Title:
2つの平行な端部導体を持つ無線周波数コイル
Document Type and Number:
Japanese Patent JP2005506167
Kind Code:
A
Abstract:
A radio-frequency coil (RF-coil) ( 19 ) for use in a magnetic-resonance imaging apparatus comprises a number of parallel bar-shaped electric conductors ( 37 ) arranged at regular intervals on an imaginary cylinder ( 39 ) and surrounded by a radio-frequency shield (RF-shield) ( 49 ). The bar-shaped conductors surround a measuring volume ( 11 ) and are interconnected at least at one of their end portions ( 41, 45 ) by an electric end conductor ( 43, 47 ) extending in a plane transverse to the bar-shaped conductors. A further electric end conductor ( 51, 53 ) is arranged near and parallel to the end conductor ( 43, 47 ), and is electrically connected to the RF-shield ( 49 ), preferably by a flange-shaped electric conductor ( 55, 57 ). The end conductor ( 43, 47 ) and the further end conductor ( 51, 53 ) together form a transmission line. An unwanted electromagnetic field (b1) generated by current in the end conductor ( 43, 47 ) is compensated for by an electromagnetic field (b2) generated by the current in the further end conductor ( 51, 53 ). Thus, the electromagnetic field of the end conductor ( 43, 47 ) does not lead to unwanted dissipation effects and temperature increases in the body of a patient present in the measuring volume ( 11 ).
Inventors:
Hole Elke
Application Number:
JP2003538762A
Publication Date:
March 03, 2005
Filing Date:
October 17, 2002
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G01R33/422; A61B5/055; G01R33/34; (IPC1-7): A61B5/055; G01R33/34; G01R33/422
Attorney, Agent or Firm:
Susumu Tsugaru
Akihiko Miyazaki
Fueda Shusen
Akihiko Miyazaki
Fueda Shusen