It is not "spec" imaging but SPECT (single proton emission computed tomography) imaging. It uses gamma rays and provides a true 3D image.
Many different people because there are many kinds of imaging.
MRI uses strong magnetic field and electromagnetic waves to create an image, while the x-ray imaging (regular x-ray like chest x-ray, or CT scan xray) reconstruct the image by finding how much x-ray...
Not much. Some put the span of the IR spectra at a lightly different place than the thermal span, but the difference is marginal.
heart rate, blood pressure, temp. they check oxygen to blood ratio also. More depends on what is happening with the person.
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