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Published byDavid Holmes Modified over 4 years ago

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Portable Magnetic Resonance Devices

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NMR A spinning magnet in a magnetic field will precess Larmor frequency ω = γ B Resonance – absorb energy Radio frequency for nuclei Energy decay, relaxation times T1 spin-lattice T2 spin-spin

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Task 1 N uclear M agnetic R esonance What are the basic principles?

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MRI Need spatial information to form image Magnetic gradients RF pulse sequences Phase encoding

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Conventional MRI Uniform Magnetic field 1 part per million Field gradients superimposed to perturb field in defined way spatial information RF Pulse sequences image contrast combinations of relaxation times

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Task 2 M agnetic R esonance I maging How did NMR develop into MRI? What are the essential requirements?

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Hospital MRI Large - fills a room Expensive to buy ~£1M Expensive to run ~£100k p.a.

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Hospital MRI Superb images High resolution Multipurpose

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Idea – Portable! Permanent magnet Natural inhomogeneities (But not too much!) Local relaxation times (0D) images (1D, 2D, 3D)

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Portable MR Small - suitcase? Cheap - ~£10s thousands Tailored for specific applications?

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Task 3 M agnetic R esonance I maging Are there any uses for small (portable) MR devices? Work out the design specifications You might require for these applications.

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Task 4 M agnetic R esonance I maging How can we make it small? Can you devise ways of meeting the design criteria of Task 3?

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Task 5 M agnetic R esonance I maging Can you identify devices in which others have attempted to meet the challenge?

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Aachen http://www.nmr-mouse.de/ the MObile Universal Surface Explorer or the NMR-MOUSE ® Bernhard Blümich http://www.aixnmr.com/

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Berkeley http://waugh.cchem.berkeley.edu/research/index.php?rescat=8 http://chemistry.berkeley.edu/Publications/news/spring2005/nmr.htm Portable High-Resolution NMR Sensor

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Principles of MRI Some terms: – Nuclear Magnetic Resonance (NMR) quantum property of protons energy absorbed when precession frequency.

Principles of MRI Some terms: – Nuclear Magnetic Resonance (NMR) quantum property of protons energy absorbed when precession frequency.

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