@inproceedings{oai:repo.qst.go.jp:00053271,
 author = {森, 慎一郎 and 遠藤, 真広 and 角尾, 卓紀 and 神立, 進 and 棚田, 修二 and 荒舘, 博 and 斉藤, 泰男 and 宮崎, 博明 and 佐藤, 一雅 and 松下, 聡 and 日下部, 正宏 and 森 慎一郎 and 遠藤 真広 and 角尾 卓紀 and 神立 進 and 棚田 修二 and 佐藤 一雅 and 松下 聡 and 日下部 正宏},
 book = {日本医学物理学会報文集},
 month = {},
 note = {This work was carried out to evaluate the basic performances for 4 dimensional computed tomography (4D-CT) scanner, which employs continuously rotating cone-beam.  The performances were evaluated with the same method as the conventional CT, because the standard method of evaluating 4D-CT has not yet been established, and we think this result was helpful to establish it.  4D-CT scanner can give dynamic volume imaging data continuously and with high-speed.  It uses a wide-area 2D detector designed on the basis of the present CT technology.  The number of elements are 912(channels) x 256(segments), element size is approximately 1mm x 1mm, scanning time is 1sec, and data sampling rate is 900 views (frames)/sec. Feldkamp (FDK) algorithm was used for reconstruction.  We measured six items as follows with stationary phantoms for 4D-CT, and compared them with the results of conventional multi-detector CT.  1.Noise, 2.Distortion, 3.Low Contrast and High Contrast resolution, 4.Spatial resolution, 5.Artifact, 6.Exposure dose measurement. The results were isotropic except for the evaluation of distortion in which small distortions gradually appeared as coming off the center of phantom in axial direction.},
 title = {The basic performance evaluation of the first model of 4 dimensional CT Scanner.},
 year = {2003}
}