FMR?

Mike Worden mworden at neurocog.lrdc.pitt.edu
Fri Dec 5 23:48:43 EST 1997


ablab at usa.net wrote:
: I've seen there are some physicists out there also. Can someone explain
: how Functional Magnetic Resonance (hope it's correct) works? It should
: be one of the methods used in the brain function scanning. 

...and it is.

In a nutshell:
Local increases in neural activity lead to
local increases in local blood flow (outpacing demand for O2), leads to
local decreases in the concentration of deoxyHg, leads to
more homogenous local magnetic field, leads to
less T2* transverse spin dephasing, leads to
increased MR signal return in T2*-weighted images

Voila!

    __Mike Worden mworden at neurocog.lrdc.pitt.edu
  o/  630 LRDC  University of Pittsburgh 
 <\__,Pittsburgh, PA 15260  412 624-5279
  ">  http://neurocog.lrdc.pitt.edu/~mworden
   `  -climb



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