Thanks Megaspaz!) Like the left turn this is another hand signal that you should know if you have your license. Unlike the left hand turn this one is a little more tricky to figure out if you aren't familiar with it so don't expect your average car driver to know what this means.
A Single Photon Emission Computed Tomography (SPECT) scan is a type of nuclear imaging test that shows how blood flows to tissues and organs. A SPECT scan integrates two technologies to view your body: computed tomography (CT) and a radioactive material (tracer). The tracer is what allows doctors to see how blood flows to tissues and organs.
The main purpose of SPECT when used in brain imaging is to measure the regional cerebral blood flow (rCBF). The development of computed tomography in the 1970s allowed mapping of the distribution of the radioisotopes in the brain, and led to the technique now called SPECT.irst, MRI has a sensitivity of around 10 â3 mol/L to 10 â5 mol/L which, compared to other types of imaging, can be very limiting. This problem stems from the fact that the difference between atoms in the high energy state and the low energy state is very small.