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). 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 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. Key words: Tomography, X-ray computer; Bronchial artery CT angiography; Image Quality; Radiation dose
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.