A stationary magnetic field cannot heat and burn patients.
Yes, this is true—but only if the patient is also stationary. Which they aren’t, usually; see 4. It’s true that the vast majority of MRI burns are not of this type, but I’m aware of some examples.
What you are referring to is radio frequency heating, caused not by the magnetic field but by the radio waves used to do the actual probing. You do not need to increase the RF power to make use of the increased resolution offered by higher magnetic fields.
Right, my phrasing in 4 is a bit bad. However, I’m not referring to RF in 1.
The magnetic field itself (at least in current machines) is not capable of burning the patient. TVMF (Time-varying magnetic field) MRI can cause eddy currents, but these are very small, and the primary danger from these is shocks and siezures, not burns. If the patient has electrically-conductive items in their body (implants, etc.) the magnetic field can also cause harm in that way, but this is usually not a problem since patients are screened for these types of implants beforehand.
TIL. My applied friends in the area are mostly working with lab animals, so maybe they just weren’t cautious enough with their own metallic items? Who knows.
Yes, this is true—but only if the patient is also stationary. Which they aren’t, usually; see 4. It’s true that the vast majority of MRI burns are not of this type, but I’m aware of some examples.
Right, my phrasing in 4 is a bit bad. However, I’m not referring to RF in 1.
The magnetic field itself (at least in current machines) is not capable of burning the patient. TVMF (Time-varying magnetic field) MRI can cause eddy currents, but these are very small, and the primary danger from these is shocks and siezures, not burns. If the patient has electrically-conductive items in their body (implants, etc.) the magnetic field can also cause harm in that way, but this is usually not a problem since patients are screened for these types of implants beforehand.
TIL. My applied friends in the area are mostly working with lab animals, so maybe they just weren’t cautious enough with their own metallic items? Who knows.