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IMMOBILIZATION HARDWARE
3.2.3
Removing and Reattaching the Mask
Before you Proceed
Be sure to record the appropriate size of the spacer, size of the clips and the name of the
patient on the provided sticker and attach it to the mask, to avoid mistakes when refitting
the mask.
Never open the screws that mount the vertical posts to the mask ring if the mask has
already been placed on the patient and is secured with the clips.
If the patient moves when fixed to the Brainlab mask system and applies force to the
devices, the fixation is no longer accurate.
How to Remove the Mask
Steps
How to Reattach the Mask
Steps
How to Adjust Mask Fit
The Stereotactic Mask System can be tightened or loosened (e.g., if the patient has lost weight).
To adjust the fit of the mask, use the following procedure:
Steps
Mask Thickness
The thickness of the material will vary depending on the size of the patient's head and the
technician's ability to produce an evenly-stretched mask. The density of the material is
approximately 1.15 g/cm
essentially tissue equivalent.
Hardware User Guide Rev. 4.9 RT / RS Stereotactic Hardware
1.
Make sure the mask has hardened sufficiently (See page 64).
2.
Remove the clips.
3.
Remove the top, then middle masks.
1.
Mount the vertical posts to the mask ring.
2.
Affix the rear mask to the vertical posts.
3.
Lower the patient's head onto the rear mask.
4.
Reattach the middle mask, then the top mask.
5.
Secure the mask with the respective clips to the vertical posts.
1.
Remove the 2 mm clips and the top and the middle mask (the top two layers).
Replace the 2 mm spacer:
2.
• with the 1 mm spacer to tighten mask fit. To tighten further, remove the 1 mm spacer.
• with the 3 mm or 4 mm spacers to loosen mask fit.
3.
Place the two sheets back in their former position and secure them with the new clips.
3
at room temperature and 1.06 g/cm
3
at body temperature, making it
65
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