What is angiography and what is the purpose of an imaging test?

1.Contrast is a commonly used X-ray test. X-rays and fluoroscopy can only distinguish tissues and organs with large density differences, such as bones, hearts, lungs, etc., and there is nothing that can be done about a large number of organs and tissues with small density differences.

This led to the idea of contrast examination, in which the area to be examined is perfused with a contrast medium that is higher or lower than the density of the body's soft tissues, and then X-rays are performed. Because the density of the tissues and organs perfused with contrast agent is greatly different from the surrounding parts, and the contrast is sharp on x-rays, it is possible to detect whether there is an abnormality in morphology or function. In 1906, someone invented barium swallow to examine the gastrointestinal tract, and since then various imaging methods and contrast agents have been developed.

Contrast agents are divided into 5 main categories according to their performance. One is a contrast agent excreted through the kidneys, which is mostly used for urinary and cardiovascular imaging; the second is the contrast agent excreted through the liver and gallbladder, such as iodoponic acid, which is mainly used for contrast examination of the hepatobiliary system; the third is lipid contrast agents, such as iodized oil, iodophenyl ester, etc., which are mainly used for imaging of bronchial, uterine and other pipelines, body cavities, etc.; The fourth is a solid contrast agent, such as barium sulfate, which is modulated into a suspension to swallow or enema for digestive tract imaging. The density of the above four types of contrast agents is higher than that of human soft tissues, and they are collectively referred to as positive contrast agents, which appear white on X-ray films.

The fifth type is a gas contrast agent, such as air, carbon dioxide, oxygen, etc., which is less dense than the soft tissues of the human body, and is a negative contrast agent, which is black on the X-ray film.

2.Contrast X-ray has a certain effect on the human body and has a killing and destructive effect on cells. Excessive exposure can be life-threatening.

However, during the general diagnostic examination, such as a chest X-ray, take an X-ray, the dose is small (within the safe dose), and there will be no adverse reactions to the body, so do not worry; But don't take a random photo, if you are sick, take an X-ray, because regular X-ray will also have a certain damage to your health. Patients should follow their doctor's instructions and avoid unnecessary x-rays. People who do not have an examination should not watch the examination so as not to increase the amount of radiation unnecessarily.

3.Different parts of the imaging have different **.

Hello, Contrast is a commonly used X-ray test.

The purpose of contrast examination is to better confirm the diagnosis of the organs that need to be examined, so that the size, shape and internal structure of the organs to be examined can be more clearly reflected, so as to achieve the purpose of diagnosis. Coronary angiography can show and understand whether there is stenosis in the coronary blood vessels, the degree of stenosis, the condition of the blood vessel wall and the size of the lesion through the contrast agent.

At present, coronary angiography is considered to be the golden indicator for the diagnosis of coronary heart disease. Contrast-enhanced ultrasonography and CT contrast can be used to confirm the diagnosis of space-occupying lesions by three-stage changes in contrast media. At present, contrast examination is more and more widely used in clinical practice, and can be applied to various organs of the body, including heart, blood vessels, abdominal organs, reproductive system, eyes, brain and other examinations.

Salpingography is a test in which a contrast medium is injected through the cervix to show the lumen of the uterus and fallopian tubes. The contrast medium is 40 iodized oil or organic iodine preparation. Contrast medium is injected under fluoroscopy, and radiographs are taken when the uterus and fallopian tubes are fully revealed, and repeated at intervals (one day if the contrast medium is iodized oil) to observe the patency of the fallopian tubes.

Imaging can occasionally make the blocked fallopian tubes unobstructed to achieve the best purpose. Clinical practice has found that salpingography can not only effectively check the patency of the fallopian tubes, but also play a significant role in some fallopian tube obstruction through compression. Pregnancy rates have been reported in 60% of patients with transtubal iodine angiography.

It can be said that this is an economical and affordable means of inspection and **.

The purpose of medical imaging is to make the medical images taken clearer and easier for doctors to diagnose lesions.

Contrast examination: For structures or organs that lack natural contrast, substances with a density higher or lower than the structure or organ can be introduced into the organs or in a shared space to produce contrast for development, which is a contrast examination, and the substance introduced is called a contrast agent or contrast medium. Most contrast media contain iodine, and people with iodine allergy should be careful.

Contrast examination is to introduce a substance that is higher or lower than the density of the human body into the part of the human body to be examined, and artificially cause the difference in the density of the part to be examined, so as to constitute a contrast and achieve the purpose of diagnosis. Before the imaging procedure, the patient should make the necessary preparations.

The hazards of imaging may vary depending on the item to be examined. If you do coronary angiography of the heart, because it is an invasive examination, there will be some complications in the process of puncture, and in the process of using contrast media, there will also be tearing, peeling, coronary artery spasm, and even a certain degree of angina, and severe patients will lead to sudden cardiac death, especially in elderly patients. During the examination, the patient is also exposed to a certain amount of radiation because it is performed under an X-ray machine, but this radiation is usually mild.

In the case of salpingography, there may be local pain after the angiogram, which can usually be relieved on its own, and there may be a small amount of bleeding within a week, and it is not a big problem. Gastrointestinal angiography is generally not too dangerous.