WO1994020861A1 - Probenkopf für kernspinresonanzsysteme - Google Patents
Probenkopf für kernspinresonanzsysteme Download PDFInfo
- Publication number
- WO1994020861A1 WO1994020861A1 PCT/DE1994/000279 DE9400279W WO9420861A1 WO 1994020861 A1 WO1994020861 A1 WO 1994020861A1 DE 9400279 W DE9400279 W DE 9400279W WO 9420861 A1 WO9420861 A1 WO 9420861A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sample head
- coil
- head according
- magnetic field
- sample
- Prior art date
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
-
- 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
-
- 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
Definitions
- the invention relates to a specially configured probe head for magnetic resonance systems according to the preamble of claim 1.
- the technical field of application of this probe head is nuclear magnetic resonance systems, which are used for analytical as well as for medical applications with high frequency (HF) probes for generating a magnetic high frequency field but also for receiving corresponding high frequency signals, especially for exchangeable HF antennas for adaptation various measurement problems can be used.
- HF high frequency
- Conventional RF probes (probe heads) for use in nuclear magnetic resonance systems usually consist of one or more antennas (RF coils) for generating or detecting a high-frequency magnetic field and a coupling circuit for optimal adaptation to the impedance of the high-frequency Transmitter or receiver of usually 50 ⁇ .
- Feed lines between the RF coil and the coupling circuit cause so-called "inductive losses", ie ineffective portions of magnetic RF field components. These losses reduce the reception sensitivity or the generated transmission field strength, ie the efficiency of the probe head.
- a reduced probe head efficiency results in an increased transmission power requirement to achieve the required field strength and a reduced signal / noise ratio. This means that the information content of the measurement is reduced or a significant increase in the measurement time has to be accepted.
- a probe head for nuclear magnetic resonance systems for generating and detecting magnetic high-frequency fields with a frame which has a coupling network and a module-like, implementable RF coil arrangement (insert), is specified such that the RF coil arrangement implemented in the frame is arranged in such a way for the coupling network, that the inductive losses are minimal.
- the invention is based on the idea that, relative to the coupling network fixed to the probe head, a recording area is provided, into which an RF coil arrangement is introduced in a module-like manner, which is preferably itself accommodated in a unit module.
- the distance between the center of the RF coil which is contained in the RF coil arrangement and the coupling network is due to the spatial arrangement of the RF coil. relative to the unit module and thus relative to the receiving area provided in the frame.
- the RF coil arrangement can also have a plurality of RF coils which can be integrated as a unit module in the sample head.
- the highly precise alignment of the pore head and thus the position of the RF coil relative to the center of the magnetic field required for the magnetic resonance examinations plays a role in the increase the efficiency of such systems play an important role.
- the mechanical adjustability of the device for positioning the sample head must be designed in such a way that at least one change in position of the sample head in the axial direction of the magnet is ensured.
- the device for positioning the sample head can also be designed such that it can be adjusted in several degrees of freedom.
- the height of the sample head is adjusted in the axial direction of the magnet in accordance with the design or installation of the magnet.
- the sample head is geometrically in the z direction, i.e. the axial direction of the magnet, dimensioned with such a length extension that - with an optimal distance between the coupling network and the RF coil - even the smallest RF coil can still be placed in the center of the magnet.
- a more elegant embodiment is a device for position adjustment, which can lock the probe head in various discrete positions along the z-axis and thus in the axial direction of the magnet via a bayonet-type adjustment mechanism. In practice, this finite number of adjustment options is sufficient for an exact alignment of the sample head relative to the center of the magnetic field.
- the appropriate positioning can also be selected using an automatic control.
- an automatic presetting of insert-specific device parameters can also be provided by coding the inserts, e.g. the range of the resonance frequency, a limitation of the maximum RF or gradient power as well as correction values for the homogenization of the static magnetic field or for the compensation of eddy current effects.
- the distance between the RF coil and the coupling circuit can be optimally predetermined and the inductive losses can thus be minimized.
- the optimum efficiency can be achieved in this way after an exact alignment of the RF coil with the magnetic field.
- sample heads is possible, which the use of individual allow RF coils optimized for the measuring tasks without impairing the efficiency of the overall arrangement. This eliminates the need to use a separate, expensive probe head for optimal results.
- 1 is a schematic representation of the position adjustment of the sample head using interchangeable spacers
- Fig. 2 shows a device for position adjustment by means of a bayonet-type adjustment mechanism.
- FIG axial direction of the magnet is provided, as is sufficient for most applications.
- the probe head is to be dimensioned mechanically so long that even the smallest RF coil can still be transported to the center of the magnet.
- a cylindrical magnet arrangement 4 is shown in the left partial illustration in FIG. 1, the magnetic field center of which is designated 4.1.
- Two embodiments of the sample head according to the invention are shown to the right of the magnet arrangement.
- the sample head 1 each has an RF coil 2, which has a diameter of 2 mm in the central embodiment 1.1 and a diameter of 25 mm in the left embodiment 1.2.
- Both RF coils 2 are arranged in the associated probe heads so that optimal operating parameters of the magnetic resonance system are achieved.
- the mechanical adjustment of the position of the entire sample head within the magnetic field takes place in this embodiment by attaching the sample head 1 by means of spacers 5 of different thicknesses.
- the placement of the larger RF coil 2 with the diameter of 25 mm according to FIG. 1.2 in the magnetic center 4.1 requires a less intense immersion of the sample head 1 in the magnet, which is achieved by a correspondingly dimensioned spacer 5.
- Surface coils are also included, in which the measuring range is located in the magnetic center, but the coil is outside the magnetic center.
- FIG. 2 illustrates the basic illustration of a device for vertical position adjustment of the sample head by means of a bayonet-type adjustment mechanism.
- the spectrum of the HF coils 2 that can be used in this device is limited in the same way as in the first exemplary embodiment according to FIG. 1 by the coils with the diameter specifications 2 mm and 25 mm.
- the coils are arranged at the level of the magnetic center 4.1. This arrangement is ensured by adjusting the height of the probe 1 by means of bayonet catch 6.
- the bayonet catch allows height adjustment in discrete steps.
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94911051A EP0688435A1 (de) | 1993-03-08 | 1994-03-08 | Probenkopf für kernspinresonanzsysteme |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4307227 | 1993-03-08 | ||
DEP4307227.5 | 1993-03-08 | ||
DEP4404647.2 | 1994-02-14 | ||
DE4404647A DE4404647A1 (de) | 1993-03-08 | 1994-02-14 | Probenkopf für Kernspinresonanzsysteme |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994020861A1 true WO1994020861A1 (de) | 1994-09-15 |
Family
ID=25923730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1994/000279 WO1994020861A1 (de) | 1993-03-08 | 1994-03-08 | Probenkopf für kernspinresonanzsysteme |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0688435A1 (de) |
WO (1) | WO1994020861A1 (de) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4727328A (en) * | 1985-11-15 | 1988-02-23 | Technicare Corporation | Patient handling arrangements for NMR imaging systems |
US4733190A (en) * | 1987-03-16 | 1988-03-22 | Medical Advances, Inc. | NMR local coil with adjustable spacing |
US4793356A (en) * | 1985-08-14 | 1988-12-27 | Picker International, Inc. | Surface coil system for magnetic resonance imaging |
WO1990013045A1 (en) * | 1989-04-21 | 1990-11-01 | Webb Research Ii, Inc. | Variable position surface coil stabilizer for magnetic resonance imaging |
DE4020477A1 (de) * | 1989-06-28 | 1991-01-10 | Siemens Asahi Medical Systems | Hf-spulen-positioniervorrichtung fuer eine bildgebende mr-anlage |
US5143068A (en) * | 1990-11-26 | 1992-09-01 | Resonex, Inc. | Flexible and curved radio frequency (RF) coil for the human shoulder for magnetic resonance imaging apparatus |
EP0532966A1 (de) * | 1991-09-16 | 1993-03-24 | Bruker Instruments, Inc. | Verbesserte Sonde zur Bilderzeugung von kleinen Proben mittels magnetischer Kernresonanz |
US5197474A (en) * | 1990-06-14 | 1993-03-30 | Instrumentarium Corp. | Patient bed in a magnetic resonance imaging apparatus |
-
1994
- 1994-03-08 EP EP94911051A patent/EP0688435A1/de not_active Ceased
- 1994-03-08 WO PCT/DE1994/000279 patent/WO1994020861A1/de not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4793356A (en) * | 1985-08-14 | 1988-12-27 | Picker International, Inc. | Surface coil system for magnetic resonance imaging |
US4727328A (en) * | 1985-11-15 | 1988-02-23 | Technicare Corporation | Patient handling arrangements for NMR imaging systems |
US4733190A (en) * | 1987-03-16 | 1988-03-22 | Medical Advances, Inc. | NMR local coil with adjustable spacing |
WO1990013045A1 (en) * | 1989-04-21 | 1990-11-01 | Webb Research Ii, Inc. | Variable position surface coil stabilizer for magnetic resonance imaging |
DE4020477A1 (de) * | 1989-06-28 | 1991-01-10 | Siemens Asahi Medical Systems | Hf-spulen-positioniervorrichtung fuer eine bildgebende mr-anlage |
US5197474A (en) * | 1990-06-14 | 1993-03-30 | Instrumentarium Corp. | Patient bed in a magnetic resonance imaging apparatus |
US5143068A (en) * | 1990-11-26 | 1992-09-01 | Resonex, Inc. | Flexible and curved radio frequency (RF) coil for the human shoulder for magnetic resonance imaging apparatus |
EP0532966A1 (de) * | 1991-09-16 | 1993-03-24 | Bruker Instruments, Inc. | Verbesserte Sonde zur Bilderzeugung von kleinen Proben mittels magnetischer Kernresonanz |
Non-Patent Citations (2)
Title |
---|
P. RÖSCHMANN ET AL.: "DIE BEDEUTUNG DER HF-SPULEN FÜR DIE KERNSPINTOMOGRAPHIE", BIOMEDIZINISCHE TECHNIK, vol. 31, no. 7/8, 1 July 1986 (1986-07-01), BERLIN DE, pages 178 - 185 * |
T.L. NAGEL ET AL.: "THE CROSSOVER SURFACE COIL: AN EFFICIENT IN VIVO NMR DETECTOR", MAGNETIC RESONANCE IN MEDICINE., vol. 13, no. 2, 1 February 1990 (1990-02-01), DULUTH,MN US, pages 271 - 278 * |
Also Published As
Publication number | Publication date |
---|---|
EP0688435A1 (de) | 1995-12-27 |
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