妇产科超声(b超)培训 超声成像的原理及诊断基础（Ultrasound in obstetrics and gynecology (B Ultrasound) and the principle of ultrasonic imaging diagnosis based training）.docVIP

妇产科超声(b超)培训 超声成像的原理及诊断基础（Ultrasound in obstetrics and gynecology (B Ultrasound) and the principle of ultrasonic imaging diagnosis based training） The principle and diagnostic basis of ultrasonic imaging (1) the principle of ultrasonic imaging (ultrasonic imaging) is the use of ultrasonic acoustic imaging. It includes pulse echo type acoustic imaging (pulse echo) Acoustical, imaging) and transmission mode acoustic imaging (transmission Acousticalimaging). The former is an acoustic imaging method for transmitting pulse sound waves and receiving echoes to obtain object images. The latter is an acoustic imaging method for obtaining object images by means of transmitted sound waves. At present, pulse echo type acoustic imaging is used in clinical diagnostic instruments. Some imaging methods for transmission mode imaging are still under study, such as certain types of ultrasonic cT imaging (computedtomographbyultrasound). At present, there is a large number of acoustic cT imaging (computedtomogr) APH Ofacoustic Velocity) harmonic attenuation CI, (computed, tomog~, attenuation, APH, of, acoustic, etc). Medical ultrasonic imaging at present is the use of ultrasonic irradiation in human body, by receiving and processing with properties of human tissue or structure information of the echo, methods and technology of visible image properties and the structure of human tissue. Compared with other imaging technologies, it has its own unique advantages and can not be replaced by other imaging. 1. high resolution of soft tissue in human tissues, on the same frequency sound waves and light waves, the wavelength is about 106 times larger than the latter, the resolution is much lower than the apparent acoustic imaging optical imaging. Ultrasound imaging, however, can provide opaque images of tissues and organs in the human body, which can not be resolved by light. X-rays also give a perspective view of human tissue, but its resolution on soft tissues is poor. As mentioned earlier, as