About contrast enhanced CT, what does contrast enhanced CT mean

If you give the patient augmentation, it will show on the image, not whether you can feel it or not. Emphasizing medical ethics all day long, shouldn't we also emphasize the ethics of patients? Trust is a virtue for patients!

It's definitely injected, don't believe it, take it to other hospitals for identification, you will know it at a glance!

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

Can contrast-enhanced CT detect occult fractures?

Of course, iodine contrast media, such as iobitool, must be injected.

If you don't know this, go to the hospital and ask the CT doctor to find out.

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.

Because the doctor cannot confirm the diagnosis after the CT examination, the doctor will recommend the patient to undergo a CT enhancement examination. These patients need to be tested with intravenous drugs before being examined, so that the results of the examination will be more accurate and it will be easier for the doctor to determine the condition.

For some larger diseases, CT enhancement examination is also required, such as some people with cancer, they need to have CT enhancement examination regularly to observe whether the number of cancer cells has spread, so as to know the effect of **. Or for some people who are afraid that they have cancer, they can also have a CT scan, through which they can know whether they have cancer or not, and avoid adding a burden to themselves.

01 Click: 1163 In the daily work of the CT room, there are two kinds of ordinary CT scans and CT enhanced scans, ordinary CT scans refer to ordinary scans without contrast enhancement or contrast, that is, CT non-contrast scans. Many patients wonder why a CT scan is needed and what is the purpose and significance of the test?

In fact, CT scan is a common method of CT examination, which is a method of CT scan examination after intravenous injection of a certain dose of iodine-containing contrast agent. CT enhanced scanning is required and essential. The purpose of contrast enhancement is to enhance the contrast between the lesion and the blood vessel and the surrounding tissue, so as to facilitate the detection of the lesion or to show the extent and nature of the lesion more clearly, and provide valuable information for the qualitative diagnosis of the lesion.

Although CT non-contrast scan (without injection of contrast agent) can find some lesions and even diagnose some diseases, CT non-contrast scan cannot or is not easy to find some lesions (such as vascular malformations, early cancer and metastases, etc.), and CT non-contrast scan can not reflect the blood ** of lesions, and the extent and stage of lesions cannot be accurately judged for some malignant lesions. Therefore, in order to improve the display rate of lesions, find isodense lesions that are not found during non-contrast scanning, better clarify the nature of lesions, determine the extent and clinical stage of lesions, and provide a basis for clinical rationality, CT contrast scanning is an indispensable means. CT enhancement can improve the qualitative ability of lesions according to the presence and extent of lesion enhancement and the mode or type of enhancement, and it is not difficult to make a qualitative diagnosis of typical cases.

If malignancy has been identified, the purpose of the enhanced scan is to improve the accuracy of the tumor staging or to determine the likelihood of surgical resection of the tumor. For the diagnosis and display of vascular lesions, dynamic contrast scanning is indispensable, and contrast scanning is also important for the identification of vascular and non-vascular lesions, such as the identification of blood vessels and small lymph nodes is a clear example. The identification of lymph nodes and blood vessels in the hilum, neck, pelvis and other parts is often difficult on flat images, and the density difference between the blood vessels developed by concentration and the lymph nodes that are not enhanced is expanded through contrast-enhanced scanning, and it is easy to distinguish.

In short, CT enhanced scanning is a very important means of examination, which needs to be carried out in strict accordance with medical rules and regulations, with the active cooperation of patients and their families and the premise of ensuring safety.

Contrast agent is added to the ordinary CT scan, which can be clearer.

The difference between contrast-enhanced CT and regular CT is whether or not a contrast agent is used, and the results of the scan are not the same:

1. Whether to use contrast agents.

Ordinary CT, that is, CT non-contrast scan, does not use contrast agent, but directly does CT scan;

Contrast-enhanced CT is a short injection of iodine-containing contrast agent from a vein on the basis of ordinary CT, and the scan is completed within a set time.

2. The scanning effect is different.

Ordinary CT mainly scans human tissues and organs to find lesions, but imaging cannot distinguish the nature of lesions, the relationship between lesions and tissue structures;

Contrast-enhanced CT imaging can observe the blood supply of tissues, organs and lesions, or vascular lesions, improve the density difference between lesions and normal tissues, and help to find lesions, show the extent of lesions and make qualitative diagnoses.

If the tumor is examined, CT with contrast is required in all locations except for thin-slice chest CT scan of the lung nodules.

The main differences between enhanced CT and ordinary CT are as follows: 1. The principle is different, the former is a method of intravenous injection of contrast agent on the basis of ordinary CT for imaging. The latter does not require the use of contrast agents.

2. The information content displayed by the two examinations is different, enhanced CT uses different blood supply to diseased tissues and normal tissues, and the degree of intensification after injection of contrast agent is different, in addition to showing the content of ordinary CT, it can also more clearly outline the outline of the lesion and the characteristics of the internal blood supply, and judge the nature of the lesion more accurately than ordinary CT. 3. The radiation is different, and the same type of instrument is examined, and the cumulative radiation amount of enhanced CT is higher than that of ordinary CT examination. Because contrast-enhanced CT requires a three-phase scan, while ordinary CT can be scanned once.