Optima mr360 1.5t

MR images were acquired using a GE Optima MR360 1.5T (Optima MR360, GE Healthcare, USA) equipped with an eight-channel abdominal coil. Patients fasted for four hours before the scan. Baseline MRI included T1-weighted turbo field-echo in-phase and opposed sequence (T1WI), Fat -suppressed T2-weighted images (Fs-T2WI). Diffusion-weighted imaging (DWI) was obtained by respiratory-triggered single-shot echo with b-values of 0 and 600 s/mm².
Gadolinium meglumine acid (Gd‐DTPA) with a total dose of 0.1 mmoL/kg was injected into the median cubitus vein at a rate of 2.0 mL/s with a high-pressure syringe washing with 20 mL of normal saline. The arterial phase (AP), portal venous phase (PVP), and delay phase (DP) scans were performed 20–30 s, 50–60 s, and 90–120 s after the injection of Gd‐DTPA, respectively. Detailed scanner and scan parameters can be found in Supplementary Table 1.

MRI studies were performed following standardized protocols on GE Optima MR360 1.5T, GE Discovery MR750 3.0T, GE SIGNA Architect 3.0T, and Siemens Prisma 3.0T scanners. MRI contrast agents included gadobenate dimeglumine, gadodiamide, gadobutrol, and gadoxetate disodium and were administered according to the manufacturer-recommended weight-based doses.
All patients underwent MRI examination procedures. Respiratory training was performed before examination, and end-expiratory scans were obtained. All patients underwent routine plain MRI (including axial T1WI, T2WI, and DWI) and contrast-enhanced scans (dynamic contrast-enhanced), and arterial, portal, and delayed phase images were acquired by injecting recommended dosage body mass of contrast medium with an equivalent volume of saline through the cubital vein at a 3-mm/s flow rate using a high-pressure injector and bolus injection of contrast material. Hepatobiliary phase images were acquired at 20 min.

All MR images were obtained from GE Optima MR360 1.5 T equipped with 8-channel abdominal coils. Patients were fasted for 4 h before the scan. Gd-BOPTA (MultiHance, Bracco) with a total dose of 0.1 mmol/kg was injected into the median cubitus vein at a rate of 2.0 ml/s with a high-pressure syringe, followed by washing with 20 ml of normal saline. Arterial, portal, delayed, and hepatobiliary scans were performed at 20–30 s, 50–60 s, 90–120 s, and 60 min after the injection of GD-BOPTA, respectively. HBP scans were performed at 120 min after the injection of contrast agent for patients with impaired liver function. Fat-suppressed T2-weighted images, T1WI, and FIESTA were collected. Detailed scanner and scan parameters can be found in Supplementary Table E1.