GE Healthcare NM/CT 850 - NM/CT 860 Final Study

General Specifications and Site Readiness

General Specifications: GE is not responsible for installation of unmentioned equipment. The final study provides recommendations for equipment location, electrical wiring, and room arrangements based on site studies and customer wishes. Room dimensions may originate from previous layouts and may not be verified on site. Dimensions apply to finished surfaces. Actual configurations may differ from presented options. Any site modifications post-approval require GE investigation. Equipment layout indicates placement and interconnection; local requirements may impact placement. All installation work must comply with building regulations and safety standards.

Customer Responsibilities: The customer must prepare the site according to the final study specifications and a provided site readiness checklist. The GE Project Manager of Installation (PMI) will assist in ensuring checklist completion. A structural engineer must verify floor and ceiling design for system loads. The customer is responsible for layout of additional structural elements and installation methods. Load-bearing structures are the customer's responsibility.

Radio-Protection: Suitable radiological protection must be determined by a qualified radiological physicist according to local regulations. GE is not responsible for specification or provision of radio-protection.

Customer Site Readiness Requirements:

• Required Manuals: Product-specific Pre-installation Manual (refer to cover page).
• A mandatory component of this drawing set is the GE HealthCare Pre-installation manual.
• GE HealthCare Site Readiness Checklist (DOC2949061) and Worksheet (DOC2949068) are required for equipment delivery.
• Any deviations from drawings must be communicated in writing to and reviewed by the local GE HealthCare installation project manager.
• Arrange for rigging, special handling, or facility modifications for equipment delivery.
• New construction requires a secure area for equipment, power for test equipment, and restrooms.
• Provide for refuse removal and disposal.
• Minimize vibrations within the scan room; contract a vibration consultant/engineer if necessary.

Environment Specifications

Altitude: Operating altitude ranges from -150 m [-492 ft] to 4100 m [13451 ft].

Magnetic Field Specifications: Static field limits from the surrounding environment must be less than 1 Gauss in scan and operator rooms to avoid interference.

• Gantry: Ambient static magnetic fields < 1 Gauss; Ambient AC magnetic fields < 0.01 Gauss peak.
• Operator Console, Monitor, Magnetic Media: Ambient static magnetic fields < 10 Gauss.

Maximum Gantry Audible Noise Level: Less than 70 dB when measured at one meter from the nearest gantry surface during CT scan acquisition.

Background Radiation: Radiation sources must be suitably shielded, including waiting/injection areas and radionuclide storage/preparation areas ('Hot Lab'), as background radiation can affect calibration.

Vibration Specifications: System components are sensitive to vibrations in the 0.5 to 20 Hz range. A vibration consultant or qualified engineer should verify specifications and implement solutions. Install the system on a solid floor, away from vibration sources like parking lots, roadways, heliports, elevators, and hospital power plants.

Equipment Layout and Components

The document includes a layout diagram showing the placement of equipment in the Control Room and Exam Room. Key components include:

• Item 1: CT Gantry
• Item 2: NM Gantry (without collimators)
• Item 3: Patient Table
• Item 4: Power Distribution Unit (CT PDU)
• Item 5: GE Storage Cabinet
• Item 6: Operator Console
• Item 7: Collimator Cart
• Item 8: Xeleris 4DR Workstation
• Item 9: NM Host
• Item 10: ECG Monitor
• Item 11: 6 kVA UPS
• Item 12: Transformer for 6 kVA UPS
• Item 13: Main Disconnect Panel (MDP)
• Item 14: Power Input Distribution Box (PIDB)
• Item 15: Partial UPS
• Item 16: Lead Glass Viewing Window
• Item 17: Counter Top for Equipment
• Item 18: Optional Wall Protection from Collimator Cart
• Item 19: Minimum opening for equipment delivery specified (1422 mm x 2083 mm, reducible to 1100 mm with detector dismount).

A table details the heat output (BTU/h and kW) and weight (lbs and kg) for each component.

Exam Room Height: Finished floor to slab height is TBD; False ceiling height is 8'-9".

Radiation Protection Details

Shielding Requirements Scaling: A table provides multiplication factors based on kV and aperture size for scaling shielding requirements with changes in mAs.

Shielding Requirements: Compliance with local radiation protection and shielding regulations is the customer's responsibility. Barriers like walls, lead-shielded glass, and lead shields may be needed. Patients are sources of radioactivity, so distance from operator during uptake and acquisition should be maximized. Scatter-room shielding requires review by a qualified radiological health physicist, considering scatter levels, equipment placement, workloads, construction materials, access, and surrounding equipment.

Background Radiation: Shielding is required for all radiation sources, including waiting/injection areas and radionuclide storage/preparation areas, to prevent adverse effects on calibration. If background radiation in the scan room exceeds 0.1 mR/h (1 µGy/h), lead shielding is necessary.

Radiation Scatter Diagrams: Detailed contour plots illustrate radiation scatter levels (in µGy/scan) around the scanner for both body and head phantom scans. These diagrams, based on 140kV, 100mAs/scan, 1 sec, and 8x1.25mm aperture, show radiation distribution in X, Y, and Z axes (in meters). The document notes that actual measurements can vary by ±20% and provides a conversion factor: 1 mR = 8.69 µGy.

Radioactive Isotopes

Compliance with Nuclear Regulatory Commission regulations or similar country-specific requirements is mandatory when using radioactive isotopes. Early arrangement of regulatory compliance is recommended. Source materials, including calibration sources, must be obtained prior to installation, considering potential long delivery lead times and short half-lives.

Radioactive Isotopes for System Calibration:

• Basic Calibration: Isotopes to be used at site must be available for installation (e.g., Tc99m, Co57, Tl201, I131, I123, In111, Ga67, Xe133).
• Site must have a license for Tc99m, which will be available during installation.

Equipment Dimensions and Details

Detailed diagrams and dimensions are provided for various system components:

• Gantry with Patient Table: Shows side, top, and front views with dimensions and center of gravity (COG) for both CT and NM gantries, and the patient table.
• Power Distribution Unit (PDU): Provides top, front, and side views with dimensions, service area, and mounting rail information. Indicates air flow for convection.
• Customer Supplied Table and CT Console: Details dimensions and COG for Z440 and Z4 consoles.
• NM Host and Power Input Distribution Box (PIDB): Shows top, front, and side views with dimensions and COG.
• Collimator Carts: Provides side, front, and top views with dimensions.
• Partial Uninterruptible Power Supply (UPS): Details CT and NM UPS units with plan, front, and side views and dimensions.
• Main Disconnect Panel (MDP): Shows top, front, and side views with dimensions.
• Transformer for 480V Sites: Provides plan, front, and side views with dimensions.

Delivery Information

Customer/Contractor Responsibilities for Delivery: Provide an adjacent area for unloading, ensure sufficient dimensions for doors, corridors, and ceiling heights for equipment movement, ensure access routes accommodate equipment weights and transportation/lifting equipment, and make arrangements for unloading on public or private property.

Dimensions of Delivery with Dolly Transport Equipment:

Corridor/Elevator Minimal Dimensions (without 90-degree turns): Specified for each equipment type.

The gantry is shipped on a dolly with elevating casters.

Structural Notes and Details

Structural Notes: Wall-mounted units require customer-supplied supports. Floor slabs must be flat and level. Dimensions are to finished surfaces. For seismic regions, ensure supports span three members. Customers must provide floor penetrations and any non-standard anchoring. Floor drilling obstructions (e.g., rebar) must be handled by the contractor. The customer is responsible for performing floor/wall penetrations and ensuring no subsurface utilities are impacted. GE installers perform surface penetration operations only after customer validation and permit completion.

Structural Layout: Diagrams show the placement of CT Gantry baseplate, NM Gantry baseplate, Table Anchor plate, Collimator exchange plate, and Swing plate within the exam room.

Loading Distribution: Diagrams illustrate the weight distribution of the NM Gantry, CT Gantry, and Patient Table on their respective pads and wheels, including centers of gravity. Anchoring points (main and alternative) are detailed, specifying HILTI-HSL-3 M10/40 anchors for gantries and sleeve bolts for the table anchor plate.

Floor Specifications: Requirements include floor leveling area (595 cm x 334 cm), slope limits (< 13 mm over 4300 mm), flatness (< 5 mm over 1500 mm), single poured surface, minimum concrete cube strength (fc=4350 psi / 30 MPa at 28 days), and minimum floor thickness (140 mm). Concrete strength testing is the customer's responsibility.

HVAC and Heat Dissipation

Temperature and Humidity Specifications:

• In-Use Conditions (Exam & Control Rooms): Recommended temperature 22°C [72°F], max 26°C [79°F]. Recommended relative humidity 30%-60%. Temperature gradient ≤ 3°C/h [≤ 5°F/h]. Humidity gradient ≤ 5%/h.
• Storage Conditions: Temperature +4°C [+40°F] to +27°C [+80°F]. Relative humidity 20%-60%.
• Air Pressure: 700 hPA to 1060 hPa.
• Air Renewal: According to local standards. Note: Avoid installing air conditioning systems with water leakage risk above electrical equipment.

Heat Dissipation: A table details the maximum heat dissipation in kW and BTU/hr for the NM Gantry, CT Gantry, Patient Table, Power Distribution Unit, UPS units, and workstations.

Electrical Requirements and Connectivity

Connectivity Requirements: Local and remote connectivity are required for GE Healthcare's digital support. This includes connection to PACS and modality worklist, requiring network information and a live Ethernet port. Remote connectivity via InSite™ enables digital tools for equipment monitoring. Systems can connect via TLS over TCP Port 443 or Site-to-Site IPsec VPN tunnel. Customers must provide contact information for connectivity setup.

Electrical Notes:

• Aluminum or solid wires are not allowed. Wire sizes are for equipment use; larger sizes may be required by local codes.
• Color coding of wires is recommended. Conduit sizes must be verified by local codes.
• Convenience outlets should be located near the system control, PDU, and on each wall of the procedure room.
• General room illumination should use low wattage bulbs to avoid excessive heat.
• Cable ductwork and conduits should run direct. Conduit turns require large, sweeping bends.
• Ground wires must be sized as specified by GEHC if larger than code.
• Special grounding systems may be required.
• Maximum point-to-point distances must not be exceeded.
• Physical connection of primary power to GEHC equipment must be made by the customer's electrical contractor under GEHC representative supervision.
• GEHC conducts power audits; customer's electrical contractor must be available.
• Electrical contractor must provide knockouts, openings, and bushings. All power connections by electrician.
• Junction boxes, conduit, ductwork, switches, breakers, and cable tray are customer-supplied and installed.
• Conduit and duct runs require gradual sweep radius bends.
• Ductwork must be metal with removable covers, certified/rated for electrical power, and electrically/mechanically bonded.
• Openings in raceway and access flooring must be finished with grommet material.
• Electrical contractor to provide pull strings in conduit and raceway runs.
• Provide 10-foot pigtails at all junction points.
• Grounding is critical for equipment function and patient safety.

Electrical Layout: Diagrams illustrate the electrical layout, including main disconnect panel (MDP), power input distribution box (PIDB), CT/NM UPS, CT PDU, and operator console. An outlet legend specifies various outlet types and their requirements. Additional conduit runs are detailed.

Electrical Elevations: Diagrams show the vertical placement of electrical components within the exam and control rooms.

Power Requirements:

• Power Supply: 3 Phases+N+G, 380 to 480 VAC ± 10%, 50/60 Hz ± 3 Hz.
• Maximum Power Demand: 40 kVA.
• Average Power Demand: 8.8 kVA.
• Power Factor: 0.85 (120kV, 200 mA).
• Power supply should connect to an MDP. Supply cable voltage drops must be calculated.
• Power input must be separate from sources generating transients. All equipment must be powered separately.
• Phase imbalance: 2% maximum. Voltage variation at full load: 6%. Transients: < 1500 V peak.
• Inrush current can withstand up to 10 times the recommended circuit breaker rating.

Ground System: Equipotential grounding is required. Resistance between gantry ground and facility earth ground at MDP must not exceed 0.5 Ohm; total resistance to earth must not exceed 2 Ohm.

Cables: Power and cable installation must comply with the distribution diagram. Cables must be isolated and flexible, with color codes complying with standards. Signaling and remote control cables connect to MDP with 1.5m pigtails.

Cableways: Must protect cables against water, abnormal temperatures, temperature shocks, and allow for replacement. Metal cableways must be grounded.

Power Distribution: Details the Main Supply (3 phase+N) feeder and ground wire size requirements based on feeder length and voltage (refer to Feeder Table). Includes diagrams for Emergency OFF buttons, Remote ON/OFF, MDP, PIDB, and PDU. Table 1 lists GE Supplied Main Disconnect Panel (MDP) CAT numbers and Amps by region. Table 2 provides Feeder Table for minimum wire size (AWG or MCM / mm²) based on feeder length and voltage.

Grounding: A dedicated 1/0 [50 mm²] or larger insulated copper ground wire is required from the power source to the MDP and from MDP to the PDU, run in the same raceway.

Interconnections: Diagrams show typical cable management (conduit in floor), scan room warning light and door interlock schematic, and interconnections between system components (CT Gantry, NM Gantry, Patient Table, PDU, PIDB, UPS, MDP, NM Host) with cable lengths specified in meters and feet.