Objective:To assess the diagnostic value of intracranial time of flight(TOF)magnetic resonance angiography(MRA)in predicting extracranial internal carotid artery stenosis(ICAS).Methods:A retrospective analysis was conducted on 51 patients(lesion group)were diagnosed as moderate(from 50%to 69%)or severe(from 70%to 99%)unilateral extracranial ICAS at Hebei Petro China Central Hospital from August 2020 to December 2021.At the same time,100 patients without extracranial ICAS were selected as the control group.The intracavitary signal intensity(SI)on the images,which originated from TOF-MRA,of bilateral internal carotid arteries of two groups were measured.And then,the SI ratio values of opposite side to diseased side between two groups were compared.Results:The SIR value(1.463)of the right intracranial C4 segment in the lesion group was significantly higher than that(1.035)of the control group,and the difference between the two groups was statistically significant(t=7.209,P<0.001).The average SIR value of left stenosis in the lesion group was 1.362,while that of the control group was 1.000.The critical value of the operating characteristic curve(ROC)of subjects with right C4 stenosis was 1.086,and the sensitivity and specificity of that were respectively 75%and 81%.The area under curve(AUC)value of ROC curve was 0.81.The critical value of the ROC of left C4 stenosis was 1.104,and sensitivity and specificity of that were respectively 70%and 84%,and the AUC was 0.80.Conclusion:The SIR on TOF-MRA can effectively predict the occurrence of extracranial ICAS.
Magnetic resonance angiography(MRA)Time of flight(TOF)Carotid artery stenosis
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