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公开(公告)号：US10788548B2
公开(公告)日：2020-09-29
申请号：US15518533
申请日：2015-10-02
IPC分类号： G01R33/28 , G01R33/385 , G01R33/46 , G01V3/10 , G01N27/72
摘要： The invention provides for a metal detector (100, 300) with at least a first coil (102) for generating a first magnetic field (108) along a first direction (119). The first coil is a split coil with a first (104) and a second (106) portion (104). A coil power supply (110) separately supplying time varying electrical power to the coil portions. At least one electrical sensor (116, 118) measures electrical data (136) descriptive of the electrical power supplied to at least the first coil portion and the second coil portion. The coils are controlled such as to move a field-free region in a predetermined pattern within a measurement zone. If metal is detected, the pattern is modified for refining localisation of the metallic object.
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公开(公告)号：US10274555B2
公开(公告)日：2019-04-30
申请号：US15127859
申请日：2015-02-27
IPC分类号： G01R33/34 , G01R33/3415 , G01R33/36 , G01R33/422
摘要： An RF antenna system (100, 1014, 1014′) transmits RF excitation signals into and/or receives MR signals from an MR imaging system's (1000, 1100, 1200) imaging volume (1015). The magnetic resonance imaging antenna includes a coil former (100, 1014, 1014′) adjacent to the imaging volume (1015); and a resonator (400, 500, 600) attached to the coil former and tuned to at least one resonant frequency formed from electrical connections (304), between multiple capacitors (302). The multiple capacitors are distributed in a periodic pattern (300, 700, 800, 900) about and along the coil former.
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3.发明授权公开(公告)号：US11047940B2
公开(公告)日：2021-06-29
申请号：US16629587
申请日：2018-07-12
IPC分类号： G01R33/385 , G01R33/54 , G01R33/36
摘要： The present invention provides a passive radio frequency (RF) shim resonator (144) for field homogenization of an RF field emitted by an RF antenna device (140) of a magnetic resonance (MR) imaging system (110), whereby the passive RF shim resonator (144) has a first resonating capability and a second resonating capability, and the passive RF shim resonator (144) comprises a switching device, whereby the switching device is adapted to switch between the first and the second resonating capability in accordance with a TX-mode and a RX-mode of the RF field emitted by the RF antenna device (140) of the MR imaging system (110). The present invention further provides a patient bed (142) or a patient mattress for use in a magnetic resonance imaging (MRI) system (110), whereby the patient bed (142) or the patient mattress comprises an above passive RF shim resonator (144). The present invention further provides a RF antenna device for generating and/or receiving a RF field for use in a MRI system (110), whereby the RF antenna device (140) comprises a coil housing and an above passive RF shim resonator (144), wherein the passive RF shim resonator (144) is located within the coil housing. The present invention also provides a magnetic resonance (MR) imaging system (110), comprising an above patient bed (142) or patient mattress or at least one above RF antenna device (140).
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公开(公告)号：US10539636B2
公开(公告)日：2020-01-21
申请号：US15568523
申请日：2016-04-25
发明人： Christian Findeklee
IPC分类号： G01R33/36 , G01R33/561 , G01R33/28
摘要： A multi-channel transmit/receive radio frequency (RF) system for a magnetic resonance examination system with an RF antenna array includes multiple antenna elements and an RF power supply to supply electrical RF power to the antenna elements. Directional couplers are circuited between respective antenna elements and a power distributor. A monitoring module is configured to measure forward electrical wave amplitude(s) and reflected electrical wave amplitude(s) at individual directional couplers. An arithmetic module is configured to compute individual coil element currents on the basis of the measured forward and reflected electrical wave amplitudes.
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公开(公告)号：US10060994B2
公开(公告)日：2018-08-28
申请号：US14439137
申请日：2013-10-23
IPC分类号： G01V3/18 , G06F3/041 , G01R33/34 , G01R33/3415 , G01R33/345 , G01R33/561 , G01R33/565
CPC分类号： G01R33/34076 , G01R33/34046 , G01R33/34092 , G01R33/3415 , G01R33/3453 , G01R33/5612 , G01R33/5659
摘要： A radio frequency (RF) antenna device (140) applies an RF field to an examination space (116) of a magnetic resonance (MR) imaging system (110). The RF antenna device (140) has a tubular body and is segmented in its longitudinal direction (154). Each segment (162, 164) has at least one activation port. The result is that each mode, corresponding to an activation port, may be controlled individually. Accordingly, the inhomogeneity of the subject of interest in the longitudinal direction of the RF antenna device can directly be addressed. There are different ways to build up a z-segmented RF antenna device.
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公开(公告)号：US20230128603A1
公开(公告)日：2023-04-27
申请号：US17913455
申请日：2021-03-24
发明人： Peter Vernickel , Christian Findeklee , Christoph Günther Leussler , Oliver Lips , Ingo Schmale , Peter Caesar Mazurkewitz
摘要： The invention also refers to a flexible coil element for a flexible coil array, for a magnetic resonance imaging apparatus. The invention also refers to a flexible coil array, for a magnetic resonance imaging apparatus, for indicating a loading state of a flexible coil element being positioned on at least one inductive element. The invention also refers to a method for indicating a loading state of a flexible coil element being positioned on at least one inductive element. The flexible coil element is comprised by a flexible coil array, wherein the flexible coil array comprises at least one flexible coil element. Furthermore, the invention refers to a software package comprising instructions for carrying out the method steps.
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公开(公告)号：US11519982B2
公开(公告)日：2022-12-06
申请号：US17312967
申请日：2019-12-09
IPC分类号： G01R33/3415 , G01R33/28 , G01R33/36
摘要： A radio frequency (RF) system comprises an RF-array of antenna elements, a regulating arrangement to tune the antenna elements' impedances and a camera system to acquire image information of the RF-array. An analysis module is provided to derive operational settings such as resonant tuning settings, decoupling and impedance matchings of the antenna elements' impedances from the image information. The image information also represents the actual impedances and resonant properties of the RF-array. From the image information appropriate impedance settings can be derived that are the tuning parameters to render the RF-array resonant.
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公开(公告)号：US11454684B2
公开(公告)日：2022-09-27
申请号：US16490996
申请日：2018-03-05
发明人： Falk Uhlemann , Graham Michael Place , Ingmar Graesslin , Christian Findeklee , Oliver Lips , Cornelis Jacobus Hendrikus Blom
摘要： When predicting required component service in an imaging device such as a magnetic resonance (MR) imaging device (12), component parameters such as coil voltage, phase lock lost (PLL) events, etc. are sampled to monitor system components. Voltage samples are filtered according to their temporal proximity to coil plug-in and unplug events to generate a filtered data set that is analyzed by a processor (46) to determine whether to transmit a fault report. A service recommendation is received based on the transmitted report and includes a root cause diagnosis and service recommendation that is output to a user interface (50).
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公开(公告)号：US11372064B2
公开(公告)日：2022-06-28
申请号：US16564011
申请日：2019-09-09
发明人： Christian Findeklee , Oliver Lips
摘要： The invention relates to a magnetic resonance receive coil including a resonator for use in a magnetic resonance imaging system. The radio frequency receive coil according to the invention comprises a first conducting element of the resonator having a conductive loop wherein the received signal is induced in that loop, configured to form a primary resonant circuit tunable to at least one first resonance frequency and a second conducting element of the resonator configured to form an electric circuit electrically insulated from and reactively coupled to the primary resonant circuit, the electric circuit being adapted to detune the primary resonant circuit to at least one second resonance frequency. The second conducting element of the resonator has a conductive loop with a pair of ends connected to a preamplifier. The radio frequency receive coil further comprises an energy harvesting circuit electrically coupled in parallel over the pair of ends of the second conducting element, wherein the energy harvesting circuit is adapted for being connected to the second conducting element during transmission by a switch. A rechargeable power source is coupled to the energy harvesting circuit, wherein the rechargeable power source is adapted for being charged by the energy harvesting circuit. A switching component is circuited in parallel to the energy harvesting circuit, wherein is adapted to redirect a current as soon as the rechargeable power source is charged to a sufficient voltage. In this way, a magnetic resonance receive coil with a detune circuit and an energy harvesting circuit for energy harvesting is provided without a significant loss of detuning performance.
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公开(公告)号：US11099249B2
公开(公告)日：2021-08-24
申请号：US16754789
申请日：2018-09-26
摘要： The present invention is directed to a system comprising a body coil (9) for magnetic resonance imaging and an RF amplifier connected to the body coil (9) for feeding the body coil (9) with an RF signal, wherein the body coil (9) comprises two different ports (21, 22) for feeding the RF signal into the body coil (9), the body coil (9) is provided with a switch for selectively activating only one single port (21, 22) for feeding the RF signal to the body coil (9) at a time, and the two ports (21, 22) are located at different locations of the body coil (9) such that the dependence of the reflected part of the RF signal fed into the body coil (9) from the weight of the examination object (1) to which the body coil (9) is applied is different for the two ports (21, 22). In this way, a possibility for adapting a MRI measurement to different load situations due to different weights of an examination object (1) in an easy and efficient way is provided, thereby providing the possibility for impedance matching of the body coil by selecting the appropriate driven port.
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