发明名称 |
Method for measurement of magnetic fields, method for production of gradient coils, gradient coil, and apparatus for magnetic resonance imaging |
摘要 |
For the purpose of realizing a method for measuring, after stopping application of a gradient magnetic field, the residual magnetic field and a method for manufacturing a gradient coil by causing the characteristics of the residual magnetic fields, revealed by the measurement, to be reflected in it, a magnetically resonant sample is arranged at a measuring point on the surface of an imaginary sphere in a measuring space; a gradient magnetic field is applied to the measuring space; RF excitation is carried out after stopping the application of the gradient magnetic field to measure FID signals generated by the sample; the magnetic field intensity is calculated on the basis of a difference in differentials of the phases of the FID signals; and a magnetic field intensity is fitted into a spheric surface function.
|
申请公布号 |
US6813513(B2) |
申请公布日期 |
2004.11.02 |
申请号 |
US20010827037 |
申请日期 |
2001.04.05 |
申请人 |
GE MEDICAL SYSTEMS GLOBAL TECHNOLOGY COMPANY, LLC |
发明人 |
GOTO TAKAO |
分类号 |
G01R33/385;A61B5/055;G01R33/48;G01R33/565;(IPC1-7):A61B5/05;G01V3/00 |
主分类号 |
G01R33/385 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|