General knowledge and precautions for routine CT examination of various parts of the body 1. Head (including cranial, orbital, sinus, maxillary and mandibular, temporal bone, etc.): the body is supine, the head and occiput are placed flat in the head rest, the tip of the nose is upward, the face is symmetrical from left to right, and the jaw is inward. Caution: Remove metallic objects from the head, such as glasses, hairpieces, wigs, dentures, etc., and keep the head stationary during the examination. When doing orbital CT examination, do not turn your eyes during the examination. 2.Neck (vertebrae): The body is supine, the head is placed under the head rest, the head is tilted back, the shoulders are sunk as far as possible, and the head, neck and chest are kept in the same straight line. Caution: remove metallic items from the neck, such as necklaces, earrings, earrings, plasters, neck zippers, etc. Keep the body still during the examination and try not to do swallowing movements. 3.Throat: Lie on your back, place your head under the head rest, tilt your head back, sink your shoulders as much as possible, keep your head, neck and chest in the same straight line. Caution: Do not swallow during the scanning process, and continuously pronounce the “yi” sound on the doctor’s command. 4, chest, heart, esophagus The body lies on its back, the head is placed flat in the head rest, the arms are raised or hold the head, the legs are placed flat, breathe evenly, and follow the instructions to do the action of “inhalation – hold the breath – gasp”, make sure that the breath is not out of the mouth and nose when holding the breath, so as not to affect the effect of the examination. Note: Remove metal objects from the chest, such as bras, necklaces, metal zippers, cell phones, coins, plasters, etc. 5.Shoulder: The body is supine, the head is placed flat in the head rest, and the arm of the affected shoulder is placed flat on the side of the body with the palm up. Note: Remove metallic objects from the shoulder, such as necklaces, metallic zippers, plasters, etc. 6.Abdomen (liver, gallbladder, pancreas, spleen, stomach, small intestine, colon, kidney, ureter, bladder, uterus, etc.): Lie on your back with your head flat in the head rest, arms up or holding your head, legs flat, breathe evenly, and follow the instructions to do the action of “inhale – hold your breath – gasp” to ensure that the breath does not come out of your mouth or nose when you hold your breath, so as not to affect the examination. Effect. Caution: Remove metal objects from the abdomen, such as belts, plasters, cell phones, coins, etc. The liver, gallbladder, pancreas, spleen, kidney, stomach, small intestine, colon and other parts of the body. During the examination, it is necessary to take a certain dose of contrast orally for a specified period of time to fill the empty cavity organs such as stomach, small intestine and colon; for bladder and uterine examination, it is necessary to hold urine in the bladder to a moderate degree to ensure the effect of the examination. For full abdominal examinations, both oral contrast and urine holding are required. Acute trauma, acute abdomen, abdominal stones, acute pancreatitis and other conditions that require a diet ban do not require contrast agents. 7, lumbar spine: the body lying on its back, head flat in the head rest, arms up or hold the head, legs flat, breathing evenly, and follow the instructions to do “inhalation – hold the breath – gasping” action, to ensure that when holding the breath does not come out of the mouth and nose, so as not to affect the effectiveness of the examination. Caution: Remove metal objects from the waist, such as belts, plasters, cell phones, coins, etc. 8.Pelvis and both hips: The body is lying on its back, the head is placed flat in the head rest, the arms are raised or holding the head, and the legs are placed flat. Caution: remove metal objects from the lower abdomen, such as belts, plasters, cell phones, coins, etc. 9, hands: prone position, head first into bed, hands raised above the head, palms down, placed on the scanning bed. Caution: remove foreign objects such as watches and bracelets. 10, knee, ankle, foot: feet first bed, body supine in the center of the examination bed, put the feet under the head rest, toes up. When the foot is examined, the feet are placed on the board, and the soles of the feet are pressed against the bottom of the board. Caution: Take off shoes and remove metal objects such as anklets.