论文部分内容阅读
磁共振成像(MRI)是影像学家族中的一个最新成员。它可以提供人体任意部位、任意方向的断层图像,没有电离辐射损害,空气和骨骼不会对图像造成伪影,可以说是影像诊断技术某些领域中的“大哥大”。但因其价格昂贵,成像原理复杂,即使从事多年放射专业的人亦较难理解。 简单地说,完成磁共振成像有三个步骤:1.把人体放入磁场,使人体磁化;2.发射合适频率的无线电波,使人体内磁化的氢质子产生共振;3.关闭无线电波,人体发出信号并被采集,重建图像。
Magnetic resonance imaging (MRI) is a newest member of the imaging family. It can provide any part of the body, any direction of the tomographic images, no ionizing radiation damage, air and bone will not cause artifacts on the image, it can be said that some areas of diagnostic imaging technology “big brother.” However, because of its high cost and complicated imaging principle, it is difficult to understand even radiographers engaged for years. In short, the completion of magnetic resonance imaging in three steps: 1. The human body into the magnetic field, the human body magnetization; 2. Launch the appropriate frequency of radio waves, the human body to produce hydrogen proton resonance; 3. Close the radio waves, the human body Send a signal and be collected to reconstruct the image.