Table 3.

MINIMAP MR imaging parameters

MR imaging protocol

1.Dixon series: Axial T1-weighted 3-D 2-point Dixon gradient echo sequence capable of generating water-only and fat-only images in addition to in-phase and op-phase images 2.Diffusion-Weighted images (DWI) and ADC map: Axial DW-SS-EPI with two b-values; 0 and 500 mm2/sec; respiratory triggered 3.MRCP images  a. 2D thick slab MRCP, 40-mm-thick, 6-8 para-coronal projections to best show the pancreatic duct from different angles  b. 3D MRCP: 1 mm respiratory synchronized 3-D turbo spin-echo sequence.  c. Secretin-stimulated 2D thick slab MRCP: After IV infusion, the ductal system is imaged via a coronal single-shot turbo spin-echo sequence, repeated every 20 s for 8 min. 4. Pre-contrast T1 mapping: Dual flip-angle spoiled gradient echo (SPGR) technique 5. Obtain B1 map (for compensation of field inhomogeneity) 6. T1-weighted images: 3-D gradient echo with fat suppression: a. pre-contrast b. arterial c. portal venous d. 5-minute delayed phases 7. T2-weighted images with fat suppression: axial 8. T2-weighted images: turbo spin-echo (TSE) or a variant of TSE: axial and coronal, without fat suppression 9. Post-contrast T1 maps 10. MR elastography: MRE will be performed using a passive driver operating at 40 (or 60 Hz). Axial 3D echo planar imaging will be used to acquire images.

Parameters may change depending on MRI hardware and optimization with phantom tests