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positron emission tomography (PET) technique combining nuclear medicine & CT technology to produce images of brain anatomy & corresponding physiology - used to study stroke, Alzheimer, epilepsy, metabolic brain disorders, chemistry of nerve transmission in the brain; provides more accuracy than SPECT & is used less often due to cost & limited availability of the radioisotopes radiography x-ray imaging cerebral angiogram x-ray of blood vessels in the brain after intracarotid injection of contrast medium computed tomography (of the head) computed tomographic x-ray images of the head used to visualize abnormalities within (ex. brain tumors, malformations) myelogram x-ray of the spinal cord made after intraspinal injection of contrast medium reflex testing tests performed to observe the body's response to a stimulus deep tendon reflexes (DTR) involuntary muscle contraction after percussion at a tendon indicating function; positive findings are noted when there is no reflex response or an exaggerated response to stimulus; #'s are used to record responses 1+diminished, 2+normal, 3+more brisk than average, 4+ hyperactive Babinski sign or reflex pathological response to stimulation of the plantar surface of the foot; a positive sign is indicated when the toes dorsiflex. transcranial sonogram image made by sending ultrasound beams through the skull to assess blood flow in intracranial vessels - used in diagnosis & management of stroke & head trauma