Because the treatment wasn't working, Jack tried something new.
He decided to use brain scans to look inside Bob's brain.
Brain scans are a way to look inside the brain to see how it is functioning.
What the scans showed about Bob was crucial.
They showed that his brain was damaged in a way that nobody had anticipated.
There was significant damage to the front part of his brain.
An injury in this part of the brain can contribute to depression and negative feeling.
It can also contribute to feelings of anger and rage.
The fact that his brain was injured and unbalanced explained why the treatments hadn't worked.
The brain scans showed why the medications and other treatments hadn't worked.
They had failed because they didn't address the brain injury.
After discussing the injury with Bob and his parents, they concluded that the cause of the injury was from playing soccer.
In fact, Jack knew of a quite few of soccer players who had sufferd head injuries from playing that sport.
Heading a hard soccer ball many times can damage the brain.
（If he hadn't played soccer，his brain wouldn't have been injured.）
With this new information, Jack used a new medication to treat the injury.
Gradually, Bob improved, and after a few months was close to full recovery.
He no longer had any signs of depression, and was finally able to return to school.
Ultimately, Bob graduated from his university with honors, and entered a famous law school.
From this experience, Jack realized that the brain imaging had allowed him to save Bob's life.
If it hadn't been for the scans, Bob would have ended up killing himself.
Detecting and treating the injury to the front part of his brain was the key step in his treatment.
Jack now believes that brain scans can be an important tool for psychiatrists.
An injured brain must be healed before other treatments, such as vitamins, drugs or counseling, can work.
（He decided to use brain scans because other treatments weren't working.）
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