Observation of the Application Effect of Low-Dose Contrast Agent Pulmonary Artery CTA Imaging With 64 Slice Spiral CT
Objective To observe the application effect of 64-row spiral CT low-dose contrast agent pulmonary artery CT angiography(CTA)imaging.Methods A total of 68 patients with suspected pulmonary artery embolism(PE)treated from April 2021 to April 2023 of Quanzhou First Hospital Affiliated to Fujian Medical University were divided into two groups with 34 each.Both groups underwent 64-row spiral CT pulmonary artery CTA imaging,conventional-dose contrast medium in the control group and low-dose contrast medium in the observation group.The pulmonary vascular enhanced CT values,image quality,image signal-to-noise ratio(SNR),contrast to noise ratio(CNR),radiation dose parameters[dose length product(DLP),volume CT dose index(CTDIvol)]and adverse reactions were compared between the two groups.Results The enhanced CT values and image quality scores of the main pulmonary artery,left pulmonary artery,and right pulmonary artery in the observation group were(433.76±64.61)HU,(428.63±59.45)HU,(429.15±60.23)HU,(3.84±0.33)points,respectively.The enhanced CT values and image quality scores of the main pulmonary artery,left pulmonary artery,and right pulmonary artery in the control group were(418.49±62.27)HU,(410.91±57.16)HU,(412.83±58.90)HU,(3.91±0.35)points,respectively.There was no statistically significant difference between the two groups(P>0.05).The total incidence of DLP,CTDIvol,and adverse reactions in the observation group was(173.97±31.29)mGy·cm,(6.07±1.38)mGy,5.88%,while in the control group it was(286.52±64.10)mGy·cm,(8.74±2.05)mGy,23.53%,the observation group was lower than the control group,and the difference was statistically significant(P<0.05).The SNR and CNR of the observation group were(31.96±4.74),(36.59±8.21),respectively,while the SNR and CNR of the control group were(32.75±5.09),(37.11±8.67),respectively,there was no statistically significant difference between the two groups(P>0.05).Conclusion The image quality obtained by low-dose contrast pulmonary artery CTA imaging in 64-row spiral CT examination was comparable to that of conventional dose contrast artery CTA imaging,but 64-row spiral CT low-dose contrast pulmonary CTA could reduce radiation dose,reduce the incidence of adverse reactions and improve examination safety.
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