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Researchers hope to deploy the device to the International Space Station to study the effects of space travel on humans

While mankind has been sending men and women into space for the past five decades, the effects of spaceflight on the human body are still only partially understood.  One key obstacle is that many forms of high-resolution medical scanning equipment is too bulky and heavy to transport into space for use in orbiting space stations.

I. Bringing an MRI up to the ISS?

A key example is the magnetic resonance imaging (MRI) machines.  On Earth they provide the capability to image tissues at a fidelity not possible with other types of scans.  A typical MRI machine costs around $1M USD and weighs about 11 tons due to its bulky liquid-helium cooled superconducting magnets.  Also a traditional MRI could endanger space state residents -- its gradient coils consume massive amounts of power in short bursts and the magnets can create stray magnetic fields that could disrupt life support and other mission-critical systems.

The chairman of the Canadian University of Saskatchewan's Biomedical engineering department hopes to change that, though.  Chairman Gordon Sarty heads a team that has developed a miniature version of the scanner that weighs less than a ton and costs as little as $200,000.

Micro MRI
A full-size mockup of Professor Sarty's reimagined MRI
[Image Source: Gordon Sarty / University of Saskatchewan]

An initial deployment to the International Space Station (ISS) may involve a 1/20th of a ton device, only capable of scanning limbs, to study bone mass and vasculature.  However, Professor Sarty would like to build a full size scanner for the station eventually.  He comments in an NBC News interview, "I would like to build a facility-class, whole-body-sized MRI.  Such a project would require an agreement between the ISS space agencies."

II. Initial Findings Look Promising

At the American Institute of Aeronautics and Astronautics' Sept. 13 AIAA Space 2012 conference Professor Sarty and his team presented their findings.

Their instrument employs a couple of key advances.  First, it utilizes a permanent Halbach magnet -- the primary source of the large weight reduction.  Halbach magnets are a construct of permanent magnets arranged in an array such that they increase each other’s magnet fields within one region and nullify it within another.  In a cylindrical configuration -- a configuration being explored for both motor applications and imaging equipment like Professor Sarty's micro-MRI -- in the ideal case there is an intense field within the cylinder and virtually no field outside of it.

Halbach magnet
A Halbach magnet [Image Source: PERDaix]

Thus the Halbach magnet cylinder also solves a couple of the other issues as it draws no power and produces minimal magnetization outside the cylinder.  To further reduce power, the coil system is modified to only need the radiofrequency coil -- a design called the Transmit Array Spatial Encoding (TRASE).

While the result may be tailor-fit for space applications, Professor Sarty says its qualities like reduced weight and low power consumption could make it well suited for terrestrial applications, as well, such as battlefield deployments (the device could be loaded aboard a truck and run off of batteries).

ISS wide
The final target deployment is the ISS. [Image Source: NASA]

While conference attendees reportedly urged Professor Sarty to set his eyes on these earthbound applications first, he has his sights firmly set on space and is lobbying the Canadian Space Agency to deploy a prototype to the ISS.  He comments, "Eventually someone will break a bone in space.  We have no idea if that bone will heal."

Source: NBC News

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RE: terrestrial applications
By mugiebahar on 9/23/2012 12:53:01 PM , Rating: 1
Agreed, how this could nt be the obvious choice is stupid. It's funny how we make something cheaper and the first place we want to use it in space, that's just screwed up. How about struggling families who can't afford MRIs or caner patients who have but mere months/ days to live? We deserve to die as a people. If we can't take care of the poor/unfortunate/sick why do we think its ok to waste money going to space or better put living. People say survival of the fittiest that's natures way, but we are thinking, intelligent beings why do we use those attributes and care for people.

RE: terrestrial applications
By Master Kenobi on 9/23/2012 4:00:05 PM , Rating: 4
While I agree with your premise, even I admit that when it comes to Space, you get people on the better end of the gene pool. Most people interested in space are pioneers, and are looking ahead to the future. If this guy tried to market this to a terrestrial application he would get nowhere, but by choosing space, he gets recognition for being the first at something, as well as no companies motivated to stop him, and governments that want it. Win, win, and more win.

You want to know why medical advancements to make things CHEAPER, or EFFECIENT don't happen very often? Because it doesn't earn the companies more money. Ever wonder why Razors aren't made to literally last forever, or that there isn't a quick and easy way to permanently kill hair folicles? Because a multi-billion dollar industry would evaporate over night. There is good money to be made in prolonging a problem with a half-assed, inefficient solution.

Off Topic: We can invest tons of money into regrowing hair or transplanting it, but god forbid we find a way to permanently get rid of it, that might actually make financial sense for consumers, but wreck many corporations' cash cow that they have been milking since the stone age.

RE: terrestrial applications
By nafhan on 9/24/2012 10:29:24 AM , Rating: 3
I'm missing the part where using it in space means we can't use it on Earth. I feel like the opposite would actually be true. Let me explain:
While the per unit cost of these things promises to be much lower than current machines, there's obviously significant R&D going into turning this into a functioning product. If a national space program pays for that R&D, "poor/unfortunate/sick" people will be able to start using the new machines sooner NOT later.

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