Siemens 1.5T MRI Scanner

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Siemens 1.5T MRI Scanner
T2 mri cropped.png
Frequencies 64 MHz
Frequency Range 64 MHz - 64 MHz
Emission Designator
Location Worldwide
Short Description Radio signal used by MRI machines to excite protons and obtain their response.
I/Q Raw Recording Download file
Audio Sample

An MRI machine uses kilowatts of radio frequency to excite protons and obtain their response, not only a strong magnetic field. My signals were recorded within <50m from the MRI clinic. Most of the radio frequency field is probably concentrated inside the device, and the room can also be shielded.
We can't reconstruct images from these because the response signal is extremely weak. We also can't exactly extract the sounds of MRI from it's radio signal - they are emitted by gradient coils, not an RFRadio Frequency coil.


In 1.5T field, protons resonant frequency is 64 MHzMegaHertz (MHz) 10^6 Hz, but I received signal at approx. 63.7 MHzMegaHertz (MHz) 10^6 Hz - I think this is MRI self-calibration because resonant frequency changes proportionally magnetic field strength and we can't make field with ideal 1.5T strength.
Also, we can see frequency sweep - it's likely a line-by-line scan synced with gradient coils that linearly deform the magnetic field within the MRI.

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