Small air brain CT scan

Small gas brain CT scan is used to detect small tumors in the cerebral cerebral horn pool, mainly small acoustic neuroma. The patient sits on one side of the CT bed and wears the waist as usual. After the puncture needle enters the subarachnoid space, (the CSF is dripped in the needle core), the patient is tilted up 45 degrees, and slowly injects filtered air or oxygen into the subarachnoid space through the lumbar puncture needle 5~6ml. When the subject is paralyzed and there is slight pain in the back of the ear, the gas is prompted to reach the cerebellar cerebral horn pool. Basic Information Specialist classification: Oncology examination classification: CT Applicable gender: whether men and women apply fasting: fasting Tips: Tell your doctor if you have any drug allergies and whether you have allergic diseases such as asthma and urticaria. Removal of inspection site clothing includes underwear with metal materials and various items such as headwear, hair clips, earrings, necklaces, jade, coins, belts and keys. For those who need to be fasted for 4 hours before the examination. Normal value To quantify the tissue's absorption rate for X-rays, Hounsfield defines a new scale "CT value." The CT values ​​of different tissues vary, and each fluctuates within a certain range. The CT value of the bone is the highest, 1000HU, the CT value of soft tissue is 20~70HU, the CT value of water is 0 (±10) HU, the CT value of fat is -50~-100, and the CT value of air is -1000HU. Clinical significance CT is suitable for the detection of new organisms in various parts of the body, the location diagnosis of a small number of tumors, the extent of tumor distribution, infiltration and metastasis, and CT-guided biopsy; suitable for the detection of inflammation in most parts of the body and the determination of its size. Such as brain, sputum, sinus, mediastinum, liver (inflammation or abscess such as bacteria or protozoa) inflammation of the pancreas and bones; for the detection of major vascular lesions (vascular malformations, hemangioma, vascular occlusion, bleeding) And qualitative diagnosis; has important value for determining the quantitative and qualitative bleeding of important organ trauma, is also very valuable for the location of a variety of traumatic foreign bodies, and is very sensitive to the detection of calcification or stones in some areas. CT is also suitable for the detection of a degeneration or congenital anomaly, such as liver steatosis and congenital abnormalities of the central nervous system. Precautions Taboo before inspection: 1. Before the examination, the CT doctor should be informed of the detailed medical history and various examination results. If you have your own saved X-ray film, magnetic resonance film and previous CT film, you need to submit it to CT doctor for reference. 2, to explain to the doctor whether there is drug allergy, whether it has asthma, urticaria and other allergic diseases. 3, remove the inspection site clothing including underwear with metal materials and various items: such as headwear, hairpins, earrings, necklaces, jade, coins, belts and keys. 4, need to enhance the person before fasting for 4 hours. 5, if CT enhanced scan or children, unconscious, need to be accompanied by healthy people. 6, CT enhanced scan If you use ion contrast agent, you need to do intravenous injection of iodine allergy test, no response after 20 minutes, before you can check. 7, do not take heavy metal drugs within 1 week, do not do gastrointestinal tincture examination. Patients who have been tested for expectorant need to wait for the sputum to empty; if they are eager to have a CT examination, they should be treated with a cleansing enema or oral laxative to sputum. Requirements for inspection: 1. Obey the instructions of the technicians during the inspection, keep the position and do not move, and cooperate with the examination to calmly breathe, hold your breath, do not swallow, and do not blink your eyes. 2. The CT machine is equipped with a walkie-talkie. If there is any discomfort during the examination or an abnormal situation occurs, the doctor should be informed immediately. Inspection process The patient sits on one side of the CT bed and wears the waist as usual. After the puncture needle enters the subarachnoid space, (the CSF is dripped in the needle core), the patient is tilted up 45 degrees, and slowly injects filtered air or oxygen into the subarachnoid space through the lumbar puncture needle 5~6ml. When the subject is paralyzed and there is slight pain in the back of the ear, the gas has reached the cerebellar cerebral angle pool. After maintaining a similar position, and then performing a positioning scan, the nerves and blood vessels in the cerebellar cerebral horn pool and the internal auditory canal structure can be clearly displayed, and the bed rest can be rested for 1 day after the examination. Not suitable for the crowd Inappropriate people: patients with severe heart and kidney failure.