What is enhanced CT for?

Enhanced ct scan is to inject drugs into blood vessels from veins (usually anterior elbow veins), and at the same time, CT scan can find lesions that are not found by plain scan (drugs are not injected into blood vessels), which is mainly used to distinguish whether the lesions are vascular or non-vascular, to clarify the relationship between mediastinal lesions and cardiac vessels, to understand the blood supply of lesions, and to help distinguish benign and malignant lesions. Increase the information of lesions, so as to facilitate qualitative analysis and even diagnosis of lesions.

When using ordinary CT scanning, tumor tissue and surrounding normal tissue can show the same or similar density, so CT doctors often report it as normal because they can't find the lesion.

However, if enhanced scanning is performed at this time, abnormal enhancement can be found in the lesion site, which is different from normal tissue, so that early detection of the lesion and scientific and reasonable treatment can not only cure the disease, but also reduce the treatment cost.

Extended data

Classification of CT examination

CT diagnosis is generally plain CT scan, enhanced CT scan and cisternography CT.

CT plain scan is generally a cross-sectional scan, which takes the auditory canthus line as the baseline and scans up or down in turn.

The contrast agent commonly used in enhanced CT scanning is iodine contrast agent, which is 1.5 ~ 2.0 ml per kilogram of body weight. Anyone with a history of iodine allergy and heart and kidney failure is prohibited.

Cerebral cisternography CT usually injects nonionic contrast agent or gas through lumbar puncture or cisterna magna puncture to fill the cisterna.

When doing abdominal CT examination, you should fast before the examination; Oral dilute iodine solution sets off the outline of organs; During the examination, the patient needs to hold his breath and scan.

Middle ear cancer can be manifested as bone destruction centered on the middle ear, complete disappearance of ossicles and local soft tissue masses.

The CT manifestations of sinusitis are mucosal thickening, increased density in the cavity and formation of effusion or pus.

On plain scan, most liver cancers show low density areas.

The CT manifestations of liver cirrhosis include uneven liver surface, unbalanced proportion of each lobe, uneven density of liver parenchyma and splenomegaly.

Patients with acute pancreatitis showed subchronic enlargement, deformation and blurred edge of pancreas, disappearance of peripancreatic fat layer and thickening of renal fascia. Chronic patients show enlargement or contraction, deformation and calcification of pancreas, enlargement of pancreatic duct and thickening of renal fascia.

The bronchi of bronchiectasis patients can be columnar, cystic or mixed on CT.

CT showed that there was an arc shadow on the inner surface of the chest wall, suggesting the existence of pleural effusion.

Features of enhanced CT

On the morning of enhanced scanning, the fasting skin test should be negative, and there are no obvious contraindications such as hypertension, cardiac insufficiency and renal insufficiency. The prices of medicines used are different, and the prices of different machines in different regions are also different.

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