著者
土橋 俊男 藤田 功 岩崎 淳 森 克彦 鈴木 健
出版者
公益社団法人 日本放射線技術学会
雑誌
日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日
vol.58, no.3, pp.406-412, 2002-03-20 (Released:2017-06-30)
参考文献数
8
被引用文献数
1 1

During this project, we evaluated methods to prevent high-signal artifact (marching metal artifact) that are caused by magnetic substance. Marching metal artifact is caused by the resonance frequency created by magnetic substance. Phase encoding and frequency encoding are often switched to minimize the influence that marching metal artifact have on the image. However, this method will only change the position at which marching metal artifact occur. It does not have the ability to completely prevent marching metal artifact. Our research illustrated that marching metal artifact can be prevented by changing the strength of the slice selective gradient field at the 90° RF pulse and 180° RF pulse. In other words, marching metal artifact can be prevented by changing the frequency bandwidth for the 90° RF pulse and 180° RF pulse. The incorporation of the phase correct option in the device used for our research (SIGNA LX and SIGNA CV/i) results in different slice selective gradient field strengths at the 90° RF pulse and the 180° RF pulse. This indicates that the use of phase correction enables marching metal artifact to be prevented.