: Data-Field 26300

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Data

7,155 bulk items are available, covering 7,155 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+)
5,356 participants, 5,356 items
Data not meaningful for statistical summary

Instance 3 : First repeat imaging visit (2019+)
1,799 participants, 1,799 items
Data not meaningful for statistical summary

Notes

Arterial Spin Labelling images in NIFTI format. The source DICOM image was acquired using the following parameters:

Resolution: 3.4x3.4x4.5 mm
Field-of-view: 64x48x32 matrix
Scan duration: 2 minutes
Preparation: Multi-postlabelling delay pseudocontinuous arterial spin labelling, labelling duration 1800 ms, postlabelling delays 400, 800, 1200, 1600 and 2000 ms, labelling plane offset from the centre of the imaging volume 90 mm
Readout: 2-shot segmented 3D-GRASE, left-right phase encoding, refocussing flip angle 120
Background suppression: pre-saturation and two inversion pulses (to null tissues with T1 = 700 ms and 1400 ms, 100 ms prior to excitation)
Volumes: one label/control pair per postlabelling delay plus one calibration (M0) volume without labelling or background suppression (effective TR 5000 ms).

The average size of these NIFTI datasets is 75MB per participant.

1 Related Data-Field

Field ID	Description	Relationship
20266	Arterial spin labelling brain images ...	Current Field was derived from Field 20266

1 Resource

Preview	Name	Res ID
	Mapping of FMRIB brain pipeline headers to UKB fields	2006

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