The Physics of Magnetic Resonance Imaging Safety

Area of Science:

• Medical Imaging Physics
• Biomedical Engineering
• Radiological Safety

Background:

• Magnetic resonance (MR) imaging employs static, gradient, and radiofrequency magnetic fields to create detailed anatomical images.
• The powerful magnetic fields in MR scanners pose potential risks to patients and individuals with magnetically sensitive implants or devices.
• Understanding the physical principles governing MR imaging is essential for ensuring a safe examination environment.

Purpose of the Study:

• To review the fundamental physics underlying the primary risks associated with MR imaging.
• To enhance comprehension of patient and material interactions within the MR environment.
• To support the development of effective risk management strategies in clinical MR settings.

Main Methods:

• Review of established physics principles relevant to MR imaging.
• Analysis of electromagnetic field interactions within the MR environment.
• Discussion of potential hazards arising from magnetic and conducting materials.

Main Results:

• The interaction between MR magnetic fields and biological tissues or foreign materials can lead to significant safety concerns.
• Specific risks include projectile effects, heating, nerve stimulation, and device malfunction.
• A foundational understanding of MR physics aids in predicting and mitigating these risks.

Conclusions:

• Knowledge of MR imaging physics is paramount for ensuring patient safety and effective risk management.
• Implementing safety protocols based on physical principles minimizes adverse events during MR examinations.
• This review aims to build intuition for navigating the complexities of the MR environment safely.