MRI inside the coil and permanent magnets (or superconducting magnets) is very expensive, high technical requirements, high quality coils sold at a very high price, and the domestic production of high-quality coils is rarely able to mass production of high-quality coils ..... CT is an upgraded version of DR, the main technical requirements in the probe and X-ray source, technical requirements are not so high, the domestic production capacity is relatively strong; MRI imaging software algorithms are the most complex, followed by CT, the simplest is the DR. MRI is divided into low-field permanent magnets (<1T), 1.5T superconducting, 3T superconducting, (T is Tesla, the unit of magnetic field strength), the cost of these three Respectively, roughly 200 ~ 800W, 500 ~ 1800W, 1500 ~ 3000W, excluding the cost of purchasing the machine itself, each MRI installation is required to obtain the machine configuration certificate issued by the Department of Health, these three types of MRI to obtain the configuration certificate of the difficulty of incremental, in particular, the 3T superconducting MRI, the general city of the second level on one or two. The Ministry of Health charges the three unit price is not too much difference. CT is divided into single-row, double-row, 4-row, 16-row, 64-row and super high-end 128-row (even 256<)...... The cost ranges from a few dozen W to two or three million, 64-row CT and 1.5T superconducting MRI price is about the same, ultra-high-end CT and 3T superconducting MRI price is about the same, the same due to the configuration of the certificate of the limitations of the ultra-high-end CT and the 3T superconducting MRI is as scarce. However, the single-row and double-row CT configuration certificate is very easy to obtain (some areas do not even need a configuration certificate), so most of the local and county hospitals are to buy cheap and low difficulty in the configuration of the certificate of the single-row and double-row CT to do the examination, the cost is naturally much lower than the MRI. Setting up the acquisition cost is mainly a single input cost, and the acquisition cost of these three devices is undoubtedly MRI > CT > DR three devices to check the purpose of the difference: MRI is characterized by the distinction between water and lipid contrast is high, CT tomography + enhancement of contrast can be aimed at the organs of the blood supply has a better diagnosis, X-ray is mainly for the coronary position of the disease screening and the diagnosis of bone disease. The running cost of manpower is minimal for X-ray, which can be performed by a trainee, while CT and MRI require a professional technician to perform.