@article{oai:repo.qst.go.jp:00044333,
 author = {Endo, Masahiro and Tsunoo, Takanori and Kandatsu, Susumu and Tanada, Shuji and Aradate, Hiroshi and Saito, Yasuo and 遠藤 真広 and 角尾 卓紀 and 神立 進 and 棚田 修二},
 issue = {1},
 journal = {Radiation Medicine},
 month = {Jan},
 note = {Four-dimensional computed tomography (4D CT) is a dynamic volume imaging system of moving organs with an image quality comparable to that of conventional CT.  4D CT will be realized by several technical breakthroughs for dynamic cone-beam CT: (1) a large-area two-dimensional (2D) detecotr; (2) high-speed data transfer system; (3) reconstruction algorithms; (4) ultra-high-speed reconstruction computer; and (5) high-speed, continuously rotating gantry.  Among these, development of the 2D detector is one of the main tasks because it should have as wide a dynamic range and as high a data acquisition speed (view rate) as present CT detectors.  We are now developing a 4D CT scanner together with the key components.  It will take one volume image in 0.5 sec with a 3D matrix of 512x512x512.  This paper describes the concepts and designs of the 4D CT system, as well as preliminary development of the 2D detector.},
 pages = {17--22},
 title = {Four-dimensional computed tomography (4D CT) - Concepts and preliminary development},
 volume = {21},
 year = {2003}
}