PET Scan

Positron Emission Tomography is the most invasive technique discussed here. it requires an injection of a mildly radioactive material into the blood stream. This follows the same theory that the fMRI relies on, that the more activation in a part of the brain, the more blood is needed support it. As activation occurs, the radioactive tracer moves into the brain and collects in the areas with the most activation. The tracer then begins to decay, emitting Positrons. These Positrons can then be measured to determine where the activation occurred.

This type of scan produces results similar to those of an fMRI but with a slightly better localization resolution and with out the distraction of a large “wurring” machine.

Image source: http://www.cbc.ca/news/health/story/2009/07/14/alzheimer-early-diagnosis.html

Comments are closed.