right so this is the concentration of hemoglobin we detect the brain again in response to electric stimulation of the pause of the animal on one side you can see the counter lateral side of the brain activate so on this side we're showing why this is analogous to PET imaging so we're using a glucose analog that mimics glucose so when there's glucose uptake you can see stronger signals right this is very much like PET imaging so this can be potentially very powerful in the future as well because photo acoustics can serve as a backbone to