当今社会,科学技术日新月异,许多高、精、尖的医疗器械不断推陈出新,尤其一些非常规医疗设备,如:应用正电子发射断层扫描装置(PET)、磁共振(MRI)、医用直线加速器等。它们的问世,为人类战胜病魔、征服医学疑难发挥了重要贡献。然而,大型医疗设备几乎被发达国家所垄断,造价极高? In today’s society, science and technology are changing with each passing day, and many high-precision, sharp-pointed medical devices continue to be innovative, especially in some non-conventional medical devices such as positron emission tomography (PET) devices, magnetic resonance imaging (MRI), and medical linear accelerators. Their advent has played an important role in helping mankind overcome disease and conquer medical problems. However, large-scale medical equipment is almost monopolized by developed countries, and the cost is extremely high.