If an object has a deflection angle of more than 45 degrees, what is its MR Safety classification?

An object that has a deflection angle of more than 45 degrees is classified as MR Unsafe. The reasoning behind this classification is rooted in the safety potential of ferromagnetic materials in the MRI environment. The significant deflection angle indicates that the object is strongly affected by the magnetic field of the MRI scanner, suggesting it is made of ferromagnetic material which could become a projectile. Such projectiles pose risks not only to the equipment but also to patients and personnel within the magnetic field's vicinity.

In MR safety classification, an MR Safe object is non-metallic or non-ferromagnetic and poses no risk in the MRI environment, while MR Conditional objects require specific conditions or precautions for safe use. Since the deflection angle exceeds the critical threshold of 45 degrees, indicating strong magnetic attraction, the object cannot be reliably managed as MR Conditional and is identified explicitly as MR Unsafe. Thus, this classification is essential for ensuring the safety of the MRI setting.