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The scanner needs a static field that's homogeneous over the region you're imaging. And magnetic fields can't be homogeneous outside the bore of a magnet, i.e
by version_five 5y ago
The scanner needs a static field that's homogeneous over the region you're imaging. And magnetic fields can't be homogeneous outside the bore of a magnet, i.e
in free space (Ernshaw's theorem maybe). So any portable scanner has to either have a small, locally homogeneous spot (see Blümich et al from the late 90s or what Schlumberger has done with borehole logging) or be some kind of bigger closed thing like the Hyperfine systems that a sibling post mentioned.
It's a very interesting field from a technical perspective, but there are fundamental physical principles standing in the way of making a portable scanner like an ultrasound
- hoseja 5y ago>The scanner needs a static field that's homogeneous over the region you're imaging. Does it? Couldn't you let go of that assumption with heaps of compute power?
- version_five 5y agoWhat would you do with the compute power? There are some ways to correct for field inhomogeneity, but there are also fundamental limits like shorter signal lifetimes (or analogously bandwidth requirements) in inhomogeneous fields that you can't really get around. It's always possible there will be some advance, but I'm not aware of compute power as any real bottleneck