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Parking and Access Requirements
The mobile CT trailer unit weighs up to 23 tonnes. The trailers
are approximately 14 metres long and 2.6 metres wide (up to 4.25
metres wide with the sides fully extended).
Access consideration must be given to the tractor, the patient
lift, the stairs and the belly compartments, for patient entry and
trailer service. A total paved area of at least 6 x 20 meters is
recommended for tractor access and patient handling.
It is important, especially with mobile CTs, that the site is level.
It is possible to accommodate a fall of no more than 150 mm over
the length and 50 mm over the width of the unit. Road quality surface
for the site is acceptable provided that there are no drains, ducts
or other below ground structures that could be damaged by the weight
of the scanner.
When parked, the unit uses two front hydraulic jacks and two fixed
height stands in the rear, for stabilising purposes or four fixed
height stands if a full size pad is available. The trailer is placed
on ‘spreader plates’ that spread the load to avoid damage
to the road surface.
In cases where the ground cannot support the scanner in the proposed location, a concrete support pad constructed to
ensure a level surface capable of accommodating the weight of a mobile scanning unit is recommended.
Pad Requirements
The following is a list of recommendations and requirements for
a concrete support pad however, due to varying site conditions a
local contractor should be consulted for actual pad design.
Support Pad
A full pad measuring 3.04m x 13.68m is required. The support pad
must be level (no more than 150 mm variations over length and 50
mm variation across length) to insure proper operation of the Mobile
CT unit.
Service Pad
A full pad measuring 6.40m x 15.50m is recommended to provide service
access. This is optional if space is available.
Steel Reinforced Concrete Pad
Maximum 20kg/m2 of steel.
Power Requirements
Mains Electrical Supply
A single electrical power source is required for operation of the
CT system.
3/N/PE AC 400V service fused at a minimum of 125A per phase, although
a supply of 175A per phase is preferable.
Configuration
Three phase, five wire, wye connection, with neutral and ground.
(5 wire 3/N/PE AC 400V)
Load Regulation at Line Frequency
Wires are to be sized such that the line voltage drops from the
power source to the mobile unit is less then 2% of the nominal voltage
for the rated load of the mobile unit.
Frequency
50 Hz + 0.5 Hz.
Phase balance: 2% maximum of lowest phase-to-phase voltage.
Maximum Voltage Variation: + 5% from a nominal steady state (under
the worst case conditions of line voltage).
Connector type
The mobile unit is supplied with a 35'-0" (10.668m) useable
power cable and male conductor. AMIS scanners come equipped with
both Marechal DS2 and Lewden PM125/808 type male connectors. The
Lewden connector is a version of the CeeForm CEE 17 125A 400V (red)
connector.
Customer Facility
The customer facility must have the matching receptacle. Unless
otherwise specified, the receptacle type to be used must be either
a Marechal DS2 or the CEE17 125A female connectors.
Mobile Grounding Requirements
Ground Wire
An insulated ground conductor sized in accordance must be installed
between the facility vault and the mobile system ground bus location
in the power distribution unit.
Special Ground Note
The mobile unit includes an earth driven ground rod within 5’-0” (1.524m) of the facility power receptacle.
A grounding cable of a minimum #1/0 AWG must be connected between the grounding rod and the grounding pin of the facility
power receptacle, and another cable to be kept as short as possible, and must not exceed 8’-0” (2.4384m) in
length. A separate grounding conductor must still be run with the phase conductors to the source of the power from the
grounding pin of the hospital power receptacle.
Additional Requirements
Radiation Shielding
Factors such as proximity to buildings, and occupancy of the
surrounding areas must be considered. The mobile unit has been designed
to provide radiation shielding for the areas adjacent to the procedure
room. A proprietary and highly effective lead shielding system is
installed in the gantry and patient prep room walls. Lead shielded
windows are installed in the patient prep and gantry room walls
and doors.
Water requirements
The mobile unit does not utilize a water tank. All water that is
needed is obtained through a facility connection. The facility connection
provides the needed water for both the humidifier and an onboard
sink. The mobile unit will be supplied with a ¾” (1.905
cm) diameter, 20’-0” (6.096m) long hose terminated with
a ¾” (1.905 cm) I.P.S male threaded hose connector
located on the drivers side of the mobile unit. The facility must
provide a ¾” (1.905 cm) female connector and a water
supply.
Telephone service
Two telephone lines are required for the operation of the mobile
unit: a normal telephone line to enable the scanner to communicate
with the hospital, and (optional) a dedicated direct line of modem
connection. In the trailer belly compartment, there is a Hubbell
phone connection socket. An adaptor must be provided to connect
from the local phone socket to the Hubbell.
Site Checklist
This checklist is provided to help you prepare your site for the mobile unit. If for any reason you cannot meet these
points contact AMIS for possible alternatives.
- Trailer access route determined.
- Trailer exit route determined.
- Tractor access checked.
- Service access clear around trailer.
- Support pad.
- Communication lines.
- Electrical service checked and meets specs.
- Grounding checked.
- Mains impedance checked.
Mobile CT Drawings
Download a complete Mobile CT Unit site planning guide. - 4 minute download.
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