The most important lesson from 83,000 brain scans | Daniel Amen | TEDx
Subject: Re: The most important lesson from 83,000 brain scans | Daniel Amen | TEDx
manojkamra rti3 days ago
Now fMRI could be far far less evasive than SPECT. SPECT and fMRI both can show brain "function" fMRI (functional MRI, magnetic resonance imaging) utilizes the BOLD or "blood oxygen level dependent" contrast mechanism. There is no injection needed unless other MRI scans are being done. Brain "activity" is determined by looking for signal intensity changes that are correlated to relative metabolic need for oxygen. In general fMRI is not yet used clinically as much as it is for research. SPECT (single photon emission computed tomography) utilizes a radioactively labeled chemical tracer. The tracer is injected and accumulates in body tissue. Depending on the exact tracer the amount of "counts" detected from the anatomy corresponds to the amount of metabolism and access (perfusion) to the given tissue. Other options depending on what doctors are looking for include PET and MEG.