At site A, MR imaging was performed with one of the following MR systems: at 1.5 T (Optima-MR450w or Signa-HDxt; GE Healthcare, Waukesha, Wis) with an eight- or 12-channel phased-array coil or at 3.0 T (Discovery-MR750 or Discovery-MR750w; GE Healthcare) with a 12- or 32-channel phased-array coil. Dynamic contrast–material enhanced T1-weighted MR imaging was performed by using a three-dimensional spoiled gradient-echo acquisition with spectrally selective intermittent fat inversion (LAVA) with true in-plane spatial resolution of 1.1–1.5 × 1.9–2.0 mm (1.5 T) and 1.3 × 1.6–1.7 mm (3.0 T) with 5 mm (1.5 T) and 3.4 mm (3.0 T) section thicknesses. Image acquisition time was approximately 22 seconds (1.5 T) or 20 seconds (3.0 T).
At site B, MR imaging was performed with either a 1.5-T MR system (Signa-HDxt; GE Healthcare) with an eight-channel phased-array coil or a 3.0-T MR system (Discovery-MR750w; GE Healthcare) with a 32-channel phased-array coil. Dynamic MR imaging was performed with LAVA with a real spatial resolution of 1.1–1.2 × 2.1–2.4 mm (1.5 T) and 1.1–1.2 × 1.8–2.0 mm (3.0 T) with 5 mm (1.5 T) and 4 mm (3.0 T) section thicknesses. Image acquisition time was approximately 16 seconds at both 1.5 T and 3.0 T. Detailed MR parameters are inTable E1 (online).
At site B, MR imaging was performed with either a 1.5-T MR system (Signa-HDxt; GE Healthcare) with an eight-channel phased-array coil or a 3.0-T MR system (Discovery-MR750w; GE Healthcare) with a 32-channel phased-array coil. Dynamic MR imaging was performed with LAVA with a real spatial resolution of 1.1–1.2 × 2.1–2.4 mm (1.5 T) and 1.1–1.2 × 1.8–2.0 mm (3.0 T) with 5 mm (1.5 T) and 4 mm (3.0 T) section thicknesses. Image acquisition time was approximately 16 seconds at both 1.5 T and 3.0 T. Detailed MR parameters are in