Value of the"tri-low"imaging technique based on dual-source CT CARE kV in coronary CTA

ZHAO Deyuan; NIE Guanwei; GAO Yiming; DONG Qiangqiang; ZHAO Junlu

doi:10.20258/j.cnki.1006-9011.2025.11.011

Abstract：Objective To evaluate the application value of the"tri-low"technology based on dual-source CT CARE kV in coronary computed tomography angiography(CTA).Methods A total of 300 patients suspected of having coronary heart dis-ease and undergoing coronary CTA were selected.These patients were divided into two groups,A and B,based on whether they used CARE kV technology.Both groups were utilized CARE Dose 4D automatic milliampere scanning technology.The study com-pared the subjective and objective image quality and radiation dose of the coronary arteries between the two groups.In Group A,the iodine contrast agent flow rate was adjusted according to the CARE kV tube voltage value:3.5 mL/s at 70 kV,with a 0.5 mL/s increase for every 10 kV increase.The contrast agent injection dose was calculated as the contrast agent flow rate multiplied by 13 seconds.In Group B,the contrast agent injection dose and flow rate were determined based on the patient's weight:the con-trast agent injection dose was the patient's weight(kg)×0.8 mL divided by the contrast agent flow rate 13 mL/s.The study com-pared the contrast agent injection doses and flow rates between the two groups.Results The radiation dose in Group A was lower than that in Group B,with a statistically significant difference(P<0.05).The subjective image quality score in Group A was higher than that in Group B,but the difference was not statistically significant.The objective image quality score in Group A was higher than that in Group B,and the contrast agent injection dose and flow rate in Group A were lower than those in Group B(all P<0.05).Conclusion The"tri-low"technology based on dual-source CT CARE kV can significantly reduce the effective radiation dose of subjects and reduce the injection dose and flow rate of contrast agent during coronary artery CTA examination.