: Data-Field 30005

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Data

83,193 bulk items are available, covering 78,252 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+)
78,002 participants, 78,002 items
Data not meaningful for statistical summary

Instance 3 : First repeat imaging visit (2019+)
5,191 participants, 5,191 items
Data not meaningful for statistical summary

Notes

This field contains image files from the carotid ultrasound imaging.
These images are provided in .mat file format.

CI_F - A 3-dimensional matrix of single precision values representing a 2-dimensional image through time.
FrameNum - The number of frames.
HP - Various meta-data describing the acquisition of the ultrasound image.
Xhv and Yhv: These variables may assist with coordinating plotting the image data. The values are calculated from the size of display area and sampling pitch. The image data at Fr frame: CI_F(Frame, i, j). Plot the value of CI_F(Fr, i, j) at the coordinate (Xhv(i), Yhv(j)).

Data have not been preprocessed and therefore, temporal and spatial filtering may be required to optimally utilise the images. UK Biobank cannot currently provide guidance on the best approach for these filterings.

Images in the original .Cine format, other images, and meta-data from the measurement device can be found in field 20241.

2 Related Data-Fields

Field ID	Description	Relationship
20241	Raw carotid device data	Current Field is derived from Field 20241
30029	Reason cine file not available	Field 30029 explains why there is no value for Current Field

3 Resources

Preview	Name	Res ID
	Carotid ultrasound close-up	941
	Carotid ultrasound in progress	4351
	Carotid ultrasound protocol	511

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