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KR870007686A - 핵자기 공명 영상용 차폐 경도 코일 - Google Patents

핵자기 공명 영상용 차폐 경도 코일 Download PDF

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KR870007686A
KR870007686A KR870000914A KR870000914A KR870007686A KR 870007686 A KR870007686 A KR 870007686A KR 870000914 A KR870000914 A KR 870000914A KR 870000914 A KR870000914 A KR 870000914A KR 870007686 A KR870007686 A KR 870007686A
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coil
hardness
coils
magnetic field
cylinder
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KR870000914A
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KR900000844B1 (ko
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버나드 로머 피터
스미스 히키 죤
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아더엠 킹
제너럴 일렉트릭 캄파니
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/42—Screening
    • G01R33/421—Screening of main or gradient magnetic field
    • G01R33/4215—Screening of main or gradient magnetic field of the gradient magnetic field, e.g. using passive or active shielding of the gradient magnetic field

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Abstract

내용 없음

Description

핵자기 공명 영상용 차폐 경도 코일
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음

Claims (12)

  1. 복수의 코일을 포함하는 MR장치용 경도 코일 셋트에서, 상기 각 코일은 각 표면 전류 분배를 제공하도록 적용되며, 상기 표면 전류 분배로부터의 자체는 상기 코일 셋트의 내부에서 예정된 영역에서 예정된 경도를 표시하며 상기 코일의 외부에서는 실제적으로 제로값을 표시하는 것을 특징으로 하는 핵자기 공명 영상용 경도 코일 셋트.
  2. 제 1 항에 있어서,
    상기 각 코일이 원통형태인 것을 특징으로 하는 경도 코일 셋트.
  3. 제 2 항에 있어서, 상기 각 코일이 각 인쇄회로 기판상에 엣칭된 권선을 포함하는 것을 특징으로 하는 경도 코일 셋트.
  4. 제 1 항에 있어서,
    상기 코일은 직렬로 접속되고 상기 코일 셋트는 단일 전원으로부터 작동 전류를 수신하도록 적용된 것을 특징으로 하는 경도 코일 셋트.
  5. 자계를 발생시키는 코일 시스템이,
    반경(ri)과 축길이(zi)를 가지는 제 1 원통의 표면상에 제1표면 전류를 제공하도록 전류원에 접속되는 제 1 코일과,
    축길이(oz)와 ri보다 더 큰 반경(ro)을 가지며 상기 제 1 원통과 실제적으로 동축인 제 2 원통의 표면상에 제2표면 전류를 제공하도록 전류원에 접속된 제2코일을 포함하며,
    상기 제 1 및 제 2 표면 전류는 예정된 디멘죤에 예정된 경도를 가지며 상기 제 1 코일내에 밀봉된 볼륨내에서 다른 2디멘죤에 걸쳐서 일정한 값을 가지며 제 2 코일의 외부 볼륨에서 제로값을 가지는 자계를 상호 제공하는 것을 특징으로 하는 코일 시스템.
  6. 제 5 항에 있어서,
    상기 축길이 (Z0)가 축길이(Zi)보다 큰것을 특징으로 하는 코일 시스템.
  7. 제 6 항에 있어서,
    상기 제 1 및 제 2 코일은 제 1 및 제 2 인쇄회로 기판상에 엣칭된 권선을 포함하며, 상기 각 인쇄회로 기판은 상기 원통을 형성하도록 휘어진 것을 특징으로 하는 코일 시스템.
  8. 제 5 항에 있어서,
    상기 코일이 직렬로 접속된 것을 특징으로 하는 코일 시스템.
  9. 자계를 발생시키는 코일 시스템이,
    제 1 스트림 함수의 도함수와 동일한 내부 표면 전류 분배를 제공하도록 반경(ri)과 축길이(2, Zi)를 가지며 전류원내 접속된 내부 코일을 포함하며, 상기 제 1 스트림 함수는 Z가 -Z1에서 +Zi까지 변하는 측좌표이고, θ가 0에서 2π까지 변에는 주변 좌표일대 변수 Z와 θ에 의해 한정되며, 상기 제1스트림 함수는 n이 1에서 예정된 수 N까지의 전체 수일때, 복수의 계수 An을 포함하며 상기 제1스트림 함수는 다음의 방정식에 의해 정의되고 :
    S1(z,θ)=
    상기 내부 코일과 동축인 전류원에 접속되고 -Z0에서 +Z0까지 Z가 변하는 제 2 스트림 함수와 동일한 외부 표면 전류 분배를 제공하도록 반경(Y0)과 축길이 (2,Z0)를 가지는 외부 코일을 포함하며, 상기 제 2 스트림 함수는 m이 1에서 예정된 수 M까지의 전체 수일때 복수의 계수 Bm을 포함하고, 상기 제 2 스트림 함수는
    S(π,θ)=
    에 의해 정의되고 ;
    상기 내부 및 외부 표면 전류 분배는 예정된 디멘죤에서 경도를 가지고 상기 내부 코일에 의해 밀봉된 볼륨내에서 다른 2디멘죤에 걸쳐서 일정한 값을 가지며, 상기 외부 코일의 외측 볼륨에서 제로값을 가지는 자계를 발생하도록 적용되고, 상기 계수는 상기 자계의 경도와 발생된 경도 사이의 차의 제곱의 합을 예정된 한계내에서 최소화하는 값을 가지는 것을 특징으로 하는 코일 시스템.
  10. 제 9 항에 있어서,
    상기 내부 및 외부 코일은 제 1 및 제 2 인쇄회로 기판상에 엣칭된 권선을 포함하며, 상기 각 제 1 및 제 2 인쇄회로 기판은 원통을 형성하기 위하여 휘어진 것을 특징으로 하는 코일 시스템.
  11. 주자석의 내부의 영상 볼륨에서 균일한 자계를 형성하는 주자석과 ;
    상기 영상 볼륨에서 핵의 핵자기 공명을 자극하도록 전자기 에너지로 상기 영상 볼륨을 파동시키는 무선 주파수 수단과 ;
    상기 영상 볼륨에서 핵의 핵자기 공명을 감지하는 검출수단과 :
    상기 주자석의 균일한 자계내에 위치한 제 1 경도 코일 셋트를 포함하며, 상기 제 1 코일 셋트는 내부 및 외부 코일로 이루어지고, 상기 내부 코일은 반경(ri)과 축길이(Zi)를 가지는 제 1 원통의 표면상에 제 1 표면 전류 분배를 제공하도록 전류원에 접속되고, 상기 외부 코일은 반경이 ri보다 더 큰 rO를 가지며 축길이 (ZO)를 가지며 상기 제 1 원통과 동축인 제 2 원통의 표면상에 제 2 표면 전류 분배를 제공하도록 전류원에 접속되며, 상기 제 1 및 제 2 전류는 제 1 코일 셋트의 외부에서 제로값을 가지며 제 1 코일 셋트의 내부에서 다른 2개의 디멘죤에 걸쳐서 일정한 값을 가지며 제 1 디멘죤에서 경도를 가지는 자계를 발생시키도록 적용되는 것을 특징으로 하는 자기 공명 시스템.
  12. 제 11 항에 있어서,
    각 코일 셋트에서 제로값을 가지며 각 코일 셋트의 나머지 2개의 디멘죤에서 경도를 가지는 자계를 형성하도록 제 2 및 제 3경도 코일 셋트를 포함하는 것을 특징으로 하는 자기 공명 시스템.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019870000914A 1986-02-06 1987-02-05 핵자기 공명 영상용 차폐 경도 코일 Expired KR900000844B1 (ko)

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Application Number Priority Date Filing Date Title
US826.650 1986-02-06
US06/826,650 US4737716A (en) 1986-02-06 1986-02-06 Self-shielded gradient coils for nuclear magnetic resonance imaging
US826,650 1986-02-06

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KR870007686A true KR870007686A (ko) 1987-09-21
KR900000844B1 KR900000844B1 (ko) 1990-02-17

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US (1) US4737716A (ko)
EP (2) EP0231879B1 (ko)
JP (1) JPH07114765B2 (ko)
KR (1) KR900000844B1 (ko)
DE (1) DE3752332T2 (ko)
FI (1) FI95624C (ko)
IL (1) IL80813A (ko)

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FI95624B (fi) 1995-11-15
FI95624C (fi) 1996-02-26
FI870009A0 (fi) 1987-01-02
DE3752332T2 (de) 2002-04-18
US4737716A (en) 1988-04-12
US4737716B1 (ko) 1989-01-24
EP0231879A3 (en) 1987-10-21
EP0231879A2 (en) 1987-08-12
EP0749017A1 (en) 1996-12-18
EP0231879B1 (en) 2001-05-30
KR900000844B1 (ko) 1990-02-17
JPH07114765B2 (ja) 1995-12-13
DE3752332D1 (de) 2001-07-05
JPS62194842A (ja) 1987-08-27
FI870009L (fi) 1987-08-07
IL80813A0 (en) 1987-02-27
IL80813A (en) 1991-11-21

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