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PET/CT SITE PLANNING & INSTALLATION GUIDE

Home > PET/CT Site Planning & Installation Guide

1. The Four Critical Spaces

PET/CT site planning requires orchestrating four distinct environments to ensure radiation safety and efficient workflow. Each environment serves a specific radioactive or clinical purpose, and proper spacing is required to prevent cross-contamination.

Space Minimum Recommended Size
Scanner (Gantry) Room 22' x 24' (528 sq ft) minimum
Control Room 10' x 12' (120 sq ft) minimum
Hot Lab / Radiopharmacy 8' x 10' (80 sq ft) minimum
Patient Uptake Rooms 8' x 10' per room (typically 2-3 rooms needed)

2. Scanner Room Design

The scanner room must accommodate the PET/CT gantry (which is typically bulkier and heavier than a standard CT due to the PET crystal detector rings). Maintaining adequate clearances and structural integrity is crucial.

  • Gantry Clearance: At least 3 feet of clear space around the gantry sides and rear is required for servicing and thermal dissipation.
  • Structural Loading: Gantry weights range from 5,000 to 8,000 lbs. Structural floors must be certified by a structural engineer to support this extreme point load.
  • Laser Alignment: Ensure the wall structures are completely rigid to prevent laser alignment drift over time.

3. Hot Lab / Radiopharmacy

The Hot Lab is a dedicated nuclear medicine facility where radiopharmacy operations occur. Because staff handle concentrated radioactive isotopes, radiation safety is the highest priority.

  • Lead-Lined L-Blocks: Positioned on countertops to protect technicians during radiopharmaceutical dose preparation and drawing.
  • Decay Storage: Lead-lined cabinets are required for safe decay-in-storage of radioactive waste materials.
  • Access Control: Secure entry using electronic cards or keypad locks to prevent unauthorized entry of patients and general staff.
  • Monitoring Systems: Equipped with active area radiation monitors and dose calibrators.

4. Uptake & Patient Resting Rooms

After receiving the radiopharmaceutical injection (typically F-18 FDG), the patient must rest quietly for approximately 60 minutes. Because the patient is now an active radioactive source emitting 511 keV gamma rays, uptake rooms must be designed carefully.

  • Reclining Stretchers/Chairs: Comfortably furnished to minimize muscle activity, which can cause false uptake on the PET image.
  • AV Monitoring: Audio and video systems so technologists can watch patients without entering the room.
  • Lead Lining: Walls must be lined with 1/4″ to 1/2″ of lead depending on adjacent occupancies.
  • Hot Restroom: Direct and private access to a dedicated patient restroom is mandatory for waste excretion.

5. Radiation Shielding for PET/CT

PET imaging utilizes 511 keV positron annihilation photons, which are far more penetrating than the 120-150 kVp X-rays of the CT subsystem. Standard CT shielding specs will fail to contain PET radiation.

511 KEV CHANGES EVERYTHING

PET imaging uses 511 keV annihilation photons — far more penetrating than the 120–150 kVp X-rays of the CT subsystem. PET/CT room shielding is typically two to three times what a standalone CT room requires. A planner who has only designed CT facilities will underestimate PET/CT shielding by a large margin.

Barrier Typical Lead Shielding Thickness
Primary Scan Room Walls 1/2″ to 1.0″ lead equivalent
Scan Room Doors 0.5″ lead equivalent
Uptake Room Walls 1/4″ to 1/2″ lead equivalent
Control Room Window Leaded glass (typically 1″ thick equivalent)

6. Patient Flow & One-Way Workflow

Proper patient flow is critical in PET/CT design to minimize cross-contamination and unintended radiation exposure. This is managed through a strict "One-Way" workflow design.

  • Cold Path (Pre-Injection): Reception, screening, and IV preparation. Patients are completely non-radioactive.
  • Injection Room: Dose administration occurs here, converting the patient into a radioactive source.
  • Hot Path (Post-Injection): Moving directly from the uptake room to the scan room, and then to the exit without passing through pre-injection waiting areas.
  • Separation: Radioactive patients must never mix with un-injected patients or general staff.

7. Electrical, Grounding & HVAC

PET detectors use sensitive scintillation crystals (like LSO or LYSO) which are extremely sensitive to temperature and humidity changes. Power fluctuations can permanently degrade PET detectors.

Parameter / Item Requirement (Must run 24/7)
Electrical Service Dedicated 480V, 3-phase power with 150-200 amp capacity
Scan Room Temperature 68°F – 72°F (fluctuation must not exceed ±2°F)
Relative Humidity Strictly 35% – 60% non-condensing
Uninterruptible Power Supply (UPS) Mandatory to protect crystal cooling systems during outages

8. IT, PACS & Project Timeline

PET/CT scans generate massive datasets combining metabolic (PET) and anatomical (CT) image files. High-speed, dedicated gigabit network lines to PACS and RIS are required.

Because of state radioactive materials licensing, medical physicist shielding reports, and Hot Lab equipment lead times, a standard fixed PET/CT install takes 16 to 26 weeks from contract signing to first patient scan:

  • Weeks 1-4: Physics shielding calculation and radioactive materials license application.
  • Weeks 5-12: Custom shielding construction, Hot Lab fit-out, and HVAC zoning.
  • Weeks 13-16: Physics shielding verification and license approval.
  • Weeks 17-22: Scanner delivery, mechanical rigging, and electrical connection.
  • Weeks 23-26: OEM calibration, physicist commissioning, and clinical training.

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Our project management team will walk your site, identify the complex Hot Lab and 511 keV shielding requirements specific to your space, and build a realistic budget.

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