CT Scan

CT Scan
CT Scanner is a method of combining the use of ordinary tomography (tomography) with computer processing. This method also uses X-rays. Of course, the dose used in this method is very high and structural differences such as the use of X-ray lamp motion or motion detector, as well as sometimes circumferential detectors and so on. It has a normal radiography.
A CT scan shows images of different cross-sections at the desired depth of the body. In normal radiography, depth information was lost. On the other hand, he could not distinguish between soft tissues. Naturally, we did not need a little information about the density of tissues.
In conventional tomography, the first problem, the imaging of an arbitrary section, was solved, but computer tomography solved the other two problems of conventional radiography. This means that it has the sensitivity needed to distinguish between soft tissues and also gives little information about the rate of attenuation (caused by radiation passing through the tissues). Of course, in this method the resolution does not improve and only the unwanted parts become more blurry.
More than 75 million CT scans are used annually in the United States. According to one American journal, 2% of cancers (malignant types) are caused by high doses used in CT scans. The combination of PET and CT methods, known as PET/CT, is a new method in which anatomy information (derived from CT) and metabolic information related to function and components. (What PET gives us) is integrated and is a desirable method especially in the study of tumors.
The important point is that it is unnecessary to use a high dose of CT in this method. This method is used 85% in the study of tumors (differentiating malignant cells from benign cells, closely monitoring the progression of cancer cells and investigating response to treatment and radiotherapy), 10% in neurology and 5% in cardiac studies.