Computed tomography pulmonary angiography with right atrium bolus triggering / 实用放射学杂志

ABSTRACT

Objective To optimize the CT pulmonary angiography (CTPA)using right atrium (RA)CT value monitoring to determine the accurate time to peak CT value of pulmonary artery.Methods Sixty patients were randomly divided into two groups and 30 patients for each.Group PT:CTPA acquisition was triggered by pulmonary trunk monitoring,holding breath and 70 mL contrast agent (CA).Group RA:CTPA was performed using triggering from RA with spontaneous respiration and 40 mL CA.Imaging quality, average CT values of pulmonary arteries and veins,as well as their density difference were compared.Results The imaging quality, average CT values of pulmonary arteries and artery-veins density difference were significantly higher in group RA (P 0.05).Conclusion CTPA imaging is optimized by triggering from RA CT value monitoring.This technique provides the optimal enhancement of pulmonary artery and minimal contrast filling of pulmonary venous with reduced doses of CA.