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To analyze the normal value of the iodine content in the left ventricular myocardium of healthy subjects and to observe if there is a segmental differences on iodine distribution by using the second generation dual-source dual-energy computed tomography myocardial first perfusion imaging.
In this retrospective study, 72 healthy subjects, who admitted to our department between January 2016 to 2017, with normal second generation dual-source dual-energy computed tomography and coronary CT angioghphy (CTA), electrocardiogram (ECG) results, normal cardiac, hepatic, renal function, normal myocardial enzymes results were enrolled, data from 67 out of 72 subjects with satisfactory image quality were analyzed using Siemens Dual Energy-Heart of PBV image processing software. In accordance with the standards of the American Heart Association myocardial 17 fractionation method, content of iodine was measured at different segmental left ventricular myocardium and aorta (left coronary artery from the opening level). The standardized containing iodine value (nIC) was calculated.
The iodine content of left ventricular myocardium in normal subjects was 3.2-7.9 mg/ml. The nIC of myocardium from 1st to 17th segments was (0.27±0.05), (0.30±0.06), (0.30±0.07),(0.30±0.03), (0.29±0.05), (0.28±0.04), (0.28±0.02), (0.31±0.06), (0.30±0.06), (0.26±0.05), (0.27±0.08), (0.29±0.07), (0.29±0.07), (0.30±0.06), (0.28±0.05), (0.28±0.07), (0.22±0.06). The nIC of the 17th segments was the lowest and was significantly lower than in other segments (p>0.05), the nIC was similar among the rest 16 segments (p>0.05).
The normal iodine content range in left ventricle myocardium is 3.2-7.9 mg/ml,and the lowest iodine content is detected in the apex.