The purpose of the study was to investigate patient-wise agreement among multiparametric magnetic resonance (MR) imaging sequences and radiologists, respectively, in the size assessment of hepatic metastases. A total of 30 liver metastases were identified from 20 patients and three radiologists independently measured the long and short axes for all metastases in T1-weighted, T2-weighted, diffusion-weighted imaging (DWI) with b of 0 and 800 s/mm2, and the apparent diffusion coefficient (ADC) map. We calculated the patient-wise intraclass correlation coefficient (ICCs) to estimate the interobserver and intersequence agreement in measured lesion size. Interobserver ICCs were 0.92-0.98 for different MR sequences and intersequence ICCs were 0.93-0.98. In conclusion, multiparametric MR imaging is a reliable tool for hepatic metastatic lesion measurement.
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