http://www.amenclinic.com
This clinic does a SPECT imaging of your brain - basically a 3d model of brain activity that can be compared to "normal" brain activity. Different medications help / effect different parts of the brain; so what this does is eliminate some of the guesswork in which medicine to try (if medication is recommended) by identifying which parts of the brain need help.
For years doctors were making a "best guess" on which brain medicine to perscribe. Using this tool they now have a much more scientific diagnostic process.
There's a cool image gallery on the website of how different brain disorders (ADD, Depression, Bipolar, ADHD, etc.) actually effects brain activity.
Here's a brief quote from their website:
"What is SPECT? It is an acronym for Single Photon Emission Computerized Tomography. SPECT is a sophisticated nuclear medicine study that looks directly at cerebral blood flow and indirectly at brain activity (or metabolism). In this study, a radioactive isotope (which, as we will see, is akin to a myriad of beacons of energy or light) is bound to a substance that is readily taken up by the cells in the brain.
A small amount of this compound is injected into the patient’s vein where it runs throughout the blood stream and is taken up by certain receptor sites in the brain. The patient then lies on a table for 14-16 minutes while a SPECT "gamma" camera rotates slowly around his head. The camera has special crystals that detect where the compound (signaled by the radioisotope acting like a beacon of light) has gone. A supercomputer then reconstructs 3-D images of brain activity levels. The elegant brain snapshots that result offer a sophisticated blood flow/ metabolism brain map. With these maps, physicians have been able to identify certain patterns of brain activity that correlate with psychiatric and neurological illnesses."