| Description: | Multiband diffusion brain images - DICOM |
| Category: | Assessment centre ⏵ Imaging ⏵ Brain MRI ⏵ Diffusion brain MRI |
| Brain MRI scans + XNAT image package + Brain MRI |
| Participants | 76,409 | Value Type | Text | Sexed | Both sexes | Debut | Jul 2014 | |||
| Item count | 81,545 | Item Type | Bulk | Instances | Defined (2) | Version | May 2024 | |||
| Stability | Accruing | Strata | Primary | Array | No | Cost Tier | dX o2 s3 |
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The values held within this field are coded links to files held within a bulk repository, not the actual data itself.
Instance 3 : First repeat imaging visit (2019+)
5,201 participants, 5,201 items
Data not meaningful for statistical summary
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.
| 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 |
| Preview | Name | Res ID |
|---|---|---|
 | Example multibrand diffusion DICOM dataset | 220 |
 | Mapping of FMRIB brain pipeline headers to UKB fields | 2006 |
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