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浏览/检索结果: 共4条，第1-4条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Accelerated susceptibility-based positive contrast imaging of MR compatible metallic devices based on modified fast spin echo sequences. 期刊论文 PHYSICS IN MEDICINE AND BIOLOGY, 2017 作者:  Shi, Caiyun;  Zhang, Yongqin;  Zhang, Xiaoyong;  Chen, Min;  Su, Shi 收藏  |  浏览/下载：26/0  |  提交时间：2018/02/02 Robust and fast SSFP for the evaluation of LV function at 3T 期刊论文 J Cardiovasc Magn Reson, 2013 作者:  Yin Wu;  Fan Yang;  Yiu-Cho Chung 收藏  |  浏览/下载：12/0  |  提交时间：2015/08/28 Driving techniques for high frame rate CCD camera (EI CONFERENCE) 会议论文 Electronic Imaging and Multimedia Technology V, November 12, 2007 - November 15, 2007, Beijing, China Guo W.; Jin L.; Xiong J. 收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25 This paper describes a high-frame rate CCD camera capable of operating at 100 frames/s. This camera utilizes Kodak KAI-0340  an interline transfer CCD with 640(vertical)480(horizontal) pixels. Two output ports are used to read out CCD data and pixel rates approaching 30 MHz. Because of its reduced effective opacity of vertical charge transfer registers  interline transfer CCD can cause undesired image artifacts  such as random white spots and smear generated in the registers. To increase frame rate  a kind of speed-up structure has been incorporated inside KAI-0340  then it is vulnerable to a vertical stripe effect. The phenomena which mentioned above may severely impair the image quality. To solve these problems  some electronic methods of eliminating these artifacts are adopted. Special clocking mode can dump the unwanted charge quickly  then the fast readout of the images  cleared of smear  follows immediately. Amplifier is used to sense and correct delay mismatch between the dual phase vertical clock pulses  the transition edges become close to coincident  so vertical stripes disappear. Results obtained with the CCD camera are shown.   实时操作系统在天文快读CCD上的应用 学位论文 硕士, 北京: 中国科学院研究生院（云南天文台）, 2007 作者:  王雪利 收藏  |  浏览/下载：17/0  |  提交时间：2016/04/08 QNX操作系统  DMA  数据采集  PCI  快读CCD