Vibration
TRUE/FALSE: Vibration can affect image quality?
TRUE
TRUE/FALSE: The amount of acoustic vibration attenuation by the Vibro-Acoustic Dampening kit is site dependent?
TRUE
A continuous supply of facility liquid coolant must be supplied to what?
The Integrated Cooling Cabinet (ICC) or Heat Exchange Cabinet (HEC)
Does GE approve of splicing grounding or feeder conductors? Y/N..AND what should never be used?
No, Splice bolt should NEVER be used
How much does each Vibro-acoustic Dampening Mat weigh?
Approximately 250lbs (~105kg)
When must vibration test be performed?
Early in the site planning process
Structure borne acoustic issues tend to occur where in the facility?
Above the ground floor of the facility
To avoid overheating patients, the chiller air is required to meet a surface temperature limit of?
24 degrees Celsius
TRUE/FALSE: Using the existing MDP/PDB for the Signa Explorer/Creator will power the new chillers?
FALSE
Will need to plan for a separate MDP/PDB for chillers.
Are there optional leveling pads for the surface mounted HM & UA magnets?
Yes, there are four green pads
Name the two types of vibrations?
Steady state & transient vibrations
Is it the GE PMI's decision concerning the impact of vibration for evaluation & design?
No, it is the customer’s & their acoustic design engineer’s responsibility
What is the size of the customer supplied feeder hose from main water supply to the HEC?
1.5 inch (38.1mm) minimum hose inside diameter
Is there a difference in power demand for the GE magnets and why?
Yes, because of the different cooling options. Check the PIM
Provide 3 reasons for the optional green leveling pads to be used?
1.) fills small gaps between the bottom of the foot & floor contact surface when not in the same plane.
2.) Self-level the magnet.
3.) Adds additional isolation between foot & plate.
Who is responsible for conducting a vibration test AND if told not needed then what?
The customer is responsible for vibration testing AND if they say it’s not needed then the GE PMI needs to ask for documented summary, test method used & stamped with PE
Describe the purpose of an Acoustic room?
A layer used to help attenuate or contain noise during a scan.
What is the minimum & maximum flow for facility liquid coolant required to the HEC?
Minimum is 30 gpm (114L/min)
Maximum is 35 gpm (132L/min)
Power to the cryo compressor for the DV systems is wired to what?
To the HEC
The cryo compressor is phase sensitive of L1,L2,L3 must connected appropriately by the contractor
What is the purpose of a 3x3 washer, SS stud, SS Nut & flat washer & where on the dampening mat?
1.) To secure the magnet foot
2.) Located inside the magnet foot
Name 3 steady state & 3 transient vibrations that cause IQ issues?
Steady State - exhaust fans, A/C, pumps
Transient vibrations – traffic, pedestrians, slamming doors
What are the two options to mitigate structure borne acoustic transmission?
1.) Provide vibro-acoustic surface mounted dampening kit
2.) Customer may design & implement
The PGR cabinet is critical for proper operation & exhaust air clearance. What is the minimum space distance from the wall & side of the cabinet?
4 inch (102mm) minimum space distance from the wall and 15 inch (380mm) minimum space distance at the side of the cabinet.
What is the wire size for the emergency-off circuit on the Discovery 450 AND who supplies the wire?
Wire size is 12-22 AWG and supplied by the customer.
If the optional 4 green leveling pads are used, how much will the magnet centerline be raised & provide the minimum/max. distances?
1.) Approximately 3mm
2.) The pads should be between 1064mm and 1076mm