发明授权
- 专利标题: Method and apparatus for mapping lines of nuclear density within an object using nuclear magnetic resonance
- 专利标题(中): 使用核磁共振在物体内映射核密度线的方法和装置
-
申请号: US926571申请日: 1978-07-20
-
公开(公告)号: US4297637A公开(公告)日: 1981-10-27
- 发明人: Lawrence E. Crooks , John C. Hoenninger, III , Mitsuaki Arakawa
- 申请人: Lawrence E. Crooks , John C. Hoenninger, III , Mitsuaki Arakawa
- 申请人地址: CA Berkeley
- 专利权人: The Regents of the University of California
- 当前专利权人: The Regents of the University of California
- 当前专利权人地址: CA Berkeley
- 主分类号: A61B10/00
- IPC分类号: A61B10/00 ; A61B5/055 ; G01R33/48 ; G01R33/50 ; G01N27/00
摘要:
Densities of resonant nuclei within elemental volumes along a line are measured using the nuclear magnetic resonance phenomenon called "spin echo." A first planar volume of nuclei is selectively excited to nutate spins by approximately 90.degree.. Thereafter a second planar volume of nuclei, transverse to the first planar volume, is selectively excited to nutate spins by approximately 180.degree.. The nuclei in the line volume common to both of the planar volumes thereafter generate characteristic spin echo signals. A magnetic gradient is established along this line volume during the spin echo read out so that the resultant spin echo signals can be processed to determine the respective densities of resonant nuclei along the line volume. Special pulsing sequences for rapidly effecting measurement of successive multiple line volumes and suitable apparatus for effecting such sequences are also described.