Computed tomography - Hospital Medical Information

Justice
Computed tomography ( CT ) is performed by taking a large circular machine with an X-ray generator and taking a cross-sectional image of the human body, as opposed to a simple X-ray . CT has the advantage that structures and lesions can be seen more clearly because the structures do not overlap with each other compared to simple X-ray. It is the primary test when most of the organs and diseases are suspected and need to be performed.

In terms of obtaining a cross-sectional image, the MRI and the CT are in common, but the CT acquires the image using the X-ray, and the MRI acquires the image by transferring the high frequency in the magnetic field. In addition, CT has the advantages of lower examination cost and shorter examination time than MRI . On the other hand, MRI has a higher expression and contrast of soft tissue than CT , and is the basis for diagnosis of muscle , ligament , and parenchymal lesion.

Previously, MRIThe cross-sectional surface, as well as that the same may be freely acquiring an image of the desired cross section CT jyeoteuna plugged with advantages over the recent years, a multi-channel CT ( MDCT , multi - detector CT ) is loaded as the reconstructed after the photographed image MRI desired cross section, as And three-dimensional (3D) images can be freely obtained.


Kinds
Abdominal computed tomography ( CT ), brain computer tomography ( CT ), head and neck computed tomography ( CT ), sinus computed tomography ( CT ), a computer-to-computer tomography ( CT ), cardiac computed tomography ( CT ), chest computer tomography ( CT ), spine computed tomography ( CT )

Inspection cycle
There is no special inspection cycle, but when there is a symptom or suspicion of lesion at the site, it is taken.

Preparations
In some cases, a contrast medium is injected intravenously and the test is performed. In such cases, vomiting may sometimes occur. Therefore, when performing a contrast enhancement test, it is necessary to fast for 6 hours before the test to prevent aspiration (oral or stomach contents entering the lung through the airway) during the unconscious test. When taking abdominal images, take a picture after drinking water or oral contrast agent as occasion demands. Computed tomography ( CT before) test in wearing the dressing, most outerwear and transfer to the cotton fibers a gown, wherein Figure dressing as undergarment pieces of metal.

method of inspection
Lie on a bed of a computed tomography ( CT ) machine according to the instructions of the radiologist . Immediately, intravenous contrast medium is injected as needed.

Scene of Computerized Tomography (CT)
Scene of Computerized Tomography (CT)
Time
It takes 10 ~ 20 minutes.


Precautions
Do not move the camera as required by the radiologist when taking a picture. The radiologist will announce the patient to hold his / her breath for about 10 to 30 seconds. At this time, he / she should breathe well and obtain a clear CT image .

result
Computed tomography ( CT ) is a Department of Radiology , and that the doctor read, in large hospital brain, head and neck, chest, heart , abdomen, etc. There have a separate Radiology specialist to it as a professional by long-term, respectively they are computer tomography ( CT a) read do. CT lesions, such as carcinomas, are mostly enhanced by contrast agents and appear bright (whitish) compared to normal tissues and are distinguishable from normal tissues.

Side effects / after effects
The factors of the side effects due to imaging are largely due to contrast injection and X-ray exposure.

Contrast agents that are injected into the eye can sometimes cause hypersensitivity reactions such as itching or urticaria . If itching or urticaria occurs, talk to your doctor or radiologist and take appropriate action. Also, if you have had an irritation at the previous examination, you should tell your doctor or radiologist about it. Used when recording intravenous contrast medium is an iodine ( Iodine as a medicament containing a) component, the contrast agent should be given the differences in X-ray absorption of the soft tissue lesions and the normal tissue distinguish. However, due to hypersensitivity to iodine, about 1 in 70,000 to 80,000 people die. However, since the importance of the test is high, it is recommended that the test and contrast agent be injected even at such a risk. It is also a factor of contrast medium is temporarily decreased kidney function If you have more kidney function is reduced, in which case the checks performed transition is necessary and appropriate measures after implementation.

While we are living in our daily lives, we are exposed to radiation by cosmic radiation or naturally occurring radioactive material, which is generally about 2 to 5 mSv per yearRespectively. If you live in a high mountain area, you are exposed to radiation of about 1.5 mSv per year more than those who live at sea level. If you travel by air, you are exposed to radiation of about 0.3 mSv . As such, radiation doses by cosmic rays vary greatly depending on altitude. In addition, the most common sources of radiation in our daily lives are caused by radon ( natural gas such as radon , soil, sand, rock, minerals and building materials made of these materials) 2 mSv .

In the case of computed tomography ( CT ), the dose is 2 to 10 mSv depending on the technique of photography, and is the radiation dose in daily exposure for about 8 months to 3 years. Considering the risks of exposure to the test and the benefits of doing the test, it is a quantity that does not cause great harm.

It is known that radiological examinations performed by chance during pregnancy generally do not have a significant effect on the growth and development of children, and that the occurrence of serious diseases or other complications is less likely to occur. However, avoid unnecessary radiation exposure during pregnancy. You should tell your doctor or radiologist if you are pregnant or if you are pregnant. Chest, Tofu and Limb CTIt is preferable to minimize the X-ray irradiation of the fetus by wearing a skirt made of lead even in this case, although the X-ray is not directly irradiated to the fetus because the irradiation is avoiding the uterus .

Diagnostic disease
Almost all organs such as head and neck, lung, esophagus , mediastinum, liver, gastrointestinal tract, and bones

. It is also helpful to identify tumor diseases and trauma in almost all organs such as head and neck, lung, esophagus, mediastinum, liver, gastrointestinal tract, and bone.