Philips MR5300 1.5T MRI System: Room Requirements

Introduction

This document provides users and contractors with essential technical requirements for selecting a room and assessing the feasibility of installing the Philips MR5300 1.5T MRI system. It covers critical aspects of site preparation, equipment specifications, and environmental considerations to ensure optimal performance and safety.

Key Room Selection Criteria

1. A dedicated power line from a transformer (TP / TPS) is required.
2. Consider proximity to elevators, electrical rooms, roadways, and metro lines.
3. The floor's load-bearing capacity must be verified, with limitations on metal content in the floor.
4. Areas with magnetic field induction of 0.5 mT and above, extending beyond the procedural room, must be accounted for.
5. The total power requirement for the facility is determined by the UPS system, potentially requiring a higher UPS capacity due to peak currents.
6. The MR5300 BlueSeal system does not require a helium emergency vent pipe.

Recommended Room Dimensions and Layout

• Procedural Room: 7000 x 4800 mm
• Operator Room: 3000 x 4800 mm
• Technical Room: 3000 x 5100 mm
• Recommended ceiling height: 3000 mm (floor to ceiling slab)

Rooms with smaller dimensions may present mechanical limitations and operational challenges.

Equipment Layout and Specifications

The following diagram illustrates a typical equipment configuration. It serves as a general guide for design. Site conditions, customer preferences, and equipment configuration may influence room geometry and layout. Consult Philips for specific site drawings during early design stages.

Diagram Description: A top-down view of an MRI suite layout showing the procedural room, operator room, and technical room. Magnetic field exclusion zones (0.1mT, 0.3mT, 0.5mT, 1mT, 3mT) are indicated around the MRI scanner. Key areas are labeled with numbers corresponding to equipment specifications.

Magnetic Field Exclusion Zones:

• Zone A: Area with restrictions on ferromagnetic objects (e.g., beams, columns, channels). Size: 3000x3000x3000 mm. The center is the isocenter of the MRI. Reinforcement and other metallic elements within 50 mm depth must be absent.
• Zone B: Minimum area for installation and subsequent service.
• Zone C: Magnetic field induction zone of 0.5 mT. Controlled access area.
• Zone D: Cold water supply (Ø20 from floor), sewage (Ø50 from floor), floor drain (Ø50).
• Zone E: Recommended unloading area.

Side and Cross-Sectional Views

Side View: Depicts the MRI scanner and its associated magnetic field exclusion zones. It emphasizes the prohibition of individuals with pacemakers within the 0.5 mT magnetic field zone.

Schematic Section A-A: Shows a cross-section of the MRI room, indicating the scanner, Faraday cage, and magnetic field exclusion zones. It highlights the 0.5 mT controlled access area.

Schematic Section B-B: Illustrates another cross-section, detailing the Faraday cage, room boundaries, and the 0.5 mT controlled access area.

Diagram: A schematic for checking ferromagnetic object placement within a 3x3 meter area around the MRI isocenter. It specifies distances and orientations relative to the magnet's axes (Z, X, Y) and provides a graph illustrating minimum distances from the isocenter to moving ferromagnetic objects of varying weights.

Ferromagnetic Object Placement Guidelines:

• Avoid placing significant metal masses, transformers, high-power electrical equipment, elevators, and electrical cables near the procedural room.
• Vehicles, trams, etc., moving in close proximity to the MRI suite can also have an undesirable influence.
• Structural metal beams should be at least 2.5 meters from the apparatus center.
• Floor coverings should be free of ferromagnetic materials.
• Specific distances are provided for objects with weights ranging from 25 kg/m² upwards, depending on their orientation relative to the Z-axis.

Placement Recommendations and Comments

1. Do not locate the MRI procedural room adjacent (horizontally or vertically) to wards for pregnant women, children, cardiac patients, or rooms for round-the-clock patient stays. Individuals with pacemakers must not be in areas with magnetic field strength of 0.5 mT or higher. The isocenter height is 1.004 m.
2. Avoid installing the scanner directly beneath rooms with potential water leakage through ceilings.
3. Do not place significant metal masses, transformers, high-power electrical equipment, elevators, or electrical cables near the MRI procedural room. Also, avoid proximity to moving vehicles like cars, trams, etc. Refer to the diagrams on page 3 for verification.
4. Avoid utilities under the floor or between walls and the Faraday cage, as access will be impossible after installation, and they can affect equipment operation.
5. Do not locate the MRI suite in areas influenced by utilities such as elevators, power lines, tram lines, or the metro. In such cases, assess the risk of magnetic field impact with a certified organization or the manufacturer.
6. Ensure transport routes for the MRI are planned. Typically, a temporary transport opening of 2.5m x 2.5m (WxH) is made in the procedural room wall.
7. Provide a temporary unloading area of 3m x 3m above the procedural room level. The threshold height between the unloading area and the procedural room depends on the Faraday cage floor thickness.
8. The total weight of the Faraday cage is approximately 5-7 tons, distributed.

Heating, Ventilation, and Air Conditioning (HVAC)

Philips provides a climate control system that ensures the required air exchange and microclimate specifically for the MRI procedural room and technical room. Installation of the external climate control unit (chiller) requires approximately 3.3m x 1.6m x 1.8m (WxDxH) space and weighs around 1000 kg. Recommended chiller placement is near the technical room, outside the building, or on the roof as agreed with Philips. Additional climate control equipment is not required.

Other rooms within the MRI complex (e.g., operator room, preparation room) are not connected to the climate control system. Air exchange in these areas should be provided according to relevant documentation.

Power Supply Requirements

• Power supply scheme: Star, 5-wire, TN-C-S (3 phases, neutral, protective conductor).
• Allowable voltage fluctuations: +10% / -10%.
• Supply voltage: 380/400 V.
• Mains frequency: (50±3) Hz.
• Phase-to-phase resistance for MR5300 system: not more than 0.20 Ohm (parameter to be checked at the MRI disconnect switch in the technical room before installation).
• Total power for the MR5300 MRI system: 60 kVA, Nominal current: 90 A.
• Peak current: 400A (for max 5 ms), 500A (for max 1 ms), Power factor = 0.9.
• Climate control system power: approx. 50 kVA, Nominal current: approx. 90 A.

Two separate power feeds are necessary: one for the MRI system and one for the climate control system.

For the MRI, power must be supplied from the transformer substation via a UPS, with cable cross-section sufficient for maximum power consumption, equipment current, and phase-to-phase resistance not exceeding requirements. This dedicated line should only power Philips equipment. Power and grounding cables should be routed to the location specified in the room preparation plan. Allow at least 2 meters of free cable ends. Bottom cable entry is recommended.

The medical device grounding system must comply with local legislation and standards. The grounding loop should connect to the main building grounding bus. Grounding resistance should not exceed 1.5 Ohm.

Lighting within the MRI procedural room is provided by the Faraday cage manufacturer. Ensure adequate lighting in the operator and technical rooms according to current standards. Due to the numerous utilities on the technical room ceiling, wall-mounted lighting is recommended.

Storage and Handling Conditions

The equipment is delivered in large crates (approx. 50 units, total weight ~22 tons). Arrange and agree on a temporary storage location with the Philips Healthcare project manager, close to the installation room. Storage conditions must prevent exposure to atmospheric precipitation, low, and high temperatures.

Uninterruptible Power Supply (UPS)

The UPS is typically supplied in two cabinets. Due to high heat dissipation, it is recommended to place the UPS in the MRI technical room. This allows the climate control system to manage the heat generated by the UPS.

If space in the technical room is insufficient for the UPS, it can be placed in a separate room with forced cooling, adjacent to the electrical room. In this scenario, a climate control system for the UPS heat dissipation will need to be planned. No additional ventilation requirements for this equipment from Philips exist; ventilation should be designed according to current standards.