Study on Improved Individualized Pulmonary Artery CTA Scanning Scheme
Based on Time-Density Curve
XUE Bo1, FANG Yu2, YIN Hang1, LIU Yingjiang2, REN He2, LIN Meiyan1, DUAN Dengjie1, ZHANG Dechuan2
1. Department of Radiology, Chongqing Emergency Medical Center, Affiliated Center Hospital of Chongqing University, Chongqing
400014, China; 2. Department of Radiology, Chongqing Hospital of Traditional Chinese Medicine, Chongqing 400021, China
Abstract：Objective To explore the optimal scanning method of personalized pulmonary artery CT angiography scanning using the
time-density curve. Methods All patients were randomly divided into two groups. The control group (n=23) was treated with smart
tracking angiography, and the experimental group (n=25) was treated with low dose bolus injection. The peak time of pulmonary
trunk and pulmonary vein (or left ventricle) was measured. Pulmonary artery peak time was set as the start time of scanning. The
sequence parameters were adjusted so that the total scan time is less than the difference between the two peak times. Blind evaluation
method was used to evaluate the image quality, and SPSS 25.0 was used to statistically analyze the optimal rate of the image. Results
The optimal rate of images obtained by the smart tracking angiography was 73.9%, while that obtained by the individualized scanning
method based on the time-density curve was 96%, showing a significant difference (P=0.030). Conclusion The individualized
scanning method, which sets the delay time of contrast sequence to the peak time of pulmonary artery and controls the scanning time
within the difference between the peak time of pulmonary artery and pulmonary vein, can obtain excellent image quality and improve
the detection rate of pulmonary lesions.
