What does the imaging equipment include?

X-ray: First, ordinary X-rays are basically only available in primary hospitals at the township level. Basically, the whole body can be examined, the most suitable ones are bones and chest, and the worst ones are head and pelvis. It has the highest spatial resolution and the lowest density resolution. X-rays with a kilovolt value below 40KV belong to soft X-rays, which are mainly suitable for soft tissue photography (such as breast). Second, digital imaging: CR: indirect digital imaging, with higher density resolution and lower spatial resolution. The biggest advantage is that the original ordinary X-ray equipment can be used to reduce the cost. DR: The density resolution is further improved, but the spatial resolution is reduced. Direct digital imaging is expensive, and all configurations need to be purchased again. 3. CT: X-ray computed tomography has higher density resolution and lower spatial resolution than ordinary X-ray. Because of its high density resolution, it can display many lesions with small contrast, so it is more suitable for the examination of systemic diseases, but the price is a bit expensive. Generally, the prices of CT models in county hospitals are basically above 200 yuan. Ultrasonic waves in other imaging aspects: The human body is mainly detected by ultrasonic waves (the sound waves that can be distinguished by human ears are 20-20,000 Hz, and those above 20,000 Hz are called ultrasonic waves). Ultrasonic waves have different reflections and refractions when passing through different human tissues (interfaces), and may be absorbed and attenuated in human tissues. There are mainly common ultrasound and color Doppler ultrasound (for cardiovascular system), and the advantage is that there is no radioactive radiation. Nuclear magnetic resonance: unaccustomed or incomprehensible. The main principle is that the human body is placed in a special magnetic field, and the hydrogen nucleus in the human body is excited by radio frequency pulses, so that the hydrogen nucleus vibrates and absorbs energy. After stopping the RF pulse, the hydrogen nucleus sends out a radio signal with a specific frequency, and releases the absorbed energy, which is collected by the receiver in vitro and processed by the electronic computer to obtain an image. Its spatial resolution is still not as good as that of ordinary amplifier, but its soft tissue density resolution is very high. For the brain (except acute cerebral hemorrhage), spinal cord and intra-articular structures, very clear.