MR Safety Leadership & Assistant Responsibilities

The Institutional MR Safety Leadership Triad

The ACR Guidance Document on MR Safe Practices recommends establishing an institutional safety governance structure known as the Safety Leadership Triad. This structure ensures that administrative, clinical, and physical safety questions are resolved through specialized expertise.

                    ┌──────────────────────────────────┐
                    │   MR Medical Director (MRMD)     │
                    │  (Licensed Radiologist/Physician) │
                    └─────────────────┬────────────────┘
                                      │
                 ┌────────────────────┴────────────────────┐
                 ▼                                         ▼
┌──────────────────────────────────┐     ┌──────────────────────────────────┐
│    MR Safety Officer (MRSO)      │     │    MR Safety Expert (MRSE)       │
│ (Lead Technologist / Operations) │     │ (Medical Physicist / Consulting) │
└──────────────────────────────────┘     └──────────────────────────────────┘

MR Medical Director (MRMD)

The MR Medical Director is a licensed physician—typically a board-certified diagnostic radiologist—who holds overall clinical, administrative, and regulatory responsibility for the safe operation of the MR facility.

• Key Responsibilities:
  • Formulating, approving, and signing all institutional MR safety policies, clinical imaging protocols, and emergency procedures.
  • Establishing medical criteria for screening, renal function assessment, and gadolinium contrast administration.
  • Serving as the final clinical arbiter for determining whether to scan patients with high-risk, ambiguous, or complex MR Conditional medical implants when manufacturer guidelines cannot be strictly satisfied (risk vs. benefit clinical determination).
  • Ensuring the facility complies with ACR, Joint Commission, and federal regulatory safety mandates.

MR Safety Officer (MRSO)

The MR Safety Officer is a designated clinician or safety specialist—frequently a lead ARRT-registered MR technologist or clinical medical physicist—who manages the daily operational execution of MR safety practices.

• Key Responsibilities:
  • Serving as the immediate, on-site clinical resource for technologists and imaging assistants facing complex screening questions.
  • Reviewing manufacturer Instructions for Use (IFU) and technical documentation for MR Conditional implants to verify that scanner conditions match device constraints.
  • Investigating and documenting all safety events, near-misses, projectile incursions, and equipment failures; leading root-cause analyses (RCA).
  • Enforcing suite screening workflows, physical access controls, and gowning compliance.
  • Maintaining training records to confirm all departmental personnel complete mandatory annual safety competencies.

MR Safety Expert (MRSE)

The MR Safety Expert is a technical consultant—typically a board-certified diagnostic medical physicist (ABR, ABMP) or specialized MR research scientist—who provides advanced physical, electromagnetic, and engineering guidance.

• Key Responsibilities:
  • Providing technical analysis regarding radiofrequency power deposition, Specific Absorption Rate (SAR) limits, and tissue heating risks for non-standard patient configurations.
  • Modeling electromagnetic field interactions for abandoned pacemaking leads, extensive surgical hardware, or high-field 3.0T/7.0T applications.
  • Advising facility architects and engineers on passive magnetic shielding, active bucking coil efficacy, and assessed fringe-field containment during suite construction or equipment replacement.
  • Evaluating acoustic noise generation, gradient switching vibrations, and cryogenic exhaust venting systems.

Imaging Assistant Tasks, Training and Scanning Authority

The I.A.(MR) role supports MR Level 2 safety, patient care, positioning and contrast tasks. Credentialing does not automatically assign every facility privilege: the MRMD establishes role-specific safety training and the employer documents competency and task authorization under applicable law. Being Level 2 MR Personnel is not the same as being an MR technologist, nurse or prescribing clinician.

An assistant may collect screening information, retrieve device records, prepare and position patients, inspect coils, set up approved equipment and communicate concerns within their authorized role. The assistant does not produce images: protocol/parameter selection and data acquisition remain outside the role. ARRT's clinical document includes venipuncture and preparation and/or administration of contrast, and preparation/activation of a power injector where used. Do not replace these provisions with a blanket prohibition on all contrast tasks; do not mistake them for unrestricted permission to inject without orders, competency and required supervision.

Remote competency verification and remote scanner operation are different. ARRT permits live video/audio observation for specified safety, positioning and QC competencies, but general patient-care verification is in person. In remote scanning, a qualified technologist operates the scanner. The 2026 ACR manual recommends an on-site Level 2 MR technologist and additional MR personnel, including a dedicated on-site Level 2 monitor for each patient in Zone IV. An assistant alone does not satisfy that recommended staffing model. Local policy must define who responds, who controls access and what happens if communication is lost.

If an assigned task exceeds training or authorization, explain the concern, keep the patient safe and obtain a qualified team member. A busy schedule, an instruction from a colleague, or familiarity from watching a procedure is not competence or permission to scan.