Should I get a brain scan/X-ray done , before trying any meds like Risperidone , Ablify or Olanzapine ?

Should I get a brain scan/X-ray done , before trying any meds like Risperidone , Ablify or Olanzapine ? Guys do you think getting a Brain scan or X-ray is important before using meds like Olanzapine, risperidone or even Ablify ? Just to know your individual causes. Also , has the 0.5mg Risperidone helped ?