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公开(公告)号：US11291860B2
公开(公告)日：2022-04-05
申请号：US16856356
申请日：2020-04-23
IPC分类号： A61N5/10 , G01R33/3873 , G01R33/48 , G01R33/3875
摘要： A magnetic resonance apparatus which may include: a body portion having a cavity with a first and second ends and at least one opening situated at one of the first and second ends. The cavity may define a longitudinal axis (LA) extending between the first and second ends. At least one main magnet may generate a main magnetic field having a substantially homogenous magnetic field within the cavity. A center shim (CS) which may be formed from a ring having opposed edges and which may extend along a length of the longitudinal axis of the cavity. One or more discrete shims (DSs) may be situated between the CS and at least one of the first and second ends.
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公开(公告)号：US10470662B2
公开(公告)日：2019-11-12
申请号：US15317480
申请日：2015-06-03
摘要： A magnetic resonance imaging gradient coil assembly (110) includes a cylindrical coil carrier tube (129). The cylindrical coil carrier tube has an inner surface (125) and an outer surface (129). The cylindrical coil carrier tube has a cylindrical axis of symmetry (200). The cylindrical coil carrier tube has a center (203). The cylindrical coil carrier tube has a photon detector ring receptacle (122) recessed into the inner surface of the cylindrical coil carrier tube. The detector ring receptacle is centered about the center. The photon detector ring receptacle includes side walls (126) formed from the cylindrical carrier tube and a solid back wall (128) formed from the cylindrical carrier tube. The magnetic resonance imaging gradient coil assembly further includes a set of magnetic resonance imaging gradient coils (208, 210) attached to the cylindrical coil carrier tube.
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公开(公告)号：US10018690B2
公开(公告)日：2018-07-10
申请号：US14652836
申请日：2013-12-11
CPC分类号： G01R33/243 , G01R33/34 , G01R33/385 , G01R33/58
摘要： The present invention provides a phantom (200) for use in a magnetic resonance (MR) imaging system (110) with a set of resonating volumes (206) positioned in a base body (202), whereby the base body (202) has a spherical or ellipsoid shape in accordance with a volume of interest (203) of the MR imaging system (110), and the resonating volumes (206) are located at a circumference of the base body (202). The phantom is used in a method for evaluating the magnetic field of a main magnet (114) of a magnetic resonance (MR) imaging system (110), comprising the steps of positioning the phantom (200) within the main magnet (114), performing a 3D spectroscopic MR measurement of the phantom (200) using the MR imaging system (110), thereby measuring resonances of the resonating volumes (206), assigning the measured resonances to the resonating volumes (206), and evaluating the magnetic field of the main magnet (114) from the MR measurement of the phantom (200) based on the measured resonances of the resonating volumes (206). Accordingly, the MR imaging system itself is directly used for determining the magnetic field of its main magnet. Accordingly, the MR imaging system itself can be used as measurement equipment, instead of a separate NMR magnetometer, which is required for conventional determination of the magnetic field.
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公开(公告)号：US09746533B2
公开(公告)日：2017-08-29
申请号：US14375354
申请日：2013-01-14
CPC分类号： G01R33/3642 , G01R33/34 , G01R33/3815 , H01F6/008 , H01F6/06 , H01F6/065 , H01H36/008
摘要： The invention provides for magnetic resonance imaging system (600) comprising a superconducting magnet (100) with a first current lead (108) and a second current lead (110) for connecting to a current ramping system (624). The magnet further comprises a vacuum vessel (104) penetrated by the first current lead and the second current lead. The magnet further comprises a magnet circuit (106) within the vacuum vessel. The magnet circuit has a first magnet circuit connection (132) and a second magnet circuit connection (134). The magnet further comprises a first switch (120) between the first magnet connection and the first current lead and a second switch (122) between the second magnet connection and the second current lead. The magnet further comprises a first current shunt (128) connected across the first switch and a second current shunt (130) connected across the second switch. The magnet further comprises a first rigid coil loop (124) operable to actuate the first switch. The first rigid coil loop forms a portion of the first electrical connection. The magnet further comprises a second rigid coil loop (126) operable to actuate the second switch. The second rigid coil loop forms a portion of the second electrical connection.
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公开(公告)号：US10543380B2
公开(公告)日：2020-01-28
申请号：US15025302
申请日：2014-09-22
摘要： The invention provides for a medical instrument (200, 300, 400, 500, 600, 700) comprising a magnetic resonance imaging system (204) operable for acquiring magnetic resonance data (266) from a subject (236) within an imaging zone (232) and an external beam radiotherapy system (202) operable for irradiating a target zone (238) within the imaging zone. The medical instrument further has a radiation beam generation system (208, 302, 302′, 302″) operable for generating a radiation beam (242, 304, 304′, 304″) and a radiation beam detection system (243, 502, 502′) operable for acquiring radiation beam detection data (270) descriptive of the radiation beam. Instructions cause a processor (248) controlling the instrument to receive (100) planning data (260) descriptive of a spatially dependent radiation dose and generate (102) external beam radiotherapy control commands (264) using the radiation dose. The instructions causes the processor to repeatedly: control (106) the external beam radiotherapy system to irradiate the target zone using the external beam radiotherapy system control commands; generate (108) the radiation beams using the radiation beam generation system; measure (110) the radiation beam detection data using the radiation beam detection system; acquire (112) the magnetic resonance imaging data using the magnetic resonance imaging system, generate (114) a magnetic resonance image (268) using the magnetic resonance image data, determine (116) a registration (274) of the magnetic resonance image to the radiation beam detection data; calculate (118) a mapping (276) using the registration; and modify the external beam radiotherapy system control commands using the mapping.
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公开(公告)号：US10433729B2
公开(公告)日：2019-10-08
申请号：US14895238
申请日：2014-05-23
IPC分类号： A61B5/00 , A61B5/055 , G21F7/00 , G01R33/28 , G01R33/385 , G01R33/422 , G01R33/48
摘要： An exam room shielding (10) for electromagnetically shielding a magnetic resonance imaging system (2) includes: a ceiling, a floor, side walls (11) interconnecting the ceiling and the floor, and a tubular shielding device (12), which is arranged to surround an examination tube (3) of the magnetic resonance imaging system (2). Both longitudinal ends (13) of the tubular shielding device (12) are circumferentially connected to openings (14)of the side walls (11) which form the outline of an U-shaped room (15) with the longitudinal ends (13) of the tubular shielding device (12) interconnecting the lateral flanks (16) of the U-shaped room (15). A magnetic resonance imaging system (2) includes an exam room (1), with the above exam room shielding (10). An additional treatment or diagnosis device (7) can be located at an outer circumference of the tubular shielding device (12). This separates the space inside the exam room into a compartment free of RF noise, i.e. the space surrounded by the exam room shielding, for MR scanning, and a compartment outside the shielding, in which an operator can move for operating the MR imaging system and/or preparing a person for a MR scan.
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公开(公告)号：US10132897B2
公开(公告)日：2018-11-20
申请号：US15599776
申请日：2017-05-19
IPC分类号： G01V3/00 , G01R33/56 , G01R33/48 , A61N5/10 , G01R33/3873 , G01R33/3875
摘要： A magnetic resonance imaging system (302) includes a magnet (306) for generating the magnetic field within an imaging zone 318. The magnet generates a magnetic field with a zero crossing (346, 404) outside of the imaging zone. The medical apparatus further includes a gantry (332) configured for rotating a ferromagnetic component (336, 510) about a rotational axis (333). A magnetic correcting element (348, 900, 1000) is located on a radial path (344, 504) perpendicular to the rotational axis. The magnetic correcting element is positioned on the radial path such that change in the magnetic field within the imaging zone due to the ferromagnetic component is reduced.
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公开(公告)号：US20140316249A1
公开(公告)日：2014-10-23
申请号：US14356223
申请日：2012-11-06
CPC分类号： G01R33/287 , A61N5/1001 , A61N5/1007 , A61N5/1039 , A61N2005/1022 , A61N2005/1055 , A61N2005/1089 , A61N2005/1094 , G01R33/48
摘要： A miniature X-ray source (10) for high dose rate brachytherapy that can be operated in a wide range of operating directions (76) in the presence of a strong magnetic field (B), such as, for instance, the static magnetic field (B) of an MR scanner, with at least one anode (12) and at least one cathode (14), wherein in an operative state, an electric field (18) between the anode (12) and the cathode (14) is essentially spherically symmetric in at least a continuous solid angle of more than π/2 sr about a center (16) of the cathode (14); a brachytherapy system, comprising at least one said miniature X-ray source (10), and a method for generating a beam (82) of X-ray radiation inside an outer magnetic field (B) or an operative MR scanner with said miniature X-ray source (10).
摘要翻译： 一种用于高剂量率近距离放射治疗的微型X射线源（10），其可以在强磁场（B）的存在下在宽范围的操作方向（76）下操作，例如静态磁场 （12）和至少一个阴极（14）的MR扫描器（B），其中在工作状态下，阳极（12）和阴极（14）之间的电场（18）是 在阴极（14）的中心（16）的至少一个连续立体角以上大体上相对于对称; 包括至少一个所述微型X射线源（10）的近距离放射治疗系统，以及用于在外部磁场（B）或具有所述微型X的操作MR扫描器中产生X射线辐射束（82）的方法 射源（10）。
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公开(公告)号：US10894174B2
公开(公告)日：2021-01-19
申请号：US15777929
申请日：2016-12-01
IPC分类号： A61N5/10 , G01R33/38 , G01R33/3815 , G01R33/48 , A61B5/055
摘要： The following relates generally to use of magnetic resonance (MR) imaging as guidance in radiation therapy, and more specifically to use of MR imaging as guidance in proton therapy. In some embodiments, a cryogenic dewar is provided with multiple channels allowing a proton beam from a proton beam source to pass through. The proton beam may first be aligned with a first channel, and the dewar may then be rotated along with the proton source. The dewar may then be rotated to align a second channel with the proton beam.
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公开(公告)号：US10850127B2
公开(公告)日：2020-12-01
申请号：US15319984
申请日：2015-06-19
IPC分类号： A61N5/10 , G01R33/38 , G01R33/48 , G01R33/3875 , A61B5/055
摘要： The present invention provides a medical apparatus (100) comprising a magnetic resonance imaging system (110) for acquiring magnetic resonance data from an imaging volume (122) covering at least partially a subject of interest (120), wherein the magnetic resonance imaging system (110) comprises a main magnet (112) for generating a magnetic field within the imaging volume (122), a particle beam apparatus (150) having a particle beam line (152) for a particle beam (154) of charged particles, including a gantry (156) configured for rotating around a rotational axis (R), which is arranged in the longitudinal direction of the main magnet (112), wherein the gantry (156) comprises at least one bending magnet (158) for directing the particle beam (154) to an irradiation volume (124) within the imaging volume (122), an active compensation coil (200), which is arranged to substantially surround at least the imaging volume (122), and a control unit (132) for controlling the active compensation coil (200) for canceling a stray field caused by the at least one bending magnet (158) within the imaging volume (122) at least in the longitudinal direction of the main magnet (112). The present invention also provides a shielding method for use in the above medical apparatus (100).
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