MRI uses a specific frequency of radiofrequency pulses to excite materials containing specific nuclei with non-zero spins in a magnetic field to generate nuclear magnetic resonance. On this basis, an induction coil is used to collect signals and process them to establish the imaging method of a digital image according to certain mathematical methods.
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MRI equipment consists of a magnet system, a spectrometer system, a computer reconstruction, and an image display system, in which the spectrometer system is the control center of MRI. As MRI technology matures and its application range is increasing, it has become a routine medical examination method, widely used in the diagnosis of Parkinson's disease, multiple sclerosis, and cancer.
Strengths of MRI
The essence of MRI is to use the magnetic resonance effect of hydrogen nuclei in the human body, so it has a good imaging effect for tissues with high water content such as the brain, spine, lumbar spine, and joints. MRI uses a static magnetic field and radiofrequency magnetic field to image human tissues, in which neither electron ionizing radiation nor contrast agent is used to obtain high-contrast clear images. MRI has the advantages of high resolution of soft tissues and no radiation damage, making it irreplaceable in infant development and skeletal ligament strain.
In addition to providing proton density images that can display anatomical features, MRI can also accurately measure the nucleus relaxation times T1 and T2 with the help of the principle of magnetic resonance, which can reflect the information about the chemical structure in human tissues. The image reconstructed by the computer with this information is a component image, which can display the same density of different tissues and different chemical structures of the same tissue through image display, such as early detection of organ abnormalities, lesions, and tissue necrosis.
The Number of Domestic MRI Equipment Continues to Grow, But There Is Still A Lot of Room for Development
At present, the annual increase in the MRI equipment market in China is relatively stable, at about 1,000 units. As of the end of 2018, the number of MRI equipment in China reached 9357 units. With the increase in the installed capacity of MRI, the number of MRI equipment per million people in China has increased from 3.3 in 2013 to 6.7 in 2018.
However, from the perspective of per capita ownership, China's current MRI equipment ownership is still relatively low compared with developed countries. As of the end of 2017, the United States and Germany had 37.6 and 34.5 MRI equipment per million people, respectively. Other major developed countries also had more than 10 MRI equipment per million people. In the same year, the amount of MRI equipment per million people in China was less than one-fifth of the United States.
1.5T Is Currently the Main Domestic, and 3.0T Is the Development Trend
MRI equipment industry in China started late, with mid-to-high-end products currently accounting for 90%, and the overall market is basically monopolized by the three major foreign companies. According to market statistics, in 2017, China's medical magnetic resonance imaging equipment accounted for 53% of mid-range products, high-end products accounted for 37%, and low-end products accounted for only 10%, in which Siemens, GE, and Philips rank the top three in terms of market share among first-level hospitals.
From the model point of view, the MRI equipment owned by domestic hospitals is mainly 1.5T products, and as of the end of 2017, the proportion has exceeded 50%; 3.0T products with higher performance are more expensive, and the current holdings are relatively low, only 15 %; The market distribution of other field strength products is relatively fragmented.
1.5T equipment is currently the mainstream in the market, which meets the clinical needs of hospitals. Domestic MRI equipment manufacturers have launched 1.5T products. where domestic brands compete with international giants. Although international giants still occupy more than 50% of the market share, the localization rate is continuously increasing, with large room for substitution.
At present, the domestic high-end magnetic resonance imaging equipment field is mainly monopolized by international giants. With the popularity of 1.5T equipment, the installed capacity of 3.0T equipment will show an increasing trend.
According to the scale of operation and market share, MRI equipment manufacturers in the domestic market can be divided into three categories. The first category is multinational medical device companies, including GE Healthcare, Siemens, and Philips, all of which possess high R&D, integration, and sales capabilities of software products and hardware equipment. In addition to covering major large-scale medical imaging diagnostic equipment, their product lines also have many achievements in other types of medical device products. At present, multinational medical device companies occupy a relatively high market share in China's large-scale medical imaging diagnostic equipment; The second category is domestic excellent medical device companies such as Shanghai United Film and Best, with brands and technologies becoming more mature and quality of products comparable to imported equipment. With high-quality after-sales service, domestic medical device companies are welcomed by more medical institutions; The third category is mainly small-scale companies with weaker technical capabilities, lower-end products, and weaker competitiveness.
The 3.0T imaging system is a high-end MRI system for clinical or scientific research, which represents the frontier of the field of magnetic resonance technology with high technological content, wide clinical application, and great demand. Since 2001, the United States and other Western countries have taken the development of high magnetic fields as their direction. After the US FDA approved the use of 3.0T and 4.0T magnetic resonance imaging systems in clinical practice, GE Healthcare, some Western enterprises launched official 3.0T products, including GE, Siemens Medical, and Philips have successively, all of which master the core technology of 3.0T magnetic resonance imaging system. Among domestic brands, only a few have obtained CFDA product registration certificates.
At this stage, the domestic market is performing well in the replacement of mainstream MRI equipment. In the future, with the popularization of 1.5T products and the continuous advancement of technology, the market demand for 3.0T products will gradually release. With the continuous establishment of a sound medical system in China, the domestic MRI industry is expected to set sail in a good environment.
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