View source for 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)

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* '''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

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* '''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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