DE1813205A1 - Device to avoid susceptibility inhomogeneities in the area of a sample - Google Patents

Device to avoid susceptibility inhomogeneities in the area of a sample

Info

Publication number
DE1813205A1
DE1813205A1 DE19681813205 DE1813205A DE1813205A1 DE 1813205 A1 DE1813205 A1 DE 1813205A1 DE 19681813205 DE19681813205 DE 19681813205 DE 1813205 A DE1813205 A DE 1813205A DE 1813205 A1 DE1813205 A1 DE 1813205A1
Authority
DE
Germany
Prior art keywords
sample
coil
area
inhomogeneities
turns
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE19681813205
Other languages
German (de)
Other versions
DE1813205B2 (en
Inventor
Schulz Dr Gustav
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19681813205 priority Critical patent/DE1813205B2/en
Priority to NL6917943A priority patent/NL6917943A/xx
Priority to LU59945D priority patent/LU59945A1/xx
Priority to BE742715D priority patent/BE742715A/xx
Priority to FR6942126A priority patent/FR2025546A1/fr
Publication of DE1813205A1 publication Critical patent/DE1813205A1/en
Publication of DE1813205B2 publication Critical patent/DE1813205B2/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
    • G01R33/3815—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets with superconducting coils, e.g. power supply therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
    • 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
    • G01R33/30—Sample handling arrangements, e.g. sample cells, spinning mechanisms
    • 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
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils
    • G01R33/34053—Solenoid coils; Toroidal 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
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/34092—RF coils specially adapted for NMR spectrometers
    • 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
    • G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets

Description

In der hochauflösenden Kernreconanz-Spektroskopie werdenIn high-resolution nuclear reconciliation spectroscopy

—R—R

LIagnetfeider von einer Homogenität von 10 über ein Volumen von einigen Zehntel cn benötigt. Von ausschlaggebender Bedeutung ist, daß das von Hagnetcn, der ein honogenes Ilagnetfeld erzeugt, und den erforderlichen Gradicntenspulen erzeugte PeId nicht durch die in Probenkopf angeordneten Teile gestört wird,. Dazu ist z. B. eine sorgfältige Auswahl des in Probenkopf verwendeten Materials im Hinblick auf seine magnetische Suszeptibilität notwendig. Bei Anwendung der in der Hochaufladung üblichen Probenrotation bleiben die peldgradienten in dichtung der Drehachse von besonderer Bedeutung, während Störungen der Feldgradientcnkomponenten in der kbc-ne senkrecht zur Drehachse herausgenittelt werden. Un die 7/irkungcn des Materials in nächster liähe der Probe zu diesen Feldgradienten εο klein wie nöglich zu halten, ist es notwendig, in Richtung der Drehachse Änderungen des LIaterials zu verneiden.Magnet fields of a homogeneity of 10 over a volume needed by a few tenths of a cn. It is of decisive importance that Hagnetcn's, which is a homogeneous Ilagnetfeld generated, and generated the required Gradicntenspulen PeId is not disturbed by the parts arranged in the probe head. For this purpose z. B. careful selection of the material used in the probe head in view of its magnetic susceptibility. When using the the usual sample rotation in high charging remains the Field gradients in the seal of the axis of rotation are of particular importance, while disturbances of the field gradient components in the kbc-ne can be centered perpendicular to the axis of rotation. And the effects of the material in the immediate vicinity of the sample to keep these field gradients εο small as possible, it is necessary to avoid changes to the material in the direction of the axis of rotation.

Bei einer Einspulenanordnung bedeutet eine besonders schwerwiegende L'aterialinhomogenität in Richtung der Drehachse die für den Nachweis des Kernr.agnetisr.us notwendige Hochfrequenzspule, die, un einen guten Püllfaktor zu erzielen, die Probe möglichst nahe umschließen muß, und die, un hohe Spulengüte zu erhalten, aus einigen Windungen nicht zu dünnen Kupferdrahtes besteht. Auch bei Verwendung von extren reinen eisenfreien Kupferdraht bleiben gerade in.nächster Nähe der Probe Suszeptibilitätsdifferenzen zwischen der Hochfrequenzspule und der sie umgebenden Luft oder zwischenIn the case of a single-coil arrangement, a particularly serious one means L'material inhomogeneity in the direction of the axis of rotation the high-frequency coil necessary for the detection of the Kernr.agnetisr.us, which, in order to achieve a good flushing factor, must enclose the sample as closely as possible, and which, in order to achieve a high level To obtain coil quality, consists of a few turns of copper wire that is not too thin. Even when using extremes pure iron-free copper wire just stay in close proximity to the sample susceptibility differences between the RF coil and the air surrounding it or between

PA 9/522/59, Gl/BzPA 9/522/59, Gl / Bz

09824/1IO309824 / 1IO3

der Hochfrequenzspule und den diamagnetischen Uaterial, auf das die Hochfrequenzspule aus Gründen mechanischer Stabilität aufgewunden ist, bestehen.the high frequency coil and the diamagnetic Umaterial, on the the high frequency coil for reasons of mechanical Stability is wound up, exist.

Die Erfindung löst diese an die Llaterialhonogenitat gestellte Aufgabe. Sie sieht eine Einrichtung zur Vermeidung von Suszcptibilitäteinhonogenitäten in Bereich einer auf Kernnagneticnus zu untersuchenden Probe, die von einen ein hochfrequentes Ilagnetfeld in der Probe erzeugenden Spulenkörper umgeben ist, vor. Sie ist dadurch gekennzeichnet, daß die Anzahl der Windungen an beiden ITndcn des von elektrischen Strom durchflossenen Teiles des Spulenkörpers parallel zur Achsenrichtung in den Spulenkörper verlängernder V/eise erhöht ist. In einer Weiterbildung der Erfindung können die toten Windungen des Spulenkörper s, d. h..die '("'indungen außerhalb des strondurchflossenen Teiles, zur Vermeidung der Erzeugung von störenden vYirbelstrcmen parallel zur Achsenrichtung schlitzbar sein.The invention solves this problem of material homogeneity Task. She sees a device for avoiding susceptibility inhonogeneities in the area of a on nuclear magnetic specimen to be examined, which is from a a high-frequency Ilagnetfeld is surrounded in the sample generating coil form, before. It is characterized by that the number of turns on both ITndcn of the part of the through which electrical current flows Coil body parallel to the axial direction in the coil body extending V / iron is increased. In a further education of the invention, the dead turns of the bobbin s, d. h..the '("' indungen outside the current-carrying Part can be slit parallel to the axis direction to avoid the generation of disruptive vortex currents be.

Die Erfindung wird anhand eines Ausführungsbeispiels mittels der Pigur im folgenden näher erläutert.The invention is explained in more detail below on the basis of an exemplary embodiment by means of the Pigur.

Zwischen den beiden Folschuhcn P 1 und P 2, z. B. eines Permanentnag2ieten, ist eine Einrichtung 3 für die Ilessung des Magnetfeldes, welches von Elektroncncpins und/oder Kernspins einer Probe erzeugt wird, angeordnet. Die zur Erstellung einer Homogenität des homogenen I.Iagnetfeldes zwischen den Polschuhen P 1 und P 2 notwendigen Peldgradicntenspulcn sind nicht eingezeichnet. Sichtbar ist ein Probenröhrchen R 1, z. 3. aus Quarzglas, in welchem sich eine Flüssigkeit F befindet. Dieses Röhrchen R 1 kann mittels einer nicht näher dargestellten Vorrichtung un die Drehachse G rotiert werden. Um einen kleinen Bereich (ca. einige Zehntel cn"') der Flüssigkeit F in Probenröhrchen R 1 ist eine Hochfrequenzspule II? mit drei Windungen undBetween the two Folschuhcn P 1 and P 2, z. B. permanent riveting, a device 3 for the measurement of the magnetic field, which is generated by electron pins and / or nuclear spins of a sample, is arranged. The field gradient coils necessary for creating a homogeneity of the homogeneous magnetic field between the pole pieces P 1 and P 2 are not shown. A sample tube R 1 is visible, e.g. 3. Made of quartz glass, in which a liquid F is located. This tube R 1 can be rotated un the axis of rotation G by means of a device not shown in detail. Around a small area (about a few tenths cn "') of the liquid F in the sample tube R 1 is a high-frequency coil II? With three turns and

^ 9/522/59 OO9824/1103 BAD0RiöJN^" ^ 9/522/59 OO9824 / 1103 BAD0RiöJN ^ "

den Anschlüssen Λ 1 und Λ 2 für die hochfrequente Stromzuführung angeordnet. Diese Hochfrequenzspule KP kann aus Gründen der mechanischen Stabilität selbst auf ein weiteres Quarzglaeröhrchen R 2 aufgewunden sein. Der Spulenklrpc-r, d. h. die drei ".'.'indungen der Hochfrequenzspule H?, ist in Richtung der Drehachse C an "beiden Und en des Spulenkürpers selbst un einige Windungen verlängert. Diese zusätzlichen ''«'indungen, nie aus der. gleichen eisenfreien Kupferdroht wie die Hochfrequenzspule II? bestehen, dienen dazu, da5 irgendwelche Suszeptibiiitlltsdifferenzen, die bein Übergang der !'afnetfeldlinien von den Windungen zu den sie urgebcnden Ilaterial, hier z. 3. Quarzglas des r.chrchens ?. 2, sich ergeben, aus den Bereich des ne2v;irkcanen Probcnvolunens der Flüssigkeit 7 herausgeschoben werden.the connections Λ 1 and Λ 2 for the high-frequency power supply. This high-frequency coil KP can itself be wound onto another quartz glass tube R 2 for reasons of mechanical stability. The coil body, that is to say the three "." These additional '''' indications, never from the. same iron-free copper threat as the high-frequency coil II? exist, serve to prevent any susceptibility differences that occur at the transition of the surface field lines from the windings to the original material, here e.g. 3. Quartz glass of the little church?. 2, result, are pushed out of the area of the neural sample volume of the liquid 7 .

Beim lurchfluß von hochfrequenten Strom durch die Hochfrequenzspule HF bzv.·. durch den Cpulenkürper S, können in den toten, Windungen, d. h. ucr. nicht von 5trcr. dur ·Ιι-flosscncn Windungen des CpulcnLCrpcrs ^, 'VirbelstrUnc induziert werden. Diese V."ir"belstri.'ne wurden ein zusätzliches und stl'renäes- Magnetfeld erzeugen. Zur Verneidung dieser Störungen sind diece toten Windungen lungs der Drehachsenrichtung G sehlitzbar.When high-frequency current flows through the high-frequency coil HF or ·. through the Cpulenkürper S, can in the dead, coils, d. H. ucr. not from 5trcr. dur · Ιι-flosscncn Convolutions of the CpulcnLCrpcrs ^, 'VirbelstrUnc be induced. These V. "ir" belstri.'ne became an additional one and generate stl'renäes magnetic field. To avoid it of these faults, the dead turns in the direction of the axis of rotation G can be seated.

2 Patentansprüche 1 Figur2 claims 1 figure

ΡΛ9/52Ϊ/59'ν■-■ 009824/1103ΡΛ9 / 52Ϊ / 59'ν ■ - ■ 009824/1103

Claims (2)

P a t e η t a η s ρ r ti eheP a t e η t a η s ρ r ti ehe 1. Einrichtung1. Establishment gcnitUten in Eereich einer auf Kernnagneti£inu8 zu untersuchenden Probe, die vcn einen ein hochfrequentes Magnetfeld-in der Probe erzeugenden Spulenkörper ungeben ist, dadurch gekennzeichnet, daß die Anzahl der. Windungen εη beiden Enden des von elektrischen Stron durchfloEsenen Teiles des SpulenkUrpers (S) parallel zur Achrenrichtung (C) inden Spulenkörper (G) verlängernder ,Weise erhöht ist,Connections in a region to be examined for nuclear magnetism Sample that is exposed by a coil former that generates a high-frequency magnetic field in the sample is, characterized in that the number of. Turns εη both ends of the electric current flow through part of the coil body (S) parallel to the Achren direction (C) in the coil body (G) , Way is exalted, 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die toten Windungen des Spulenkörperß (S) zur Verneidung der Erzeugung von störenden Wirbelströßen parallel zur 3)rehachsenrichtung (C) 3chlitzbar sind»2. Device according to claim 1, characterized in that that the dead turns of the bobbin (S) to avoid the generation of disturbing eddy currents parallel to the 3) reel axis direction (C) 3 are slitable » ΡΛ 9/522/59 00,98 24/1103ΡΛ 9/522/59 00.98 24/1103
DE19681813205 1968-12-06 1968-12-06 High frequency coil for induction of nucleus or electron resonance Pending DE1813205B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE19681813205 DE1813205B2 (en) 1968-12-06 1968-12-06 High frequency coil for induction of nucleus or electron resonance
NL6917943A NL6917943A (en) 1968-12-06 1969-11-28
LU59945D LU59945A1 (en) 1968-12-06 1969-12-04
BE742715D BE742715A (en) 1968-12-06 1969-12-05
FR6942126A FR2025546A1 (en) 1968-12-06 1969-12-05

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681813205 DE1813205B2 (en) 1968-12-06 1968-12-06 High frequency coil for induction of nucleus or electron resonance

Publications (2)

Publication Number Publication Date
DE1813205A1 true DE1813205A1 (en) 1970-06-11
DE1813205B2 DE1813205B2 (en) 1971-02-04

Family

ID=5715511

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19681813205 Pending DE1813205B2 (en) 1968-12-06 1968-12-06 High frequency coil for induction of nucleus or electron resonance

Country Status (5)

Country Link
BE (1) BE742715A (en)
DE (1) DE1813205B2 (en)
FR (1) FR2025546A1 (en)
LU (1) LU59945A1 (en)
NL (1) NL6917943A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738897A1 (en) * 1995-03-25 1996-10-23 Spectrospin AG HF reception coils device for NMR spectrometer
US5581186A (en) * 1994-03-11 1996-12-03 Bruker Analytische Messtechnik Gmbh Bird cage resonator for high resolution nuclear magnetic resonance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI73320C (en) * 1984-01-20 1987-09-10 Instrumentarium Oy NMR SPOLARRANGEMANG.
DE4018657A1 (en) * 1990-06-11 1991-12-12 Bruker Analytische Messtechnik SAMPLE HEAD FOR NUCLEAR RESONANCE SPECTROMETER

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5581186A (en) * 1994-03-11 1996-12-03 Bruker Analytische Messtechnik Gmbh Bird cage resonator for high resolution nuclear magnetic resonance
EP0738897A1 (en) * 1995-03-25 1996-10-23 Spectrospin AG HF reception coils device for NMR spectrometer
US5689187A (en) * 1995-03-25 1997-11-18 Spectrospin Ag RF receiver coil configuration for an NMR spectrometer

Also Published As

Publication number Publication date
FR2025546A1 (en) 1970-09-11
DE1813205B2 (en) 1971-02-04
NL6917943A (en) 1970-06-09
BE742715A (en) 1970-06-05
LU59945A1 (en) 1970-02-04

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