I agree that there's promise in using imaging techniques to analyze and treat psychological and psychiatric disorders. Like Amen, I am often surprised and disappointed by the amount of sheer "black box" guesswork that goes into psychiatric diagnoses and treatment -- especially when compared to conventional medical disciplines.

This said, there's some (fair) criticism that we shouldn't put too much faith in medical imaging techniques just yet:

Brain Scans as Mind Readers? Don't Believe the Hype

Anyway, I wouldn't mind if SPECT imaging were more widely available, or at least covered by most insurance plans (because right now, it's way too expensive for me to even consider pursuing :P). Currently, I think neuromedical imaging is covered by insurance only when it's necessary to distinguish between Alzheimer's and rare cases of dementia.