What is the main content of CT enhancement

CT scan is done by injecting a contrast agent (an X-ray-opaque iodine preparation) into a vein to improve the hierarchical contrast between tissues, thereby enhancing the resolution of the CT scan. Blood from normal and diseased tissues is different. Some diseased tissues are very rich in blood, such as malignant tumors, aneurysms, etc.; Some have very poor blood, such as infarcted brain tissue, cysts of cerebral cysts, etc.

CT enhancement scans use these features to improve image resolution.

Why do CT enhanced scans?

CT enhanced scanning expands the capabilities of ordinary CT and improves the accuracy of diagnosis. In abdominal examination, many patients are hidden because of the small lesions, which makes it difficult to detect noncontrast CT scans. In particular, in liver CT examination, many lesions have similar density to normal tissues, and lesions are difficult to detect under CT scanning.

However, if CT enhancement scans are performed in time, small lesions can be diagnosed, and the symptoms can be treated in a timely manner, so as to gain valuable time.

Contrast-enhanced scanning refers to the intravenous administration of water-soluble iodine contrast agent followed by scanning, which increases the density difference between the diseased tissue and the adjacent normal tissue, thereby improving the lesion visualization rate. Enhance the contrast of the lesion with the surrounding normal tissue to facilitate the identification of the lesion or to show the extent and nature of the lesion more clearly. The purpose of thoracic augmentation is to increase the number of lesions with similar density to normal tissue, distinguish between lesions and vascular sections, observe the blood supply of lesions, and observe whether there are lesions in the blood vessels themselves. The purpose of hepatic augmentation is to increase the density difference between lesions and normal liver parenchyma, to show lesions that cannot be seen or suspicious on noncontrast scanning, to distinguish the nature of lesions based on enhancement, to show intrahepatic and extrahepatic vascular structures, and to distinguish cystic lesions from parenchymal lesions.

1. Different properties: e5a48de588b662616964757a686964616f31333433623138

In contrast-enhanced scanning, a drug is injected into a vein (usually the antecubital vein) into the blood vessel and a CT scan is performed at the same time. Noncontrast CT scans are intravenous scans that do not give iodine-containing contrast agents and are usually used for initial CT scans.

2. Different characteristics: The most important thing for CT non-contrast scanning is to master the layer thickness and layer spacing technology of each different part or organ and area of interest, and when the layer thickness is equal to the layer spacing, it is continuous scanning. Enhanced scanning is performed with 60% gastrografin intravenously to maintain a certain level of iodine in the blood.

3. Different use: Ordinary CT is an ordinary scan that does not use contrast enhancement or contrast. Contrast-enhanced CT is a scan of water-soluble iodine contrast agent administered intravenously, and the increase in iodine concentration in the blood increases the density difference between the diseased tissue and the adjacent normal tissue, thereby improving the lesion display rate.

Enhanced CT can improve the rate of lesion display Experts say that ordinary CT refers to ordinary scans that do not require contrast enhancement or contrast. Contrast-enhanced CT refers to intravenous administration of water-soluble iodine contrast agent (eg, 60% 76%) gastrografin and then scanning, and after the increase of iodine concentration in the blood, the density difference between the diseased tissue and the adjacent normal tissue increases, thereby improving the lesion display rate. Make the lesion more clearly visualized to show the lesions that are not shown or are not clearly displayed on the noncontrast scan, and make a qualitative diagnosis of the lesion by whether the lesion is enhanced or the type of enhancement.

In general, in areas with abundant blood supply, contrast media tends to accumulate. In addition, we must pay attention to the time when looking at contrast-enhanced CT, and there are some situations where dynamic observation is more clinically significant.

Ordinary CT does not require the injection of contrast agent, which avoids the possibility of contrast agent allergy. In addition, the radiation generated by scanning is harmful to the human body, ordinary CT only needs to scan the organ to be examined once, while enhanced CT needs to scan the area of interest continuously and repeatedly at different times, which means that ordinary CT is less harmful to the human body than enhanced CT.

Advantages of contrast-enhanced CT Compared with ordinary CT, contrast-enhanced CT has many advantages: high qualitative ability of lesions, high detection rate of small lesions, and extremely clear visualization of vascular structures. If malignancy has been identified, CT with contrast can improve the accuracy of tumor staging or determine the likelihood of surgical resection of the tumor.

Contrast-enhanced CT is especially suitable for the brain, chest and abdomen, and has diagnostic advantages for hepatobiliary lesions such as liver cancer, total bile duct lesions, hepatic hemangioma and biliary tract.

Allergy to iodine contrast media, severe liver and kidney damage, and severe thyroid disease are generally not treated with contrast-enhanced CT; Patients with acute traumatic brain injury, stroke, drug allergy, asthma, kidney failure, cardiopulmonary insufficiency, children under 1 year old and the elderly over 60 years old, due to the weak body function, increase the probability of contrast agent allergy, so it is necessary to carefully carry out enhanced CT examination.

What is the difference between normal CT and contrast-enhanced CT, and which one is better? Today is a long time to see.

Ordinary CT is used for screening, and it may work differently for different organs. Like chest CT, a general noncontrast scan can basically detect early lung cancer.

1. Different properties: CT non-contrast scan, also known as ordinary scan, is a scan that is intravenously not given an iodine-containing contrast agent. Enhanced scanning, one of the CT scanning techniques, applies intravascular contrast scanning.

2. Different characteristics: CT non-contrast scanning is usually used for first-time CT examination, the most important thing is to master the layer thickness and layer spacing technology of different parts or organs and areas of interest, when the layer thickness is equal to the layer spacing, it is continuous scanning, and there is no gap between adjacent layers. On the morning of the contrast-enhanced scan, I had an empty stomach, and the skin test should be negative, and there should be no obvious hypertension.

3. The scanning period is also different: the plain scan is finished after one scan, while the enhanced CT often requires multi-stage scanning, and after the contrast medium is inserted, it is scanned multiple times in different time periods.

What is the difference between normal CT and contrast-enhanced CT, and which one is better? Today is a long time to see.

1. The difference between contrast-enhanced CT and ordinary CT lies in whether to inject contrast agents.

2. Contrast-enhanced CT needs to be injected, and for patients who do contrast-enhanced CT, it is necessary to ask the patient's medical history in detail before the examination, and ask whether the patient has severe hyperthyroidism or whether he is allergic to iodine-based contrast medium. If both conditions are present, the patient cannot have a contrast-enhanced CT. In patients with poor renal function, contrast-enhanced CT should be carefully considered, as the injection of contrast can increase toxicity to the kidneys.

3. Enhanced CT also requires the patient to fast before a meal, while ordinary CT does not need to inject contrast agent, does not require the patient to fast, only needs the patient to cooperate with the password in the machine for examination, and generally has no special requirements.

Another advantage of using a mask is that enhanced CT can help doctors better plan their plans. Before performing surgery or other procedures, doctors need to understand the condition of the patient's internal organs and tissues in order to better plan the surgery or program. Enhanced CT can provide clearer and more detailed images, helping doctors better understand the patient's condition and thus better plan the best program.

Another advantage is that enhanced CT can help doctors better plan their best plans. Before performing surgery or other procedures, doctors need to understand the condition of the patient's internal organs and tissues in order to better plan the surgery or program. Enhanced CT can provide clearer and more detailed images, helping doctors better understand the patient's condition and thus better plan the program.

Contrast-enhanced CT is a medical imaging technique that is a variant of computed tomography (CT) that uses a special contrast agent to enhance images of internal organs and tissues. This technique is widely used in clinical medicine because it can provide clearer and more detailed images, helping doctors diagnose and ** diseases more accurately.

In addition, contrast-enhanced CT can also help doctors better monitor the progression of the disease. During the process, the doctor needs to constantly monitor the progress of the disease so that the plan can be adjusted in a timely manner. Enhanced CT can provide more detailed and accurate images, helping doctors better understand the progression of the disease and better adjust the plan.

In addition, contrast-enhanced CT can also help doctors better monitor the progression of the disease. During the process, the doctor needs to constantly monitor the progress of the disease so that the plan can be adjusted in a timely manner. Enhanced CT can provide more detailed and accurate images, helping doctors better understand the progression of the disease so they can better adjust** the protocol.

Contrast-enhanced CT is a method in which a water-soluble organic iodine agent (eg, 60% 76% gastrografinamide) is injected intravenously and then scanned. When the iodine concentration in the blood increases, the iodine concentration in the organs and the lesion can be different, forming a density difference, which may make the lesion more clearly visualized, so as to show the lesion that is not shown or is not clearly displayed on the noncontrast scan, and the qualitative diagnosis of the lesion can be made by whether the lesion is enhanced or the type of enhancement.

The injection method is divided into group injection method, intravenous drip method and intravenous injection and intravenous drip method.

In general, in areas with abundant blood supply, contrast media tends to accumulate. In addition, it is necessary to pay attention to the time when looking at contrast-enhanced CT, and dynamic observation is more clinically meaningful in some cases.