The Neural Imaging System is found in one of the military vehicles while on Isham Seely's quest, or if you head to the northwest area of the map. However, be warned, because there are some powerful Red Strain Infected surrounding the area. The ones in the bright yellow HAZMAT suits are wearing bullet-resistant vests. You should bring a long a few crew members to obtain it, because of the difficulty in dealing with the Red Strain Infected people.