Ask HN: What is the state of brain imaging to help depression?

Context: I'm someone who's struggled with depression myself, and have seen many others go through the same. I'm better now, and I want to help. Lot of the research I found talk about brain imaging to find the parts of the brain currently activated (under some stressors), and propose solutions.

I'm curious about: 1. the current state of brain imaging technology to accurately identify solutions to help a depressed person 2. what are the blockers to allowing individuals to analyze their own brain state with at-home technologies?

Thank you.