1. Prepare the patient for the MR procedure by ensuring that there are no unnecessary
2. Prepare the patient for the MR procedure by using insulation material (i.e., appropriate
3. Insulating material (minimum recommended thickness, 1 cm) should be placed between
4. Use only electrically conductive devices, equipment, accessories (e.g., ECG leads,
5. Carefully follow specific MR safety criteria and recommendations for implants made from
6. Before using electrical equipment, check the integrity of the insulation and/or housing of
7. Remove all non‐essential electrically conductive materials from the MR system (i.e.,
8. Keep electrically conductive materials that must remain in the MR system from directly
9. Keep electrically conductive materials that must remain within the body RF coil or other
10. Position electrically conductive materials to prevent "cross points". For example, a cross
11. Position electrically conductive materials to exit down the center of the MR system (i.e.,
E‐2 Guidelines and References Expression MR400 Instructions for Use
metallic objects contacting the patient's skin (e.g., metallic drug delivery patches, jewelry,
necklaces, bracelets, key chains, et cetera).
padding) to prevent skin‐to‐skin contact points and the formation of "closed‐loops" from
touching body parts.
the patient's skin and transmit RF coil that is used for the MR procedure (alternatively, the
RF coil itself should be padded). For example, position the patient so that there is no direct
contact between the patient's skin and the body RF coil of the MR system. This may be
accomplished by having the patient place his/her arms over his/her head or by using elbow
pads or foam padding between the patient's tissue and the body RF coil of the MR system.
This is especially important for those MR examinations that use the body coil or other large
RF coils for transmission of RF energy.
electrodes, et cetera), and materials that have been thoroughly tested and determined to
be safe and compatible for MR procedures, as listed in this IFU.
electrically‐conductive materials (e.g., bone fusion stimulators, neurostimulation systems,
all components including surface RF coils, monitoring leads, cables, and wires. Preventive
maintenance should be practiced routinely for such equipment.
unused surface RF coils, ECG leads, cables, wires, et cetera).
contacting the patient by placing thermal and/or electrical insulation between the
conductive material and the patient.
transmit RF coil of the MR system from forming conductive loops. Note: The patient's
tissue is conductive and, therefore, may be involved in the formation of a conductive loop,
which can be circular, U‐shaped, or S‐shaped.
point is the point where a cable crosses another cable, where a cable loops across itself, or
where a cable touches either the patient or sides of the transmit RF coil more than once.
Notably, even the close proximity of conductive materials with each other should be
avoided because some cables and RF coils can capacitively‐couple (without any contact or
crossover) when placed close together.
not along the side of the MR system or close to the body RF coil or other transmit RF coil).