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Chapter 1 - Overview and Safety
International regulations specify that a minimum source-skin distance (SSD)
of 300 mm shall be maintained. However, for specific surgical applications, a
minimum SSD of 200 mm is required.
The cover of the hole where the X-ray is emitted is the nearest position to the
X-ray source that the patient body can reach during normal use, which me-
chanically preserves the minimum SSD.
The G-Arm system may come with an optional accessory - skin spacer - to
create additional space between the focal spot and the patient body. The
minimum SSDs that the G-Arm system can reach, with or without the skin
spacer installed, are illustrated as in the figure below:
In normal conditions, the SSD shall be far enough to keep the dosage as low
as possible.
DANGER
18
Figure 1-2: Minimum Source-skin Distance (SSD)
1
SSD w/ Skin Spacer
3
Skin Spacer
Exposing the eyes or the skin to the primary X-ray beam may result in
severe radiation burns in the event of repetitive or prolonged expo-
sures. The hazards are most often associated with exposure to X-ray
radiation including increased risks of cancer and genetic effects in
exposed populations.
2
SSD w/o Skin Spacer
4
Focal spot
Radiation Protection
B6 User Manual
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