What is the difference between CT/PECT/MRI in medical treatment? Additional points. Urgent! ! !

CT is a tomography scanner, which divides people into many faults, each layer has an image. The machine emits rays, and the rays pass through the body to produce images. Magnetic resonance is similar to CT, but it generates a magnetic field through the body to produce images, so the damage of MR to the human body is much less than that of CT. The inspection types of these two devices are similar, and they have their own advantages in images of different parts. PECT is a nuclear medicine examination equipment, which belongs to an independent nuclear medicine department instead of radiology, because its examination method is to inject radioactive drugs into the human body, and the human body emits rays, while the machine senses images through the rays emitted by the human body. It is completely different from CT and MR, so the generated image is also very different. PECT is generally a coarse image. The fineness of the image is not as good as that of CT/MR, but it is more effective in detecting diseases such as bone metastasis, so it has its special application.