追梦1区14号
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医学影像技术是高新技术与医学的结合，自20世纪70年代起，以CT问世为标志，伴随计算机技术的进步，现代医学影像学取得了突飞猛进的发展，由传统单一普通X线加血管造影检查形成包括超声、放射性核素显像、X线CT、数字减影血管造影(DSA)、MRI、普通X线检查的数字化成像(CR和DR)以及图像存储和传输系统(PACS)多种技术组成的医学影像学体系。医学影像学已经由传统的形态学检查发展成为组织、器官代谢和功能诊断手段，医学影像学技术已经由既往"辅助检查手段"转变为现代医学最重要的临床诊断和鉴别诊断方法，使多种疾病的诊断更准确、及时。由于介入医学的兴起，医学影像学已经集诊断和治疗为一体，成为与外科手术、内科化学药物治疗并列的现代医学第3大治疗手段。目前，医学影像学科是现代化医院的支柱之一，影像学设备的价值占医院固定资产50%以上，医学影像学为临床医学的主要研究手段和推动现代医学不断发展的动力。
医学影像学是高新技术与医学的结合点，21世纪医学影像学发展首先依赖于以计算机为主导的高新技术的进步。由于计算机的性能以几何级数升级，必将带动多种医学影像学设备向小型化、专门化、高分辨率和超快速化方向发展，医学影像学检查亦将由大体水平逐渐深入至细胞、受体、分子和基因水平。近年来，美、欧、日等发达国家和地区在医疗影像诊断产业加强战略布局，旨在带动多种医学影像设备向小型化、专门化、高分辨率和快速化方向发展。目前，数字医疗影像技术的发展主要有如下几大趋势:
现代医学影像设备的发展将由最开始的形态学分析发展到携带有人体生理机能的综合分析。通过发展新的工具、试剂及方法，探查疾病发展过程中细胞和分子水平的异常。这将会为探索疾病的发生、发展和转归，评价药物的疗效以及分子水平治疗开启崭新的天地。同时，由于造影剂是影像诊断检查和介入治疗时所必需的药品，未来针对特定基因表达、特定代谢过程、特殊生理功能的多种新型造影剂也将逐步问世。
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The Analysis of the Professional Leon(此文是这个杀手不太冷的影评) The Meaning of Life—Hope The Professional Leon which is directed by Luc Besson is an attractive and affecting movie. It is a story about a professional killer and a 14-year-old girl. In my opinion, this film reflects the influence of hope in people’s lives. Life is a magic thing. It is like a thick forest and when we walk through it, we need hope to lead us. Hope can change one’s mind. Hope can change one’s first reason is the change between the settings from the beginning to the end. The film began with the oppressive cityscapes: roads, streets, alleys and then the screen turned dark. They are the characteristics of Film Noir. Besides, the protagonist Leon appeared from a black shot which is a special close-up. In addition, the following shot are fighting in some rooms. The whole beginning leads to a mood of cold and oppression. However, at the end of the film is a scene of orphanage. The sunshine illuminated the trees and the grass. The scene is bright and warm. Then the shot got far and far. This showed that life was going on and the sunshine brought us hope to live. The world turned peace again, and the mood turned soft and cozy. Therefore, the change of the beginning and the end showed the dark had gone and everyone got their hope. In this film, there is a symbol of hope-Leon’s evergreen. It ran through the whole film. The protagonist Leon, at fist, was a typical killer who was skillful and cold. The evergreen for him is the hope of life. It meant Leon’s valuable memory-the girl he loved. Everyday he cleaned the leaves of the evergreen carefully. He thought the evergreen was quiet and happy, so he took care of it as his most valuable thing. Actually, he lived in his memory and what he must protect is the hope-evergreen. For Leon, there was no meaning of the reality until he met the girl –Mathilda. When the girl implored Leon to open the door, he hesitated. Yes, of course. It was because everything would change since he opened the door. Actually, Leon was a simple, kind and attentive man who was not good at express himself. We can know that from watching old movie and ironing clothes. After accepting the girl, Leon chose the responsibility in his heart. His life changed because his hope changed. His living purpose was to protect the girl and revenge on Stan. Furthermore, his good-side was stimulated by the girl’s love. They were interdependent as a special relationship. I fact, Leon was not a killer any more since he met Mathilda. He was a real man. Another hope is reflected by Mathilda’s attitude of life. Mathilda’s family was inharmonious. She couldn’t feel love in this family, so she became unyielding and mature at an early age. She hated her relatives except her little brother. If she didn’t met Leon, her life would be out of imagination. When Leon opened the door, a light shone on Mathilda. This light of life is a symbol of change. Since she lived with Leon, she felt care from Leon, and she fell in love with him. She wanted to be with him forever. The hope of her life is Leon. She took care of their“home”and took care of him. When Leon ordered her go, she was in agony. She knew that she wouldn’t see him again. She was afraid that the hope of life would disappear. At last, she planted the evergreen near the orphanage, and the evergreen became her hope. She got a new view of this world, and she would cherish the memory of Leon who saved her life and soul. This story is a fairy tale of killer. The killer managed to protect his hope as the expanse of his life, whereas he died in comfort. Maybe, there is another dark world concealed near us. However, it is because the shine of hope has not illuminated it. And the meaning of life is the process of seeking hope.
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