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.
Psychiatrists are the only medical specialists who rarely look at the organ they treat. Psychiatrists continue to make diagnoses the same way they did 100 years ago, based on clinical exams and symptom clusters. There is a better way. SPECT imaging is a clinically useful way to look at brain function.