed corresponding single-sector images A2. Single-cardiac periodic scanning was used to get single-sector images for group B. The effective doses (E) of two scanning types, the quantitative parameters of image quality[vascular CT value, image noise (SD), signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR)] and subjective scoring of group B and A1, A2 were compared. The detection accuracy of the systemic artery-pulmonary circulation shunts was evaluated by ROC curve against digital subtraction angiography(DSA). The measurement data was analyzed by independent sample t test while the grade data was tested by independent sample nonparametric test. Results The median value of radiation dose in group B was significantly lower than that of group A (1.42 mSv vs. 3.06 mSv, Z=-8.724,P<0.05). There were no statistically significant differences in quantitative parameters and subjective scoring points of image quality between group B and group A2 (P>0.05). The median subjective scoring points of group B was 4, which was better than that of group A1 (Z=-10.584, P<0.05). The differences of SD, SNR, CNR between group B and group A1 were statistically significant(t=-0.983, 7.898, 7.695, P<0.05), and group B had higher SD, SNR and CNR. There was no significant difference in the mean CT values of the aorta and pulmonary artery between the two groups (P>0.05). The detection accuracy of the systemic artery-pulmonary circulation shunts was moderately high in group B and group A2. The area under the ROC curve (AUC) was 0.891 and 0.864, respectively (Z=7.210, 7.430, P<0.05). The accuracy of group A1 was poor. The area under the ROC curve was 0.626 (Z=2.434, P<0.05). The sensitivity of group B and group A2 were 80% and 76.2%, respectively (P<0.05), and 28.6% of group A1 (P<0.05). Conclusions The 320-row single-cardiac periodic dynamic volume CT can effectively improve the image quality and the detection accuracy of the systemic-pulmonary circulation on CT, and reduce the radiation dose of the bronchial artery CT angiography. |
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