The doctor was explaining the bruises found on Channon's body, specifically the bruises to her arms where someone grabbed her hard enough to leave bruising on the arms and the bruises on her shins and front lower legs. Ms. Manning passed out at this point. They weren't speaking about anything related to any photos that were shown on the screen. They were talking about the bruises.
It was stated today that Ms. Manning said that the whole testimony had gotten to her, not one specific photo.