What is the difference between CT and filming!

1, CT: Computed tomography, using accurately collimated X-ray beams, gamma rays, ultrasonic waves, etc. And perform cross-sectional scanning around a specific part of the human body together with a high-sensitivity detector.

2. Photography: The structure of the inspected part can be clearly displayed on the X-ray film, and it can be kept as an objective record for a long time, so that it can be studied at any time or compared during re-inspection when necessary.

Second, the principle is different.

1, CT: a certain thickness of a certain part of human body is scanned by an X-ray beam, and the X-rays passing through this layer are received by a detector, converted into visible light, converted into electrical signals by photoelectric conversion, converted into digital signals by an A/D converter, and input into a computer for processing.

2. Shooting: hitting a metal target with accelerated electrons. During the impact, the electrons suddenly decelerate, and their lost kinetic energy (1%) will be released in the form of photons, forming a continuous part of the X-ray spectrum, which is called braking radiation. By increasing the accelerating voltage, the energy carried by electrons increases, which may knock out the internal electrons of metal atoms.

Third, the advantages and disadvantages are different.

1, CT: The equipment is relatively expensive, and the inspection cost is relatively high. The value of examination and diagnosis of some parts, especially qualitative diagnosis, is still limited. Therefore, CT examination should not be used as a routine diagnostic method, but should be reasonably selected and applied on the basis of understanding its advantages. In addition, the radiation dose of CT diagnosis is larger than that of ordinary X-ray machine, so pregnant women should not do CT examination. ?

2, filming: X-rays can also produce ionization and excitation in organisms, so that organisms have biological effects. Especially some highly proliferative cells will be stimulated, damaged or even necrotic after a certain amount of X-ray irradiation.

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