GE BrightSpeed Elite, Preinstallation Manual

Page: 85 / 170

GE H
EALTHCARE
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IRECTION
5141177-100, R
EVISION
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RIGHT
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: P
RE
-I
NSTALLATION
Chapter 4 - Room Planning Page 85
4 – Room Pla
nning
8.3 Floor Strength
Concrete floors must have a minimum strength of f'c = 2000 psi (1.4 X 10
7
Pa) at 28 days (curing
time) for mounting floor anchors. It is the responsibility of each customer to have appropriate tests
performed to determine and measure concrete strength.
Note: If installing the GE BS scanner on a floor type thinner than a 102 mm (4 in. ) concrete floor, the
purchaser, at their expense, shall provide acceptable anchoring and mounting methods that meet
all structural specifications provided in sections 8.1 through 8.5 of this Pre-Installation Manual.
8.4 Floor Levelness
The CT Room floor levelness requirement is important for accurate patient positioning. Floor
levelness in the Scan Room must not be greater than 6 mm (0.25 in. ) between depression and high
spots over any 3048 mm (120 in. ) distance within the area of the gantry/table template (see
Figure 2-1, on page 45 ).
Note: Floor must meet levelness specification to properly align the table gantry. Minimum gantry height at
this specification will be 1/2" (15 mm) to prevent cable crushing.
Table level may not be achievable if overall floor levelness is greater than the specification.
Overall floor level must be 0" to use under gantry cable entrance. Minimum gantry height will be
3/4" 20 mm with this option to prevent cable crushing.
The use of floor shims is not suitable to achieve floor levelness. It is recommended that the concrete
be leveled to meet this requirement.
8.5 Floor Vibration
The CT equipment may be sensitive to vibration in the frequency range of 0.5 to 20 Hz depending
on the amplitude of the vibration. It is the customers responsibility to contract a vibration consultant
or qualified engineer to implement design modifications to meet the specific limits, However, it is
ultimately the customer/architect/engineer responsibility to design the site solution.
8.5.1 Steady State Vibration
The maximum steady state vibration transmitted through the floor should not exceed 10
-3
m/s
2
rms
maximum single frequency above ambient baseline from 0.5 to 80 Hz (measured in any 1 hour
during a normal operating period).
8.5.2 Transient Vibration
The behavioral characteristics must be such that any measurable transient disturbance must also
be minimized to less than 0.01 m/s
2
peak-to-peak.