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양달모,장건호,김현철,김상원,김혁시 대한자기공명의과학회 2014 Investigative Magnetic Resonance Imaging Vol.18 No.3
Purpose : To evaluate the relationship between the speed of enhancement of hepatic hemangiomas on gadoliniumenhancedMRI and ADC values by using various parameters, including the D, f, D* and ADCfit on intravoxel incoherentmotion (IVIM) MR Imaging. Materials and Methods: The institutional review board approved this retrospective study. A total of 47 hepatic hemangiomasfrom 39 patients were included (20 men and 19 women). The hemangiomas were classified into three typesaccording to the enhancement speed of the hepatic hemangiomas on gadolinium-enhanced dynamic T1-weightedimages: rapid (Type A), intermediate (Type B), and slow (Type C) enhancement. The D, f, D* and ADCfit values were calculatedusing IVIM MR imaging. The diffusion/perfusion parameters and ADC values were compared among the three typesof hemangiomas. Results: Both the ADCfit and D values of type C were significantly lower than those of type A (P = 0.0022, P = 0.0085). However, for the f and D*, there were no significant differences among the three types. On DWI with all b values (50,200, 500 and 800 sec/mm2), the ADC values of type C were significantly lower than those of the type A (P < 0.012). For bvalues with 800 sec/mm2, the ADC800 values of the type C hemangiomas were significantly lower than those of type B (P= 0.0021). We found a negative correlation between hepatic hemangioma enhancement type and ADC50 (ρ= -0.357, P= 0.014), ADC200 (ρ= -0.537, P = 0.0001), ADC500 (ρ= -0.614, P = 0.0001), and ADC800(ρ= -0.607, P = 0.0001). Therefore, four ADC values of ADC50, ADC200, ADC500, and ADC800 were decreased with decreasing enhancementspeed. Conclusion: Hepatic hemangiomas had variable ADCs according to the type of enhancement, and the reduced ADCs inslowly enhancing hemangiomas may be related to the reduced pure molecular diffusion (D).
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