John was injured in a car accident and lost consciousness for 10 minutes. he sustained numerous lacerations, a right femoral contusion, and had a large open wound on his head. when he arrived at the emergency room, which neuroimaging technique did the attending physician immediately order to rule out any soft-tissue damage to the brain? electroencephalogram (eeg) magnetic resonance imaging (mri) functional mri (fmri) positron emission tomography (pet)