What is the essential difference between CT and X-ray? Can CT replace X-rays?X-rays can only see projections, so sometimes films are taken from two different directions for doctors to locate the affected area, which is generally used for bone testing or gastrointestinal imaging (diagnosis of gastric ulcers). In addition, the so-called DSA technology can assist vascular surgery, and the principle of application is also X-ray transmission.
CT is a tomographic imaging of the target site, which can be subsequently reconstructed by a computer.
The choice of X-ray and CT is mainly based on demand, economy and radiation dose. For example, the examination of fractures does not require the cost of CT, nor does it need to expose too much radiation, so X-rays are still the first choice. In dentistry, the entire oral cavity needs to be modeled, and the understanding of three-dimensional space is required, so CT is used. Therefore, there is also the development of low-dose CT. The purpose is to sacrifice a certain resolution so as to reduce the radiation dose to the patient as much as possible. It has been used in the examination of oral cavity and breast.
X-rays will not be completely replaced by CT, this examination method has its own uniqueness.
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