Abstract:
According to some aspects, a laminate panel is provided. The laminate panel comprises at least one laminate layer including at least one non-conductive layer and at least one conductive layer patterned to form at least a portion of a B 0 coil configured to contribute to a B 0 field suitable for use in low-field magnetic resonance imaging (MRI).
Abstract:
A shutting assembly for a magnetic resonance imaging device (MRD) bore aperture, comprising at least one first movable portion and at least one second portion affixed to the MRD, wherein the shutting assembly further comprising a normally closed or normally open sliding mechanism. The sliding mechanism couples at least one first moveable portion to at least one second portion affixed to the MRD, thereby enabling a reciprocal movement of at least one first moveable portion parallel to the MRD bore aperture in an upwards and downwards directions in respect to at least one second portion affixed to the MRD.
Abstract:
A system and method for decoupling radio frequency ("RF"} coils arranged in proximity to each other is provided. The decoupling is achieved using a magnetic wall that includes resonators arranged on an electrically insulating substrate. The magnetic wall is placed between the RF coils. When an electromagnetic field produced by one of the RF coils is incident on the magnetic wall, the magnetic wall acts to cancel the incident electromagnetic field by attenuating or redirecting the incident field. The magnetic wall is modular, and an array of such magnetic walls can be used to enclose individual RF coil elements, or sub-arrays of two or more RF coil elements.
Abstract:
The invention provides for a magnetic resonance imaging system (300, 400) for acquiring magnetic resonance data (342). The magnetic resonance imaging system comprises a coil assembly (319) configured for radiating and/or receiving radio frequency energy from an imaging zone. The coil assembly has a first surface (315) configured for being directed towards the imaging zone and comprises at least one coil element (317). The coil assembly further comprises a radio frequency shield (319) switchable between an RF blocking state (804) and an RF transparent state (802). The at least one coil element is between the first surface and the radio frequency shield. The switchable radio frequency shield comprises at least two conductive elements (322). The radio frequency shield comprises at least one radio frequency switch (324) configured for electrically connecting the at least two conductive elements in the blocking state and disconnecting the at least two conductive elements in the transparent state.
Abstract:
A nuclear detector module (24) is housed within an electrically conductive hollow resonator element (18) that is to be used in a combined MR and nuclear imaging unit. The resonator element has an inner face (26) which is radiation transparent facing an examination region (14) and a plurality of other faces (28) disposed facing and spaced from an RF screen (22).
Abstract:
Die Erfindung betrifft eine Sensorvorrichtung für die Messung von feinmotorischen Handfunktionen. Sie ist gekennzeichnet durch einen gegen elektromagnetische Wechselfelder geschirmten Kraftsensor. Dies bewirkt eine freie Bewegbarkeit der Sensorvorrichtung im Magnetresonanztomograph. Durch die Verwendung der erfindungsgemäßen Sensorvorrichtung im Magnetresonanztomograph ist eine Korrelation der mittels der Sensorvorrichtung erhobenen feinmotorischen Handfunktionen mit einem mittels Magnetresonanztomograph erfolgtem Nachweis der an den Handfunktionen beteiligten Hirnareale möglich. Beide Parameter, also feinmotorische Handfunktion und die an der Ausführung der Handfunktionen beteiligten Hirnareale, sind auf diese Weise miteinander korrelierbar.
Abstract:
Eine Sendeantenne für Magnetresonanzanwendungen weist mehrere sich von einem ersten zu einem zweiten Ende (1', 1") erstreckende Antennenstäbe (1) auf. Die Antennenstäbe (1) sind um eine Zentralachse herum verteilt angeordnet. Sie sind an ihren ersten Enden (1') mittels eines ersten und an ihren zweiten Enden (1") mittels eines zweiten Abschlusselements (3, 6) abgeschlossen. Das erste Abschlusselement (3) ist als Endring ausgebildet, der eine Anzahl von Endringabschnitten (4) aufweist, die über Endringkondensatoren (5) miteinander gekoppelt sind. Das zweite Abschlusselement (6) ist anders ausgebildet als das erste Abschlusselement (3). Die Sendeantenne weist eine Verstimmschaltung (7) auf, mittels derer die Sendeantenne verstimmbar ist. Die Verstimmschaltung (7) ist auf Seiten des zweiten Abschlusselements (6) angeordnet.
Abstract:
The vacuum properties of a cryogenic NMR probe maintained at a desired operating temperature by a cold head heat exchanger are improved by a separate heat exchanger operating below the temperature of the cold head heat exchanger for maintaining cryo-pumping surfaces at a temperature below said selected operating temperature.
Abstract:
RF electric fields produced by electric potential differences in the NMR probe coil windings may penetrate the NMR sample and sample tube causing sensitivity loss and increased noise in NMR spectroscopy. Electrically conducting strips in close proximity to the windings of the NMR probe coil and oriented at right angles to direction of the coil winding they cross provide an alternative path for these electric fields while causing negligible effect upon the RF magnetic field, thereby increasing the sensitivity of the NMR probe.