Brain Doppler Ultrasound (TCD)

A method of examining the brain by brain Doppler ultrasound. Transcranial color Doppler imaging, through the sputum window, pillow window, sputum window exploration, can explore the cerebral artery, according to the intracranial blood vessel flow rate, bandwidth, abnormal flow or audio abnormalities, etc., applied to cerebrovascular diseases Diagnosis and cause classification. Basic Information Specialist classification: neurological examination classification: ultrasound Applicable gender: whether men and women apply fasting: not fasting Tips: Before the examination, all nerve excitement and sleeping sedatives should be stopped for three days, at least the day before the check. Patients diagnosed with epilepsy do not need to stop taking drugs. Disabling hair styling and other styling products, shampoo products. Normal value Standard for normal TCD: 1. The blood flow velocity is within the normal range. 2. Other parameters (PI, RI, S/D) are in the normal range. 3. The blood flow velocity values ​​in the brain are arranged in the normal order. The normal order (high-low) is MCA, ACA, ICA, BA, PCA, VA, PICA. 4. The left and right side flow speeds and the values ​​of the parameters are basically symmetrical. Generally, the peak of systolic phase difference is not more than 20cm/s, the peak of end-diastolic period is not more than 13cm/s, and the average flow velocity is not more than 15cm/s. 5. The blood flow direction is normal. 6. The spectrum shape is normal. 7, the nature of blood flow is normal: the occurrence of turbulence or eddy current signs is abnormal blood flow properties. 8. The audio signal is normal: the normal audio signal is soft and airy, and if there are various noises, it is abnormal. Clinical significance Abnormal results: 1. cerebral artery stenosis and occlusive disease. 2. Neurosurgical cerebrovascular disease. 3. Increased intracerebral pressure and determination of brain death. 4. Subarachnoid hemorrhage and cerebral vasospasm. 5. Monitoring of cerebral blood flow during surgery. 6. Migraine, sickle cell anemia, etc. Need to check the crowd Long-term headache symptoms. Precautions Preparation before inspection: 1. Before the examination, all nerve excitement and sleeping sedatives should be stopped for three days, at least the day before the check. Patients diagnosed with epilepsy do not need to stop taking drugs. 2, check the same day as usual, no need for fasting. 3. Please wash your hair the day before the test. Requirements for inspection: Disabling hair styling and other styling products, shampoo products. Inspection process Due to the thick skull, which hinders the penetration of ultrasound, past Doppler ultrasound can only detect hemodynamic changes in the extracranial arteries. The brain Doppler ultrasound system (TCD) can penetrate the thinner part of the skull and the natural tunnel to obtain the Doppler echo signal of the main artery of the skull base. The main blood vessels it can detect are: ICA: intracranial segment of the internal carotid artery CS: internal carotid artery siphon MCA: middle cerebral artery ACA: anterior cerebral artery PCA: posterior cerebral artery ACOA: anterior communicating artery PCOA: posterior communicating artery OA: ophthalmic artery VA: vertebral artery BA: basilar artery PICA: posterior inferior cerebellar artery TCD technology abandons the inaccuracy of traditional cerebral blood flow map and the traumaticity of cerebral angiography, and provides cerebrovascular hemodynamics teaching for modern imaging techniques such as CT and MRI, which is an important evidence for imaging diagnosis. It can provide reference information for the diagnosis, monitoring and treatment of cerebrovascular diseases, and analyze the factors that can cause changes in brain hemodynamics. Not suitable for the crowd Inappropriate people: Generally there are no people who are not suitable. Adverse reactions and risks This test generally has no adverse reactions.