公开(公告)号：EP0153531B1

公开(公告)日：1989-02-15

申请号：EP84308531.7

申请日：1984-12-07

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Butson, Peter Charlton

IPC: H01F7/20

CPC classification number: G01R33/34069 ,  G01R33/34076

公开(公告)号：EP0153531A2

公开(公告)日：1985-09-04

申请号：EP84308531.7

申请日：1984-12-07

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Butson, Peter Charlton

IPC: H01F7/20

CPC classification number: G01R33/34069 ,  G01R33/34076

Abstract: A coil arrangement for generating a high frequency magnetic field in a generally cylindrical volume, e.g. for use in an NMR imaging apparatus, comprises a plurality of conductors (11, 13, 15, 17, 19) extending generally parallel to the axis of the volume at spaced positions around the volume and connection means (25, 27, 29) whereby the conductors are connected in electrically parallel paths for energisation from a common source (S). The paths are arranged to have a high self-resonant frequency compared with the frequency of the source, e.g. by being arranged each to comprise a single turn only, and the impedances of the paths are arranged to differ so that when energised the fields produced by the individual conductors combine to produce a resultant desired field distribution. By having parallel paths of high self-resonant frequency and different impedance the difficulty of providing a sufficient number of series connected turns distributed so as to obtain a desired field distribution without having a low self-resonant frequency is avoidad.

公开(公告)号：EP0162534A1

公开(公告)日：1985-11-27

申请号：EP85301116.1

申请日：1985-02-20

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Butson, Peter Charlton

IPC: G01R33/22

CPC classification number: G01R33/34046

Abstract: A coil arrangement for use in generating and detecting nuclear magnetic resonance (NMR) in a body, e.g. an NMR imaging apparatus, which comprises a conductor arrangement which can be used both as an RF field generating coil and an orthogonally polarised RF field detecting coil. The arrangement comprises a plurality of non-magnetic electrically conductive paths (34 to 50) extending generally parallel to the axis of a cylindrical volume, and means (51, 53) interconnecting the paths at each of their ends. An input signal applied to diametrically opposite paths (36 and 46) causes currents to flow in loops formed by the paths and interconnections so as to produce a field directed perpendicular to the axis of the volume, and an output for application to a detector is derived from diametrically opposite paths (31 and 41) which are orthogonal to the paths to which the input signal is applied so that zero current is induced in them by the field produced by the input signal.

公开(公告)号：EP0162534B1

公开(公告)日：1989-04-12

申请号：EP85301116.1

申请日：1985-02-20

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Butson, Peter Charlton

IPC: G01R33/22

CPC classification number: G01R33/34046

公开(公告)号：EP0153531A3

公开(公告)日：1985-12-18

申请号：EP84308531

申请日：1984-12-07

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Butson, Peter Charlton

IPC: H01F07/20

CPC classification number: G01R33/34069 ,  G01R33/34076

Abstract: A coil arrangement for generating a high frequency magnetic field in a generally cylindrical volume, e.g. for use in an NMR imaging apparatus, comprises a plurality of conductors (11, 13, 15, 17, 19) extending generally parallel to the axis of the volume at spaced positions around the volume and connection means (25, 27, 29) whereby the conductors are connected in electrically parallel paths for energisation from a common source (S). The paths are arranged to have a high self-resonant frequency compared with the frequency of the source, e.g. by being arranged each to comprise a single turn only, and the impedances of the paths are arranged to differ so that when energised the fields produced by the individual conductors combine to produce a resultant desired field distribution. By having parallel paths of high self-resonant frequency and different impedance the difficulty of providing a sufficient number of series connected turns distributed so as to obtain a desired field distribution without having a low self-resonant frequency is avoidad.