- 著者
- Satoshi Kobayashi Toshiya Osanai Taku Sugiyama Noriyuki Fujima Ryo Takagi Isao Yokota Akiyoshi Hamaguchi Toshitaka Nakamura Kazutoshi Hida Miki Fujimura
- 出版者
- The Japanese Society for Neuroendovascular Therapy
- 雑誌
- Journal of Neuroendovascular Therapy (ISSN:18824072)
- 巻号頁・発行日
- pp.oa.2023-0001, (Released:2023-05-17)
- 参考文献数
- 20
Objective: In endovascular treatment, it is important to evaluate the access route for placing a catheter into the common carotid artery (CCA) promptly and safely prior to the procedure. We examined whether non-contrast MRA using time-spatial labeling inversion pulse (Time-SLIP) can be used in patients prior to endovascular thrombectomy for acute ischemic stroke. We compared Time-SLIP MRA to contrast-enhanced (CE) MRA and evaluated the efficacy in the evaluation of access routes.Methods: We retrospectively reviewed 31 patients admitted between October 2018 and December 2018 for cerebral infarction at our hospital. Blood vessels were imaged from the aortic arch to the CCA. A radiologist blindly evaluated quality score, stenosis, shape of the aorta, and degree of tortuosity.Results: There were no “non-diagnostic” images. The sensitivity, specificity, positive predictive value, and negative predictive value for stenosis were 83%, 96%, 83%, and 96%, respectively. The sensitivity for the aorta type classification was 100%. The sensitivity for mild tortuosity was 93%, for moderate was 100%, and for severe was 100%.Conclusion: Time-SLIP MRA can be an alternative to CE MRA in access route assessment for patients with cerebral infarction who are not eligible for acute thrombectomy therapy.
- 著者
- Masao WATANABE Takahiro SHIMIZU Ryo TAKAGI
- 出版者
- The Japan Society of Mechanical Engineers
- 雑誌
- The Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH (ISSN:24243167)
- 巻号頁・発行日
- pp._3D23-1_-_3D23-8_, 2015-11-09 (Released:2017-06-19)
Urban railway lines, upon which large conurbations crucially depend, suffer from chronic congestion and prolonged travel times during peak hours, and improvement of capacity and reduction in travel times are desperately needed. Also, competition with other modes of transport is ever intensifying. These necessitate the realization of a very high performance railway, called in this paper as "ultra-convenient rail transport" (UCRT), which can provide services that much better fit individual passengers' needs. Because needs of the passengers are very diverse, so should the services provided by UCRT. This naturally leads to the conclusion that ultra-high frequency operation is essential for UCRT. In this paper, the authors present the discussions on possible new technologies that can be used to realize UCRT, and the impact they may have on the attractiveness of the services provided by the new railway system. The techniques upon which the authors would discuss in this paper are: (1) moving block signalling systems, (2) on-board turnouts and (3) soft coupling. In the discussion, the pure moving block system (PMB) which stands inside the so-called 'brick wall' assumption and the relative moving block system (RMB) that breaks the 'brick wall' assumption are compared, and significant improvements in performance may be achieved when RMB is combined with on-board turnouts. These techniques contribute to further reduction of headways between trains, and thus contribute to the realization of UCRT.