Although an MRI is not done to diagnose ADHD/ADD, in studies it does show that the ADHD brain has considerably less activity than does a normal brain when MRI's are compared. Stimulant drugs increase the chemical activity level, which decreases the symptoms.
There is a very reliable brain scan test called a SPECT scan for Single Photon Emission Computed Tomography. It is most commonly done at the Amen Clinic for ADD/ADHD. It shows the typical pattern of ADD when there is a decrease of blood and electricity in the prefrontal cortex that shows up as two "holes" in the scan.
The PET scan gives images similar to a CT scan but it also gives additional images your doctor might need to help your diagnoses. There are considerations your doctor makes for doing each test. Examples: cost of each, is each readily available where you are, will either give a better answer for your case, etc.
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