3 ms·

MRIs do not admit the same kind of radiation that radio towers, TV, antennas, cell phones, and other devices do. MRIs admit magnetic fields. Magnetic fields alo

MRIs do not admit the same kind of radiation that radio towers, TV, antennas, cell phones, and other devices do. MRIs admit magnetic fields. Magnetic fields alone. And The typical MRI worker is not commonly in the magnet room during scanning; therefore she is only occasionally exposed to gradient or radiofrequency fields. Plus, there are several regulations regarding exposure to fields from MRIs. So this is comparing apples to bumblebees as far as health risks go. https://mriquestions.com/personnel-exposure.html https://mriquestions.com/personnel-exposure.html

billfor 3y ago
An MRI emits RF fields as well to snap back the magnetic field. That's the banging noise that you hear when you are inside an MRI. https://mriquestions.com/radiofrequency-waves.html https://mriquestions.com/radiofrequency-waves.html
scythe 3y ago
I am a medical physicist. I know how the MRI works. The goal of the MRI machine is to make the patient's body emit radio waves, which are then measured. Obviously there is some RF going on! (This corresponds to a spatial Fourier transform etc.) And while it might not seem "often" to you, it's worth considering that the RF levels in the room are enough that we care about tissue heating and sparks on nonmagnetic conductors. This is many thousands of times stronger than a TV signal. There are many cases where the patients require "assistance", which is used in roughly the same sense that cats require assistance in taking a shower. Then there are spectrometrists and so forth — not every MRI is like the one you get as an outpatient with a broken leg.
- methou 3y ago
  I think people could measure the forward/reflected energy at home, do sum calculations, it shouldn't be very hard, unsure why there's no such a product available.
methou 3y ago
MRI uses quite a lot RF, the coils are tuned to the B0 field frequency, there's a TX as well as RX. Commonly TX freq as at 63.87Mhz (1.5T) or 127.74 MHz (3.0T). While most of the workers are well shielded from the room, but people have to be extra careful to not microwave heat your patient to much (usually +1C hotter). But don't worry too much, there's a SAR limit on it. Most of the RF components, equipment, including our phones, are all strictly regulated by SAR (specific absorption rate). Each of them might be safe, but if you are having too many of them around you can be a problem (?).

billfor 3y ago

An MRI emits RF fields as well to snap back the magnetic field. That's the banging noise that you hear when you are inside an MRI. https://mriquestions.com/radiofrequency-waves.html https://mriquestions.com/radiofrequency-waves.html

scythe 3y ago

I am a medical physicist. I know how the MRI works. The goal of the MRI machine is to make the patient's body emit radio waves, which are then measured. Obviously there is some RF going on! (This corresponds to a spatial Fourier transform etc.) And while it might not seem "often" to you, it's worth considering that the RF levels in the room are enough that we care about tissue heating and sparks on nonmagnetic conductors. This is many thousands of times stronger than a TV signal. There are many cases where the patients require "assistance", which is used in roughly the same sense that cats require assistance in taking a shower. Then there are spectrometrists and so forth — not every MRI is like the one you get as an outpatient with a broken leg.

methou 3y ago
I think people could measure the forward/reflected energy at home, do sum calculations, it shouldn't be very hard, unsure why there's no such a product available.

methou 3y ago

MRI uses quite a lot RF, the coils are tuned to the B0 field frequency, there's a TX as well as RX. Commonly TX freq as at 63.87Mhz (1.5T) or 127.74 MHz (3.0T). While most of the workers are well shielded from the room, but people have to be extra careful to not microwave heat your patient to much (usually +1C hotter). But don't worry too much, there's a SAR limit on it. Most of the RF components, equipment, including our phones, are all strictly regulated by SAR (specific absorption rate). Each of them might be safe, but if you are having too many of them around you can be a problem (?).