What is CT? What are the functions?

CT(X-ray Computerized Tomography) adopts X-ray tomography, which is received by electro-optical detector, converts the signal into digital data, and then converts it into images by computer. CT is a painless, non-destructive, non-dangerous, rapid and convenient auxiliary examination tool, which is suitable for any age and has high accuracy. 1970 CT was successfully designed in Britain, and 1973 first reported the diagnostic value of brain diseases in clinical application. Since 1976 reported the results of CT examination of 6500 epilepsy patients, this examination has been carried out at home and abroad, which greatly improved the diagnostic level of intracranial lesions (space occupying lesions, vascular lesions, brain dysplasia, brain atrophy). CT examination includes plain CT scan (that is, conventional CT without injection of contrast agent) and enhanced CT scan (that is, intravenous injection of contrast agent scanning method).

Due to the application of CT, the accurate diagnosis rate of epilepsy etiology has been greatly improved. CT examination can not only show the location and shape of the lesion and its relationship with the surrounding brain tissue, but also make qualitative analysis, and can also find the lesion with only density change and no occupying effect. CT found that the main changes of epilepsy patients were brain atrophy, brain tumor, cerebral infarction, abnormal brain development, hydrocephalus, calcification and arteriovenous malformation.

1, features of CT: CT is the abbreviation of computed tomography. 1969 is designed successfully, which is convenient, safe, painless and non-invasive. CT images are clear, with high resolution, clear anatomical relationship and clear pathological development.

2. Purpose of brain CT examination: Epilepsy can be caused by many reasons, such as brain atrophy, brain hypoplasia or retardation, brain tumor, cerebral vascular malformation, cerebral infarction, hydrocephalus, brain malformation, encephalomalacia, brain calcification, high-density changes of unknown reasons or properties, low-density changes, etc. If the brain has the above lesions, CT examination can find them. If the CT film shows normal, the above lesions can generally be ruled out.

CT (Computed Tomography) was a major breakthrough in radiation diagnosis in the early 1970s. CT is not X-ray photography, but a reconstructed image obtained by scanning human body with X-rays and processing it by computer. It can display and image organs and their lesions that are difficult to display by traditional X-ray examination, with vivid images and clear anatomical relationship, which expands the scope of human examination and greatly improves the early detection rate and diagnostic accuracy of lesions. This kind of examination is simple, safe, painless, non-invasive and non-dangerous. It promoted the development of medical imaging diagnostics, and the inventor won the Nobel Prize of 1979. At first, CT was only used for head examination, and in 1974, whole body CT appeared again. In just 10 years, CT has spread all over the world, from the first generation to the fifth generation. Most of the CT used in hospitals in major cities in China belong to the third generation. Whole-body CT can be used for transverse scanning of head, chest, abdomen and pelvis, as well as regional scanning of thyroid, spine, joints, soft tissues and five senses. CT is most suitable for finding out the size, shape, number and invasion range of tumor, cyst, swollen lymph nodes, hematoma, abscess and granuloma, and can determine the staging of some organ cancers and whether they can be surgically removed. In some cases, CT can also distinguish pathological features of lesions, such as authenticity, cystic, vascular, inflammatory, calcium, fat and so on.

There are three methods for CT examination. One is plain scan, which is common scan and routine inspection. Second, enhanced scanning, intravenous injection of water-soluble organic iodine, and then scanning can make some lesions show more clearly; The third is contrast scanning, in which organs or structures are imaged first and then scanned. For example, by injecting contrast agent or air into the cisterna cerebri for cisternography and then scanning, the cisterna cerebri and its small tumors can be clearly displayed.

Before the CT examination, the patient's preparation is also very simple, as long as he fasted before the examination. However, before abdominal examination, other contrast examinations can't be done, especially barium can't be used for gastrointestinal radiography, so as to avoid artifacts caused by the residual contrast agent in the intestine, which will affect the quality of ct images and lead to misdiagnosis. Before head scanning, X-ray skull plain film and sectional photos should be taken first. Before hepatobiliary and pancreatic examination, we should do various laboratory examinations, according to abdominal plain film, cholangiography and ultrasound examination. Renal pyelography and B-ultrasound should be done before renal examination. Before the chest examination, you should take a chest plain film and a cross-sectional photo. Before spinal examination, the anteroposterior and oblique photos of the spine should be taken first. So as to select the best scanning mode and the most reasonable scanning range.

CT (Computed Tomography) was a major breakthrough in radiation diagnosis in the early 1970s. CT is not X-ray photography, but a reconstructed image obtained by scanning human body with X-rays and processing it by computer. It can display and image organs and their lesions that are difficult to display by traditional X-ray examination, with vivid images and clear anatomical relationship, which expands the scope of human examination and greatly improves the early detection rate and diagnostic accuracy of lesions. This kind of examination is simple, safe, painless, non-invasive and non-dangerous. It promoted the development of medical imaging diagnostics, and the inventor won the Nobel Prize of 1979. At first, CT was only used for head examination, and in 1974, whole body CT appeared again. In just 10 years, CT has spread all over the world, from the first generation to the fifth generation. Most of the CT used in hospitals in major cities in China belong to the third generation. Whole-body CT can be used for transverse scanning of head, chest, abdomen and pelvis, as well as regional scanning of thyroid, spine, joints, soft tissues and five senses. CT is most suitable for finding out the size, shape, number and invasion range of tumor, cyst, swollen lymph nodes, hematoma, abscess and granuloma, and can determine the staging of some organ cancers and whether they can be surgically removed. In some cases, CT can also distinguish pathological features of lesions, such as authenticity, cystic, vascular, inflammatory, calcium, fat and so on.

There are three methods for CT examination. One is plain scan, which is common scan and routine inspection. Second, enhanced scanning, intravenous injection of water-soluble organic iodine, and then scanning can make some lesions show more clearly; The third is contrast scanning, in which organs or structures are imaged first and then scanned. For example, by injecting contrast agent or air into the cisterna cerebri for cisternography and then scanning, the cisterna cerebri and its small tumors can be clearly displayed.

Before the CT examination, the patient's preparation is also very simple, as long as he fasted before the examination. However, before abdominal examination, other contrast examinations can't be done, especially barium can't be used for gastrointestinal radiography, so as to avoid artifacts caused by the residual contrast agent in the intestine, which will affect the quality of ct images and lead to misdiagnosis. Before head scanning, X-ray skull plain film and sectional photos should be taken first. Before hepatobiliary and pancreatic examination, we should do various laboratory examinations, according to abdominal plain film, cholangiography and ultrasound examination. Renal pyelography and B-ultrasound should be done before renal examination. Before the chest examination, you should take a chest plain film and a cross-sectional photo. Before spinal examination, the anteroposterior and oblique photos of the spine should be taken first. So as to select the best scanning mode and the most reasonable scanning range.