Siemens SOMATOM Spirit, Operator'S Manual, Page: 156 / 484

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Patient Table System Description
B.3-6 SOMATOM Spirit
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Working principle
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The height adjustment mechanism of the patient table works
on a principle called the cobra principle. Like the snake of that
name, the horizontal position of the tabletop (“head of the
cobra”) changes as it is raised or lowered.
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On raising, the table top (and therefore the patient too)
moves toward the gantry.
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On lowering both move away from the gantry.
The usual working height corresponds to the isocenter of the
system.
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Do not change the table height during the examination,
because it alters the slice position too.
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Limit values
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The table top can be lowered to approximate 500 mm above the
floor level (for example, during patient positioning).
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The limiting values for the vertical and horizontal table setting
and the angle of inclination of the gantry are interdependent.
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Before you can lower the patient table to its minimum height,
you must retract the table top entirely and set the gantry verti-
cal.
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Always ensure that the movement is not obstructed by any
objects.
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Do not place any objects underneath the patient table!
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