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Medicine has come a long way, but it’s still not quite possible
to see inside a living person without invasive measures. When it comes
to a tumor, knowing exactly where it is at all times could be
lifesaving. A team of scientists at MIT are developing a way to make
that happen.

Professor
Dina Katabi and her MIT team have developed a GPS tracking system to be
used inside the body. (Image courtesy of MIT/Simon Simard.)
The team first needed to develop a wireless system that worked
without the use of batteries or other power sources. Their tracker
reflects transmitted signals from outside the body rather than producing
its own signals. This posed additional challenges due to numerous
reflections bouncing off a body. They were able to design a diode that
separates unwanted signals and lets them measure the ones they want.
During testing, the group implanted a small marker in animal
tissues and used their wireless system to track the implant’s movement.
They then developed an algorithm that uses the signal to give the
marker’s exact location, within a centimeter of accuracy.
Their successful testing has the potential to open many doors
in helping patients, particularly people with tumors. These implants
could work as tiny tracking devices that monitor the movement of
shifting tumors. In particular, the team sees it could be advantageous
for proton therapy, an approach that directs magnet-controlled proto
beams onto tumors.
This treatment requires precision, which is exactly what the
team hopes ReMix will eventually provide. If a tumor is moving during
treatment, it could expose healthy areas to radiation. If the team is
able to get ReMix even more accurate, within millimeters, it could allow
doctors to know exactly where the tumor was at all times and adjust
treatment accordingly.

ReMix
has the potential to one day assist doctors in proton therapy by
pinpointing the exact location of tumors. (Image courtesy of The
National Association for Proton Therapy.)
While ReMix isn’t quite ready for clinical testing, its researchers continue their work to improve it.
“We want a model that’s technically feasible, while still
complex enough to accurately represent the human body,” said MIT PhD
student Deepak Vasisht, lead author of the new paper. “If we want to use
this technology on actual cancer patients one day, it will have to come
from better modeling a person’s physical structure.”
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Interested in more medical innovations? Check out Medical Implants Could Be Powered by Radio Waves and E-Dermis Works to Give Feeling Back to Amputees
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