Dual energy spectral CT pulmonary artery angiography with low dose contrast medium

GUA N Chang-xu; SONG Rui-juan; ZHA NG H ao-liang; ZHA NG Feng-xiang

Abstract：Objective To investigate the value of energy spectrum using low‐dose CT imaging contrast agents in the di‐agnosis of pulmonary embolism and pulmonary infarction .Methods From January to March 2014 ,30 patients with sus‐pected pulmonary embolism were subjected to dual energy spectral CT pulmonary artery angiography with low dose con ‐trast medium in our hospital .By this technique ,we obtained conventional CT pulmonary angiography images ,single‐ener‐gy image and the image of iodine‐based substances ,observed whether or not the pulmonary artery had emboli ,recorded the number of emboli ,emboli site and extent of thrombosis ,analyzed imaging iodine‐based substances map ,recorded the loca‐tion and the number of the reduced perfusion area in lung .Results The pulmonary embolism was definitely diagnosed 12 patients .A total of 36 emboli were found in the pulmonary artery and its branches ,of which 8 were found in left and right pulmonary artery ,16 in lung artery ,12 in pulmonary artery segment .In all ,16 reduced perfusion areas in lung were measured .Conclusion Spectrum of low‐dose CT pulmonary angiography with contrast agent can not only reduce the a‐mount of contrast agent to minimize the occurrence of adverse reactions to contrast agents ,but take the advantages of the best single energy diagram and iodine‐based substances ,such as maps and quantitative measurement tools ,to make more accurately and safely the diagnosis of pulmonary embolism and pulmonary infarction as well .