1970年,医学博士和研究科学家Raymond Damadian发现了使用磁共振成像作为医学诊断工具的基础。他发现不同种类的动物组织会发出长度不同的反应信号,并且癌组织会发出比非癌组织持续更长时间的反应信号。不到两年后,他向美国专利局提交了使用磁共振成像作为医学诊断工具的想法,题为“用于检测组织中癌症的装置和方法”。 1974年授予专利,这是世界上第一个在MRI领域发布的专利。到1977年,Damadian博士完成了第一台全身MRI扫描仪的建造,他将其称为“不屈不挠”。磁共振成像的医学用途迅速发展。健康的第一台MRI设备于20世纪80年代初开始供应。 2002年,全世界约有22 000台MRI摄像机在使用,并进行了超过6000万次MRI检查。水占人体重量的三分之二左右,这种高含水量解释了为什么磁共振成像已广泛应用于医学。组织和器官之间的含水量存在差异。在许多疾病中,病理过程导致水含量的变化,这反映在MR图像中。利用先进的计算机处理检测细胞核振荡的微小差异,可以建立反映组织化学结构的三维图像,包括水分含量和水分子运动的差异。这导致在所研究的身体区域中组织和器官的非常详细的图像。以这种方式,可以记录病理变化。水是由氢和氧原子组成的分子。氢原子的核能够作为微观罗盘针。当身体暴露在强磁场中时,氢原子的核被引导到“注意力”的阶段。当受到无线电波脉冲的影响时,原子核的能量含量会发生变化。在脉冲之后,当核返回其先前状态时发射共振波。

美国弗吉尼亚医学Assignment代写:磁共振成像MRI

In 1970, Raymond Damadian, a medical doctor and research scientist, discovered the basis for using magnetic resonance imaging as a tool for medical diagnosis. He found that different kinds of animal tissue emit response signals that vary in length, and that cancerous tissue emits response signals that last much longer than non-cancerous tissue. Less than two years later he filed his idea for using magnetic resonance imaging as a tool for medical diagnosis with the U.S. Patent Office, entitled “Apparatus and Method for Detecting Cancer in Tissue.” A patent was granted in 1974, it was the world’s first patent issued in the field of MRI. By 1977, Dr. Damadian completed construction of the first whole-body MRI scanner, which he dubbed the “Indomitable.” The medical use of magnetic resonance imaging has developed rapidly. The first MRI equipment in health was available at the beginning of the 1980s. In 2002, approximately 22 000 MRI cameras were in use worldwide, and more than 60 million MRI examinations were performed. Water constitutes about two-thirds of the human body weight, and this high water content explains why magnetic resonance imaging has become widely applicable to medicine. There are differences in water content among tissues and organs. In many diseases, the pathological process results in changes of the water content, and this is reflected in the MR image. The small differences in the oscillations of the nuclei are detected with advanced computer processing, it is possible to build up a three-dimensional image that reflects the chemical structure of the tissue, including differences in the water content and in movements of the water molecules. This results in a very detailed image of tissues and organs in the investigated area of the body. In this manner, pathological changes can be documented. Water is a molecule composed of hydrogen and oxygen atoms. The nuclei of the hydrogen atoms are able to act as microscopic compass needles. When the body is exposed to a strong magnetic field, the nuclei of the hydrogen atoms are directed into order—stand “at attention”. When submitted to pulses of radio waves, the energy content of the nuclei changes. After the pulse, a resonance wave is emitted when the nuclei return to their previous state

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