Data
81,545 bulk items are available, covering 76,409 participants.
Defined-instances run from 2 to 3, labelled using Instancing
2.
The values held within this field are coded links to files held within a bulk repository, not the actual data itself.
2 Instances
Instance 2 : Imaging visit (2014+)
76,344 participants, 76,344 items
Data not meaningful for statistical summary
Instance 3 : First repeat imaging visit (2019+)
5,201 participants, 5,201 items
Data not meaningful for statistical summary
Notes
The DICOM images were acquired using the following parameters:
Resolution: 2x2x2 mm
Field-of-view: 104x104x72 matrix
Duration: 7 minutes (including 36 seconds phase-encoding reversed data)
10x b=0, 50x b=1000, 50x b=2000
SE-EPI with x3 multislice acceleration, no iPAT, fat saturation
For the two diffusion-weighted shells, 50 distinct diffusion-encoding directions were acquired (and all 100 directions are distinct). The diffusion prepraration is a standard ("monopolar") Stejskal-Tanner pulse sequence. This enables higher SNR due to a shorter echo time (TE=92ms) than than a twice-refocused ("bipolar") sequence. This improvement comes at the expense of stronger eddy current distortions, which are removed in the processed data available in NIFTI format.
2 Related Data-Fields
Field ID | Description | Relationship |
25780 | Acquisition protocol phase. | Field 25780 indicates the protocol used to acquire Current Field |
20250 | Multiband diffusion brain images - NIFTI | Field 20250 is derived from Current Field |