Three-dimensional whole-liver perfusion magnetic resonance imaging in patients with hepatocellular carcinomas and colorectal hepatic metastases

摘要

Background Three-dimensional (3D) whole-liver perfusion magnetic resonance(MR) imaging with parallel imaging, a novel imaging method to characterize tumor vascularization in vivo, has recently been applied to comprehensively image perfusion changes in large tumors. Coupled with new perfusion software, this technique enables motion correction, registration, and evaluation of perfusion MR parameters. The purpose of this study was to assess the feasibility of 3D whole-liver perfusion MR, for imaging hepatocellular carcinoma (HCC) and colorectal hepatic metastases (CRHM). Methods 26 patients with hepatic tumors (10 HCC; 16 CRHM) were subjected to 3D whole-liver perfusion MR with a temporal resolution of 3.7?seconds. The following estimated perfusion parameters were measured: the volume transfer constant Ktrans (min-1); the volume (V_e) of extravascular extracellular space (EES) per volume unit of tissue; and the flux rate constant between EES and plasma K_ep (min-1). Statistical analysis was conducted to investigate inter-observer characteristics and significance of the measured parameters. Results Inter-observer agreement analysis (95% limits of agreement) yielded a mean difference of ?0.0048?min-1 (?0.0598?~?0.0502) for Ktrans , -0.0630?ml (?0.5405?~?0.4145) for V_e, and ?0.0031?min-1 (?0.0771?~?0.0709) for K_ep respectively. When comparing images from patients with HCC vs. CRHM, significant differences were seen for the mean Ktrans (p?=?0.017), but not for V_e(p?=?0.117) or K_ep(p?=?0.595). Conclusion Herein we show that 3D whole-liver MR perfusion imaging with semi-automatic data analysis is feasible and enables the reliable quantitative evaluation of the perfusion parameters for HCCs and CRHMs.