How to do CT

CT (X-ray computed tomography) uses X-ray tomography. The electrophoton detector receives the signal and converts the signal into digital input into an electronic computer, which is then converted into an image by the computer. CT is a It is a painless, non-injurious, non-dangerous, fast and convenient auxiliary examination tool suitable for any age and with high accuracy. CT was successfully designed in the UK in 1970, and its diagnostic value for brain diseases in clinical application was first reported in 1973. Since the comprehensive report of CT examination results of 6,500 epilepsy patients in 1976, this examination has been carried out at home and abroad, which has greatly It improves the diagnostic level of intracranial lesions (space-occupying lesions, vascular lesions, brain developmental malformations, brain atrophy and other structural brain damage), and is more reliable for stereoscopic localization of epileptic lesions, determination of pathological characteristics and etiology analysis of lesions. CT examinations include plain CT scan (i.e. conventional CT scan without injection of contrast agent) and enhanced CT scan (i.e. scan method by injecting contrast agent intravenously).

Due to the application of CT, the diagnosis rate of the cause of epilepsy has been greatly improved. CT examination can not only show the location, shape and relationship between the lesion and the surrounding brain tissue, and use it to make qualitative analysis, but also Lesions with only density changes without mass effect can be found. The main changes found on CT in patients with epilepsy include brain atrophy, brain neoplasms, cerebral infarction, abnormal brain development, hydrocephalus, calcification, and arteriovenous malformations.

1. Characteristics of CT: CT is the abbreviation of computed tomography. It was successfully designed in 1969 and has the characteristics of convenient, safe, painless and non-invasive examination. CT images have clear images, high resolution, clear anatomical relationships, and clear visualization of pathological conditions.

2. The purpose of brain CT examination: Epilepsy can be caused by many reasons, such as brain atrophy, brain hypoplasia or retardation, brain tumor, cerebrovascular malformation, cerebral infarction, hydrocephalus, cerebral infarction, etc. Malformations, encephalomalacia, brain calcifications, high-density changes, low-density changes of unknown cause or nature, etc. If there are any of the above-mentioned lesions in the brain, they can be discovered by CT examination. If the CT film shows normal, the existence of the above-mentioned lesions can generally be ruled out.

CT (computed tomography) was a major breakthrough in radiological diagnosis in the early 1970s. CT is not an X-ray photography, but uses X-rays to scan the human body to obtain information, which is processed by an electronic computer. The reconstructed image obtained. It can image organs and their lesions that are difficult to display in traditional X-ray examinations, and the images are realistic and the anatomical relationships are clear, thereby expanding the scope of human body inspection and greatly improving the early detection rate and diagnostic accuracy of lesions. This kind of examination is simple, safe, painless, non-invasive and non-dangerous. It promotes the development of medical imaging diagnostics, and the inventor won the Nobel Prize in 1979. Initially, CT was only used for head examination, and in 1974, whole-body CT appeared. In just over 10 years, CT has spread all over the world, developing from the first generation to the fifth generation. Most of the CTs used in hospitals in major cities in my country belong to the third generation. Whole-body CT can be used for cross-sectional scans of the head, chest, abdomen, and pelvis, as well as regional scans of small parts such as the thyroid, spine, joints, soft tissues, and facial features. CT is most suitable for identifying the size, shape, number and extent of invasion of space-occupying lesions such as tumors, cysts, enlarged lymph nodes, hematomas, abscesses and granulomas. It can determine the staging of cancer in certain organs and whether it can be performed Surgical removal. In some cases, CT can also distinguish the pathological characteristics of lesions such as solid, cystic, vascular, inflammatory, calcium, fatty, etc.

There are three methods for CT examination. One is plain scan, which is an ordinary scan and is a routine examination; the other is enhanced scan, which involves injecting water-soluble organic iodine from the vein and then scanning, which can make certain lesions appear more clearly. Clearly; the third is the contrast scan, which first performs contrast imaging of organs or structures, and then scans, such as injecting contrast agent or air into the brain cistern to perform cistern imaging, and then scanning, which can clearly display the brain cistern and small tumors in it.

Before the CT examination, the patient's preparation is also very simple, as long as he fastes before the examination. However, other contrast examinations cannot be performed before the abdominal examination, especially barium gastrointestinal imaging, to prevent the residual contrast agent in the intestine from forming artifacts, affecting the quality of the CT image, and leading to misdiagnosis. Before the head scan, X-ray skull films and tomograms should be taken. Before the examination of the liver, gallbladder, and pancreas, various laboratory tests, including abdominal plain films, cholangiography, and ultrasound should be performed. Before kidney examination, pyelography and B-ultrasound examination should be done. Before chest examination, chest plain films and tomograms should be taken. Before spine examination, it is necessary to take frontal and lateral photos of the spine, etc. In order to choose the best scanning method and the most reasonable scanning range

CT (computed tomography) was a major breakthrough in radiological diagnosis in the early 1970s. CT is not X-ray photography, but uses X-rays Scan the human body to obtain information and reconstruct the image obtained through computer processing. It can image organs and their lesions that are difficult to display in traditional X-ray examinations, and the images are realistic and the anatomical relationships are clear, thereby expanding the scope of human body inspection and greatly improving the early detection rate and diagnostic accuracy of lesions. This kind of examination is simple, safe, painless, non-invasive and non-dangerous. It promotes the development of medical imaging diagnostics, and the inventor won the Nobel Prize in 1979. Initially, CT was only used for head examination, and in 1974, whole-body CT appeared. In just over 10 years, CT has spread all over the world, developing from the first generation to the fifth generation. Most of the CTs used in hospitals in major cities in my country belong to the third generation.

Whole body CT can be used for cross-sectional scans of the head, chest, abdomen, and pelvis, as well as regional scans of small parts such as the thyroid, spine, joints, soft tissues, and facial features. CT is most suitable for identifying the size, shape, number and extent of invasion of space-occupying lesions such as tumors, cysts, enlarged lymph nodes, hematomas, abscesses and granulomas. It can determine the staging of cancer in certain organs and whether it can be performed. Surgical removal. In some cases, CT can also distinguish the pathological characteristics of lesions such as solid, cystic, vascular, inflammatory, calcium, fatty, etc.

There are three methods for CT examination. One is plain scan, which is an ordinary scan and is a routine examination; the other is enhanced scan, which involves injecting water-soluble organic iodine from the vein and then scanning, which can make certain lesions appear more clearly. Clearly; the third is the contrast scan, which first performs contrast imaging of organs or structures, and then scans, such as injecting contrast agent or air into the brain cistern to perform cistern imaging, and then scanning, which can clearly display the brain cistern and small tumors in it.

Before the CT examination, the patient's preparation is also very simple, as long as he fastes before the examination. However, other contrast examinations cannot be performed before the abdominal examination, especially barium gastrointestinal imaging, to prevent the residual contrast agent in the intestine from forming artifacts, affecting the quality of the CT image, and leading to misdiagnosis. Before the head scan, X-ray skull films and tomograms should be taken. Before the examination of the liver, gallbladder, and pancreas, various laboratory tests, including abdominal plain films, cholangiography, and ultrasound should be performed. Before kidney examination, pyelography and B-ultrasound examination should be done. Before chest examination, chest plain films and tomograms should be taken. Before spine examination, it is necessary to take frontal, lateral and oblique photos of the spine. In order to choose the best scanning method and the most reasonable scanning range.