MBIRN: structural calibration dissemination-Acquisition Protocols

• Overview of dissemination contents
  • Multi-site phantom data: phantom that helps asses image distortions from gradient non-linearities
  • Multi-site human data: healthy volunteers, most of which were scanned twice at the participating sites
  • Human Protocol: multi-spectral 3D structural (FLASH with multiple flip angles: 30, 20, 5, 3 degrees)
  • Sites: Five sites with different 1.5T systems (Siemens, GE, Philips/Picker)

• Human Acquisition Protocol

Sequence: 3D spoiled gradient echo (FLASH type)
Vendor's standard birdcage RF coil
Slice orientation: Sagittal
No partial Fourier
NEX=1
FOV= 25cm
Phase matrix=192
Readout matrix=256
Number of Slices: 124 (no skip, whole head coverage, avoid wrap around)
Slice Thickness: 1.3mm-1.5mm
TE= minimum allowed with centered (symmetric) echo.
TR=20 ms
Slab Selection: No (i.e., hard RF pulses)
scan 1: flip angle 30 degrees  (T1-weighted image)
scan 2: flip angle 5 degrees (proton-density-weighted image)
scan 3: flip angle 20 degrees (T1-weighted image)
scan 4: flip angle 3 degrees  (proton-density-weighted image)
Acquisition time per scan: about 8min 12sec

• Phantom Acquisition Protocol

Sequence: 3D spoiled gradient echo (FLASH type)
Vendor's standard birdcage RF coil
Slice orientation: Sagittal
No partial Fourier
NEX=1
FOV= 40cm
Phase matrix=192
Readout matrix=256
Number of Slices: 124 (no skip, whole phantom coverage, avoid wrap around)
Slice Thickness: 2 mm
TE= minimum allowed with centered (symmetric) echo.
TR=20 ms
Slab Selection: No (i.e., hard RF pulses)
scan 1: flip angle 30 degrees without vendor's distortion correction
scan 2: flip angle 30 degrees with vendor's distortion correction (if available)
Acquisition time per scan: about 8min 12sec

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