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Unformatted text preview: ering checkerboard vs when they are not. Not surprising, but
validated the technique. It offers more advantage over PET Time Functional Magnetic Resonance Imaging (fMRI)! Advantages of fMRI over PET!
Higher spatial & temporal resolution!
Noninvasive, and procedure can be repeated!
Anatomical & functional scans can be collected together!
More ﬂexible experimental designs!
So fMRI offered more spatial resolution (3 mm) and temporal resolution (b/c in PET must let half life expire, and
many limitations on what you can have people doing). Since collecting a signal every 2 secs in the brain, allows
more ﬂexibility in experimental design. PET relies on tracer in the bloodstream, but fMRI uses a natural tracer, so not
as invasive and can do it again and again. Also, fMRI allows a screen of the anatomy when you are already there
Once developed, fMRI became the preferred neuro-imaging technique for cognitive neuroscientists. PET has a
couple of advantages, one, that you can trace particular transmitters. But would prefer MRI if looking for a tumor
(because better res. ) Physics of fMRI! “MRI is based on the detection of
electromagnetic signals (radio frequency (RF)
waves) which emanate from spinning hydrogen
protons when they are excited by an RF pulse
applied in the prese...
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- Fall '11