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탄성 영상법 개발을 위한 유연성 높은 초음파 시스템의 구현
김동인,이수열,조민형,Kim, D.I.,Lee, S.Y.,Cho, M.H. 대한의용생체공학회 2012 의공학회지 Vol.33 No.1
Recently, several ultrasound imaging techniques for tissue characterization have been developed. Among them, ultrasound elastography is regarded as the most promising modality and has been rapidly developed. One of ultrasound elastography techniques is shear modulus imaging. Normal and cancerous tissues show big difference of shear moduli and they have good image contrast. However shear wave elastography requires more complicated hardware and more computations for image reconstruction algorithm. Therefore new efficient techniques are being developed. In this paper, we have developed a very flexible ultrasound system for elastography experiments. The developed system has capabilities to acquire ultrasound RF data of all channels and generate arbitrary ultrasound pulse sequences. It has a huge amount of memories for RF data acquisition and a simple and flexible pulse generator. We have verified the performance of the system showing conventional B-mode images and preliminary results of elastography. The developed system will be used to verify our own reconstruction algorithm and to develop more efficient elastography techniques.
신병철(B.C.Shin),김동인(D.I.Kim),이재기(J.K.Lee),김창수(C.S.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
To reduce particulate matter(PM) effectively from diesel emissions, high pressure injection technique has been introduced. Electronic unit injector(EUI) differs from conventional fuel injection system, in that EUI assembles plunger, nozzle, and housing together and forms like a unit type. As getting rid of fuel pipe, dead volume can be decreased. So EUI generates high pressure over 1500bar. and make rapid spill possible at the same time. EUI employs solenoid valve, which can electronically control injection timing and fuel injection quentity. it doesn't need governor and timer anymore.<br/>