Brainlab RT/RS Hardware User's Manual page 74

Imaging with the Headring and Mask System
Localization Procedure
To perform the x-ray localization, one sagittal and one coronal image of the head are required.
The two copper squares must be entirely visible in both images. The user should also ensure that
the corners of the squares are fully visible in the x-ray projection's field of view, as shown in Figure
41.
For further scanning instructions and scan settings, please refer to the PatXfer user guide.
Verify that the images are not distorted if any form of digital imaging has been used.
The CT/X-Ray Localizer for Leksell Headring and the CT/X-Ray Localizer may only be used
with a Brainlab treatment planning system.
Do not use the CT/X-Ray Localizer for Leksell Headring or the CT/X-Ray Localizer if it is any
way warped or damaged, or any of the parts are loose.
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Figure 41
Hardware User Guide Rev. 4.9 RT / RS Stereotactic Hardware