Hi, has anyone of you done a PET and/or a SPECT scan? If so, what were the results? And how did you manage to get such a test prescribed? There is someone that has cognitive dysfunction such as slow thinking, inability to formulate articulate toughts, difficult understanding things, decrease in IQ etc (mind, I mean a decrease in intellectual abilities compared to your pre -illness self, not simply brain fog)...but at the same time had not any problems (such as hypoperfusion) visibile on a PET/SPECT scan? Also, do someone know if hypoperfusion necessarely means that there is brain damage, or can it also mean that there is simply not enough blood flow to make the brain function well but without actualli damaging it?