摘要:
An instrument 14 e.g. needle or stent, for use in a magnetic resonance imaging (MRI) or computed tomography (CT) procedure. The instrument 14 comprising an anode 24 and a cathode 26, wherein, in use, current flows between the anode 24 and cathode 26, thereby producing a plurality of bubbles (not shown). The bubbles are detectable by the MRI or CT so the therefore the instrument can be detected. The power source can be integral with the instrument or electrically connected via wires.
摘要:
An MRI-guided medical device includes an elongated sheath, an elongated dilator, and an elongated needle. The sheath has a distal end, an opposite proximal end, and a central lumen extending between the proximal and distal ends. The sheath comprises MRI-compatible material and includes a tracking member located adjacent to the sheath distal end that is visible in an MRI image. The dilator comprises MRI-compatible material and is movably disposed within the sheath lumen. A distal end of the dilator is configured to extend outwardly from the sheath distal end and dilator includes at least one tracking member that is visible in an MRI image. The needle is movably disposed within the dilator lumen and is movable between stored and operative positions relative to the dilator. An RF shield may be coaxially disposed within the elongated sheath so as to surround a portion of the sheath central lumen.
摘要:
Verfahren zur Ermittlung von zweidimensionalen Bilddaten wenigstens einer Schnittfläche (5) eines Erfassungsvolumens, im Rahmen einer Magnetresonanzbildgebung durch eine kombinierte Magnetresonanz- und Röntgenvorrichtung (9), die eine Magnetresonanzeinrichtung und eine Röntgeneinrichtung umfasst, deren zur Bildgebung genutzte Koordinatensysteme durch eine mechanische Kopplung der Röntgeneinrichtung mit der Magnetresonanzeinrichtung zueinander registriert sind, umfassend die durch eine Steuereinrichtung (12) durchgeführten Schritte: - Ansteuern der Röntgeneinrichtung zum Erfassen wenigstens eines Röntgenbilds (1), das ein Objekt (2), insbesondere ein medizinisches Instrument, zumindest teilweise abbildet, - Ermitteln wenigstens einer Objektinformation, die eine Position und/oder eine Ausrichtung und/oder wenigstens ein Merkmal des Objekts (2) betrifft, durch eine Bildverarbeitung des Röntgenbilds (1), - Ermitteln wenigstens eines Schnittflächenparameters, der eine Anordnung der Schnittfläche (5) in dem Erfassungsvolumen vorgibt, in Abhängigkeit der Objektinformation, - Ansteuern der Magnetresonanzeinrichtung zur Erfassung von die Schnittfläche (5) betreffenden Messdaten, und - Berechnen der zweidimensionalen Bilddaten aus den Messdaten, wobei das Ansteuern der Magnetresonanzeinrichtung und/oder die Berechnung der zweidimensionalen Bilddaten in Abhängigkeit des Schnittflächenparameters erfolgt.
摘要:
An actively tracked medical device comprising: a dilator having an inner tubular main body having a distal end and a proximal end, said tubular main body including at least first and second receiving channels positioned in a spaced apart relationship on an outer surface of said tubular main body; a region at the distal end of said tubular main body for supporting one or more tracking coils; an atrumatic tip portion operably coupled and positioned distal to said main body; a lumen extending through said tubular main body, said tip support and said atraumatic tip portion; and an outer polymer body having first and second ends, said outer polymer body operably covering said inner tubular main body and said tracking coils, said first end terminating adjacent a proximal end of said atraumatic tip portion and said second end terminating adjacent said hub.
摘要:
The present invention generally relates to a composition comprising acetic anhydride, a DNP agent and a gadolinium complex and its use for the preparation of hyperpolarised imaging agent for MR diagnostic analysis.
摘要:
A needle placement manipulator includes, a pair of rotary guides arranged at a slanted angle with respect to each other, a needle holder which holds a needle along a needle holder axis, and a base body on which the guides are supported. The needle holder axis and each axis of the rotary guides cross at a single point located at or below the base body. The base body is configured to be attached to a patient or to an RF-coil.
摘要:
An MRI-guided medical device includes an elongated sheath, an elongated dilator, and an elongated needle. The sheath has a distal end, an opposite proximal end, and a central lumen extending between the proximal and distal ends. The sheath comprises MRI-compatible material and includes a tracking member located adjacent to the sheath distal end that is visible in an MRI image. The dilator comprises MRI-compatible material and is movably disposed within the sheath lumen. A distal end of the dilator is configured to extend outwardly from the sheath distal end and dilator includes at least one tracking member that is visible in an MRI image. The needle is movably disposed within the dilator lumen and is movable between stored and operative positions relative to the dilator. An RF shield may be coaxially disposed within the elongated sheath so as to surround a portion of the sheath central lumen.
摘要:
The invention relates to a preparing apparatus for preparing an influencing procedure for influencing a subject. The preparing apparatus (1) comprises a subject coil (3) for generating a magnetic resonance image of he subject (7), an instrument guide device (5) for guiding an instrument (6) for influencing the subject (7), a marker (9) being visible in the magnetic resonance image, and an attaching element for attaching the instrument guide device (5) to the subject coil (3) in a known spatial relationship. Since the spatial relationship between the instrument guide device (5) and the subject coil (3) is known, if they are attached to each other, a time consuming registration procedure for registering an influence trajectory, which has been planned based on the magnetic resonance image, and the instrument guide device (5) can be avoided.
摘要:
An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface (161) associated with the implanted lead or the leadwire, a diversion or diverter circuit (112') associated with the energy dissipating surface (161), and at least one non-linear circuit element switch (284, 284', 284'') for diverting energy in the implanted lead or the leadwire through the diversion circuit (112') to the energy dissipating surface. In alternate configurations, the switch may be disposed between the implanted lead or the leadwire and the diversion circuit, or disposed so that it electrically opens the implanted lead or the leadwire when diverting energy through the diversion circuit to the energy dissipating surface. The non-linear circuit element switch is typically a PIN diode. The diversion circuit may be either a high pass filter or a low pass filter.
摘要:
Die Erfindung betrifft eine Vorrichtung zur Erzeugung von Gegenfeldern zur Abschirmung eines Implantats im Körper einer Person bei einer magnetresonanztomographischen Aufnahme, welche eine Felderzeugungseinrichtung mit einem oder mehreren Felderzeugungsmitteln zum Erzeugen von Feldpulsen und eine mit der Felderzeugungseinrichtung gekoppelte Steuereinrichtung umfasst und so ausgebildet ist, dass Feldpulse als Gegenfelder erzeugbar sind, durch welche bei der magnetresonanztomographischen Aufnahme eingesetzte hochfrequente, elektromagnetische Feldpulse und/oder magnetische Gradientenfeldpulse in einer das Implantat zumindest abschnittsweise enthaltenden räumlichen Zone durch Superposition in ihrer Intensität verringer- oder auslöschbar sind. Sie betrifft des Weiteren ein Verfahren zum Betreiben eines Magnetresonanztomographen, bei welchem Feldpulse als Gegenfelder erzeugt werden, durch die bei einer magnetresonanztomographischen Aufnahme eingesetzte hochfrequente, elektromagnetische Feldpulse und/oder magnetische Gradientenfeldpulse in einer ein Implantat im Körper einer Person zumindest abschnittsweise enthaltenden räumlichen Zone durch Superposition in ihrer Intensität verringer- oder auslöschbar sind.