Similarities and differences between x-ray and ct

From a professional point of view, ct is called computed tomography, and many people call X-ray ct ct. I just want to say:

Similarities:

X-ray photography, fluoroscopy and ct: all use the principle of attenuation when X-rays pass through the human body to capture the imaging after X-rays pass through the human body.

X-ray photography and perspective: overlapping images

X-ray photography, ct, magnetic resonance: static phenomenon, showing the image of human body at a certain moment.

Ct and MRI: Both are tomography, with different physical principles but the same mathematical principles, and both calculate tomographic images through graphic operations. If you look at the development history of magnetic resonance, you should know that when magnetic resonance scientists saw the tomography principle of ct, they were inspired and completed the invention of magnetic resonance imaging technology.

Difference:

Perspective is a dynamic phenomenon, which can observe the motion state.

Magnetic resonance: the magnetic field of the machine tool is large, and there are inspection coils around the body. These coils are equivalent to countless ultrasonic probes, but the vibration generated and collected is not ultrasonic waves, but a changing magnetic field.

As for looking at foreign bodies, X-rays can capture foreign bodies with obvious X-ray attenuation, such as metal foreign bodies and bone spurs between skin and muscles. The film is in a high-density shadow, and non-metallic foreign bodies such as plastic have the same density as soft tissue, so it is impossible to shoot! If there is a metal foreign body in the human body, never do an MRI! Because the strong magnetic field of magnetic resonance can make the metal foreign bodies in the body "crazy", which may be life-threatening.