Chapter 4 - Capture images
9.
If required, select Press to check OCT quality to replay the scan.
10. Review the scan results including SLO position and SNR.
11. Check the quality of the images (see How to check OCT scans on page46).
Note
l You can run individual auto-routines if the patient has changed position since alignment. Select
the auto-routine you want to run or select Redo OCT setup.
l The patient may blink normally when the images are being processed.
Reference
Using the hand control 33
The patient's view of OCT alignment 44
How to check OCT scans 46
How to capture an OCT follow-up scan 45
How to optimize OCT scan quality 44
4.8.1 The patient's view of OCT alignment
When in OCT capture mode the patient will see the following:
l Alignment target
l Tracking scan as a striped background
To reduce the possibility of movement artifacts the patient should maintain focus on the center of the green
alignment target. Ask the patient to keep their head still in the standard alignment during OCT imaging.
FIGURE 13: Indication of what the patient will see when being aligned for OCT imaging
Note
In some instances you may choose to ask the patient to align slightly off center. For example, when
capturing an ONH scan where the fovea to ONH distance is very wide, you may be unable to position the
scan location on the center of the optic nerve head. Ask the patient to look off center towards a suitable
reference point on the alignment target and recapture the optomap image.
For more information on the alignment targets (see Patient Alignment Guide on page83).
4.8.2 How to optimize OCT scan quality
The following advice will help you optimize the OCT scan quality.
You should instruction the patient in terms of positioning, fixation, and when to blink and when to not blink
and hold still. Providing instructions on these important aspects will help obtain good quality images.
Page 44 of 84 Part Number: G110230-003-ENG
English Copyright 2019-2021, Optos plc. All rights reserved.
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