9.3 Auxiliary and Patient Care Equipment
Key Takeaways
- Hot-lab auxiliary equipment (calibrated pipettes, fume hoods/laminar flow as required) supports accurate RP preparation and containment of volatiles and aerosols
- Patient-care devices—IV pumps, ECG, pulse oximetry, BP, glucose meters, O₂ delivery, defibrillator, lifts/transfer aids—must be available, functional, and within the technologist’s competence and departmental emergency protocols
- Xenon delivery systems require airtight administration and an activated charcoal (or equivalent) trap with saturation monitoring; aerosol systems need tight face seal and contamination control
- Exercise treadmills and pharmacologic stress setups integrate with ECG monitoring; crash cart/defibrillator readiness is non-negotiable for stress testing
- Rb-82 generators (e.g., Cardiogen-82® systems; Ruby-Fill®/related Rb-82 delivery platforms) require elution QC, infusion system checks, and strict adherence to manufacturer/license procedures for Sr-82/Sr-85 breakthrough
9.3 Auxiliary and Patient Care Equipment
Quick Answer: Non-imaging Domain IV also covers lab tools, patient monitors and emergency gear, Xe/aerosol delivery, treadmills, LSC, and Rb-82 infusion systems. Your job: correct setup, containment, basic function checks, patient safety, and stop-the-line when equipment fails.
Imaging cameras and dose calibrators do not stand alone. Safe nuclear medicine requires auxiliary devices that prepare doses, care for patients, deliver ventilation agents, and run specialized non-imaging assays.
Laboratory Auxiliary Equipment
Pipettes and Volume Measurement
Radiopharmacy and blood labeling depend on accurate volumes (kits, QC chromatography, cell labeling).
| Practice | Why it matters |
|---|---|
| Use calibrated micropipettes/syringes per SOP | Wrong volume → wrong concentration, failed RCP, bad labels |
| Match tip type and technique (forward/reverse pipetting as trained) | Viscous blood and solvents need correct technique |
| Do not mouth-pipette radioactive or biohazard materials | Contamination and exposure risk |
| Document calibration/maintenance when required | USP/lab accreditation expectations |
Fume Hoods and Containment
Chemical fume hoods and specialized radiopharmacy hoods (including laminar-flow or isolator systems where used) protect staff from volatiles (e.g., iodine vapor concerns), aerosols, and chemical fumes.
| Rule | Application |
|---|---|
| Work inside the sash plane | Keep contaminants in the hood |
| Maintain required face velocity/certification | Annual certification is common |
| Do not block rear vents with clutter | Airflow fails silently |
| Use for radioiodine handling and volatile steps as SOP requires | Reduces airborne contamination |
Trap: Performing volatile iodine work on an open bench because “it will be quick” is an ALARA and regulatory failure.
Patient Care Equipment
Nuclear medicine technologists continuously monitor patients during injections, imaging, and especially stress testing and therapy.
| Device | Role in NM | Tech responsibility (entry-level) |
|---|---|---|
| IV pump / infusion devices | Controlled pharmacologic stress agents, fluids, some RP infusions | Correct drug, concentration, rate, line patency; extravasation watch |
| ECG monitor | Stress testing, gated studies, arrhythmia surveillance | Lead placement, readable tracing, recognize when to stop and call for help per protocol |
| Pulse oximeter | Oxygenation during stress, sedation, respiratory compromise | Correct probe placement; respond to desaturation |
| Blood pressure cuff | Stress stages, recovery, symptomatic patients | Proper cuff size; stage-by-stage measurements |
| Glucose meter | Diabetics before FDG PET or prolonged NPO | Verify meter QC when required; know hypo treatment path |
| Oxygen delivery (cannula, mask) | Hypoxemia, ordered O₂ | Correct device/flow; fire safety near O₂ |
| Defibrillator / crash cart | Cardiac emergencies on stress or in department | Know location, code activation, BLS role; do not delay code for imaging |
| Lifts / transfer aids / stretchers | Safe transfers, fall prevention | Body mechanics; enough staff; lock wheels |
Safety culture: If ECG leads fail, SpO₂ is unreliable, or the defibrillator is missing from the stress lab, fix the line—do not start a treadmill stress “because the camera is free.”
Non-Imaging Procedure Equipment
Xenon Delivery and Trap
Xe-133 ventilation studies use a closed delivery system: patient breathes xenon for washin/equilibrium/washout while exhaust passes through a charcoal trap (or approved trap) that adsorbs xenon.
| Checkpoint | Why |
|---|---|
| Tight mask/mouthpiece seal | Leaks contaminate room air |
| Trap not saturated; replace per SOP/monitor | Saturated trap releases Xe |
| Negative-pressure room / exhaust as required | License and ALARA |
| Room survey after study as required | Detect residual airborne/surface activity |
Aerosol Delivery
Tc-99m DTPA aerosol systems nebulize particles for ventilation imaging. Goals: adequate lung deposition, minimal face/hair/room contamination.
- Check nebulizer kit integrity and oxygen/air flow per protocol.
- Ensure nose clips and tight seal; wipe face after administration if contaminated.
- High central airway deposition or room fog suggests technique/equipment problems.
Treadmill and Stress Hardware
Exercise MPI and other stress protocols require a calibrated treadmill (or bicycle), integrated ECG, BP capability, emergency O₂, and immediate access to a defibrillator and crash cart. Technologists coordinate with supervising personnel for test termination criteria (symptoms, ST changes, arrhythmias, patient request).
Liquid Scintillation Counting (LSC)
Liquid scintillation counters detect low-energy beta emitters (e.g., H-3, C-14, and some research/assay applications) by light produced in scintillation cocktail. They are not substitutes for NaI well counters for routine Tc-99m wipes. Know: quench correction concepts at a basic level, cocktail handling as chemical hazard, and that LSC is specialized laboratory equipment with its own QC.
Rb-82 Delivery Systems (Cardiogen-82®, Ruby-Fill®, and Related Platforms)
Rb-82 from Sr-82/Rb-82 generators is infused for PET MPI via manufacturer infusion systems (commonly referenced brand families include Cardiogen-82® generator systems and Ruby-Fill®/associated Rb-82 delivery platforms—know the functions, not marketing trivia).
| Responsibility | Content |
|---|---|
| Elution / infusion QC | Follow package insert for activity, volume, and Sr-82 / Sr-85 breakthrough limits before patient use |
| System checks | Line integrity, waste collection, dose calibrator assay of elution as required |
| Patient safety | Correct IV, no extravasation of high-activity PET doses; radiation protection for staff |
| Documentation | QC results, patient dose/time, generator status |
| Action on fail | Do not infuse if breakthrough or system QC fails; notify RSO/authorized user |
Trap: Treating Rb-82 like a unit-dose Tc-99m syringe without generator breakthrough checks.
Integrated Tech Responsibilities
- Pre-use checks — power, calibration stickers in date, disposables stocked, emergency equipment present.
- Infection control — clean ECG leads, BP cuffs, pulse-ox probes between patients; biohazard handling for blood-labeling gear.
- Radiation safety — hoods for volatiles, Xe trap monitoring, aerosol containment, spill kits near use areas.
- Competency limits — operate within training; escalate ACLS-level care to qualified responders while initiating BLS/code as trained.
- Failure response — broken treadmill, failed xenon trap, out-of-QC Rb-82 system, or nonfunctional defibrillator → cancel or postpone until safe alternatives exist.
Quick Matching Table
| Need | Equipment family |
|---|---|
| Precise kit/blood volumes | Calibrated pipettes/syringes |
| Volatile radioiodine work | Certified fume hood |
| Xe-133 ventilation | Delivery system + charcoal trap |
| DTPA ventilation | Nebulizer aerosol system |
| Exercise stress | Treadmill + ECG + emergency cart |
| Low-energy beta lab assays | Liquid scintillation counter |
| PET Rb-82 MPI | Generator infusion system with breakthrough QC |
| Symptomatic patient on table | SpO₂, BP, O₂, code activation path |
Non-imaging instrumentation mastery is operational safety: the right device, proven to work, used within protocol—every patient, every day.
During Xe-133 ventilation imaging, the charcoal trap is past its replacement interval and may be saturated. The primary risk is:
Before infusing Rb-82 from a Sr-82/Rb-82 generator system for PET MPI, which requirement is most characteristic of safe practice?
A stress laboratory’s defibrillator is checked out for repair and no replacement is available. The safest action before starting exercise MPI is: