[Guestmodinfo]

MRI is done using X rays which have very very small wavelength compared to sound. And resolution of images i.e. less blurry varies inversely proportional to the wavelength. Yes some algo can make slightly better but I am certain that nothing can beat x rays in clarity for humans

[FeteCommuniste]

MRI uses RF wavelengths, which are measured in meters. Ultrasound waves are measured in fractions of a millimeter. Wavelength is not the relevant factor here.

[jandrewrogers]

You are thinking of CT scans. MRIs use strong magnetic fields and MHz-range radio waves.

[elric]

No X rays are involved in MRI.