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Medical Devices and Hygiene Products

How electromagnetic wave protection works

Left: Without MRI protector Right: With MRI protector

The 64MHz and 128MHz RF pulses emitted by MRI heat up metals, which poses a risk to those with metal implants. MRI protectors are made of waterproof nylon material with a high-frequency electromagnetic shielding material called "MG Net" inserted inside. The MRI protector attenuates the RF pulses in the areas it covers by more than 80%, so although imaging is no longer possible, the risk of metal heating is greatly reduced.

MGnetについて

In addition, if the set imaging area (FOV) is smaller than the imaging target, the area outside the FOV will be folded back in the phase direction and displayed as an overlapping image. Since MR signals cannot be obtained from the area using the MRI protector, there are no folding back artifacts, and oversampling, phase direction conversion, or presaturation suppression pulse settings are not required. As a result, it is possible to reduce the imaging time.

※ When using an MRI protector, the signal strength may be weakened, resulting in some degradation of image quality.

Aliasing artifacts and the effect of MRI protectors

For large FOVs, aliasing artifacts do not appear, so oversampling settings are not required.

In the case of small FOV, aliasing artifacts will appear, so oversampling etc. settings are required.

When RF radiation was shielded by using MRI protectors on both arms, aliasing artifacts did not appear even with a small FOV.


MRI Protector Usage Examples

Examples of how MRI protectors can be used are as follows:

Examples of how MRI protectors can be used are as follows:
MRI Protector Type Examples of use
Common to all products
  • ①Reduces risk of burns from contact with the gantry, coils, cables, or from induced currents if a loop is formed around the body.
  • ②Reduces the risk of heat generation and discoloration caused by metal components contained in dyes such as tattoos.
Neck guard (neck area) For use with people with non-magnetic metals (cervical stents, metal wires, etc.) embedded in the neck
Best Fit Coat (Chest) (Chest to Lower Abdomen)
  • ①For use with people with non-magnetic metals (stents, sternum wires, artificial hip joints, etc.) implanted in the chest or lower abdomen
  • ②Reduces exposure to electromagnetic waves on the body except for the head and limbs
Roll Sheet A (Arms and Legs)
  • ①Used for people with non-magnetic metal plates embedded in their elbows, knees, etc.
  • ②RF reflection and shielding suppresses aliasing artifacts
Roll sheet B (partially covers the chest or abdomen) Used for lower abdominal examinations on patients with tattoos, stents, or sternal wires
Mittens (hands and feet)
  • ①For use by those who wear non-magnetic metal accessories (rings and nails)
  • ②For use with balloon switch users (risk of burns due to induced current when a loop is formed in the palm of the hand)
  • ③Used to suppress aliasing artifacts caused by RF reflection and shielding effects
Pants (lower abdomen)
  • ①For use with stents and coils in the pelvic region and non-magnetic metal implants in the hip joint
  • ②Reduces exposure of reproductive organs (testicles, uterus, ovaries) to electromagnetic waves, and is effective not only for MRI but also for high-frequency thermal therapy devices.

Note

Do not use on individuals with implanted devices such as pacemakers or ICDs that are not MRI compatible, as clinical trials have not been conducted.

Electromagnetic wave shielding materialMGnet