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1. 发明授权

US11644518B2 Compensation of magnetic field components caused by a periodic motion of a cold head 有权
公开(公告)号：US11644518B2
公开(公告)日：2023-05-09
申请号：US16475469
申请日：2018-01-12
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Cornelis Leonardus Gerardus Ham , Filips Van Liere
IPC分类号： G01V3/00 , G01R33/38 , G01R33/3815 , G01R33/3875 , G01R33/565
CPC分类号： G01R33/3804 , G01R33/3815 , G01R33/3875 , G01R33/56563
摘要： The present invention provides a method for compensation of periodic B0 modulations from a periodic motion of a cold head (212) of a main magnet (114) of a magnetic resonance (MR) imaging system (110), whereby main windings (200) of the main magnet (114) are cooled to superconductivity by the cold head (212), which exerts a repetitive motion, the method comprising the steps of measuring a periodic occurrence of spatial field components of the B-field based on a motion of the cold head (212) as a function of time, performing a sensor measurement of a periodic, auxiliary parameter of the MR imaging system (110), which is not the periodic occurrence of spatial field components, synchronizing the periodic occurrence of spatial field components of the B-field with the measured periodic, auxiliary parameter of the MR imaging system (110), and triggering based on the measured periodic sensor measurement of the MR imaging system (110) a periodic application of compensation signals to compensate the periodic occurrence of spatial field components of the B-field based on a motion of the cold head (212). Furthermore, the present invention provides a MR imaging system (110) for providing an image representation of a region of interest (142) of a subject of interest (120) positioned in an examination space (116) of the MR imaging system (110), wherein the MR imaging system (110) is adapted to perform the above method.

2. 发明授权

US10983186B2 Supporting structure for a gradient coil assembly of a MRI 有权
公开(公告)号：US10983186B2
公开(公告)日：2021-04-20
申请号：US16468320
申请日：2017-12-13
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Jun Pan , Jian Lin , Xianrui Huang , Cornelis Leonardus Gerardus Ham , Yan Zhao , Yun Zhou
IPC分类号： G01R33/385 , G01R33/3873 , G01R33/421
摘要： A gradient coil assembly (62) for use in a Magnetic Resonance Imaging (MRI) system includes primary coils (68), shield coils (72) and a supporting structure (10) arranged between the primary coils (68) and the shield coils (72). The supporting structure (10) includes at least a supporting element (12) including a first end face (14) and at least a first recess (24) with an opening (26) in the first end face (14). The first recess (24) extends in a longitudinal direction (18) of the supporting element (12) forming a tray for receiving a passive shim bar.

3. 发明授权

US10317013B2 Dynamic boil-off reduction with improved cryogenic vessel 有权
公开(公告)号：US10317013B2
公开(公告)日：2019-06-11
申请号：US15037062
申请日：2014-10-17
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Cornelis Leonardus Gerardus Ham
IPC分类号： F17C13/00 , G01R33/38 , G01R33/3815 , H01F6/04 , F17C3/08
摘要： The present invention provides acryogenic vessel (200), in particular for use in a magnetic resonance examination system (110) to mount therein superconductive main coils (142, 144) of the magnetic resonance examination system (110), comprising an inner vessel (202), an outer 300K vessel (204), and a radiation shield (206), which is located between the inner vessel (202) and the outer 300K vessel (204) and which surrounds the inner vessel (202), whereby the radiation shield (206) has at least one dry-friction area (206), where dry-friction is generated upon deformation of the radiation shield (206). The present invention also provides a superconductive magnet (114) for a magnet resonance examination system (110) comprising a set of superconductive main coils (142, 144), which are arranged in the above cryogenic vessel (200). The present invention further provides a magnet resonance examination system (110) comprising the above superconductive magnet (122).

4. 发明授权

US10761163B2 Cryogenic field sensing for compensating magnetic field variations in magnetic resonance imaging magnets 有权
公开(公告)号：US10761163B2
公开(公告)日：2020-09-01
申请号：US16305946
申请日：2017-06-05
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Gerardus Bernardus Jozef Mulder , Cornelis Leonardus Gerardus Ham
IPC分类号： G01R33/389 , G01R33/3815 , G01R33/421 , H01F6/00
摘要： A superconducting magnet includes superconducting magnet coils (C1, C2, C3, C4, C5, C6, S1, S2) disposed inside a magnet cryostat (12). The superconducting magnet coils generate a static (B0) magnetic field when an electric current flows in the superconducting magnet coils. A superconducting B0 compensation circuit (30, 60, 70) is also disposed inside the magnet cryostat, and is coupled with the superconducting magnet coils to passively reduce temporal variations in the B0 magnetic field generated by the superconducting magnet coils. An electric current sensor (40) is also disposed inside the magnet cryostat and is connected to measure electric current flowing in the superconducting B0 compensation circuit. An active B0 compensation component (50) is operatively connected with the electric current sensor to receive the measurement of electric current flowing in the superconducting B0 compensation circuit and to provide active B0 magnetic field compensation based on the measured electric current.

5. 发明授权

US10436869B2 Positioning of a magnetic resonance imaging antenna within the homogeneous field zone 有权
公开(公告)号：US10436869B2
公开(公告)日：2019-10-08
申请号：US15319961
申请日：2015-06-25
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Cornelis Leonardus Gerardus Ham
IPC分类号： G01R33/54 , A61B5/055 , G06T11/00
摘要： The invention provides for a magnetic resonance imaging system (100) comprising: a magnet (104) for generating a main magnetic field with a homogeneous field zone (108); an antenna (124, 900, 1000) with an imaging zone (126) that has a fixed geometric relationship with portion (119) of a subject (118); a radio frequency system (114, 116, 124) for generating a radio frequency pulse (602); a magnetic gradient field system (110, 112); and a patient support (120, 122) for automatically moving the antenna and the portion of the subject from outside of the homogeneous field zone to within the homogeneous field zone along a movement axis. Machine executable instructions (180, 182, 184, 186, 188) cause a processor (136) controlling the magnetic resonance imaging system to: move the antenna and the portion from outside of the homogeneous field zone to within the homogeneous field zone along the movement axis; control (402) the radio frequency system to repeatedly generate a radio frequency pulse; control (404) the magnetic gradient field system to generate a gradient magnetic field during movement of the subject support only along the movement axis; control (406) the radio frequency system to repeatedly measure the radio frequency signal from the portion of the subject using the antenna; determine (408) a current location (128) of the antenna or of the imaging zone using the radio frequency signal; and control (410) the patient support to decelerate and halt at a predetermined location (109) within the homogeneous field zone using the current location.

6. 发明授权

US10126389B2 Gradient coil assembly with outer coils comprising aluminum 有权
公开(公告)号：US10126389B2
公开(公告)日：2018-11-13
申请号：US14781608
申请日：2014-03-21
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Cornelis Leonardus Gerardus Ham
IPC分类号： G01V3/00 , G01R33/385 , H01F6/06
摘要： The present invention provides a gradient coil assembly (122) for use in a magnetic resonance imaging system (110) comprising a set of inner coils (142) and a set of outer coils (144), which are concentrically arranged in respect to a common rotational axis of the set of inner and outer coils (142, 144), wherein the set of inner coils (142) and a set of outer coils (144) can be controlled to generate gradient magnetic fields within an inner space of the gradient coil assembly (122), and at least one coil (152, 154, 156) of the set of outer coils (144) is at least partially made of aluminum. The present invention further provides a magnetic resonance (MR) imaging system (110) comprising the above magnetic gradient coil assembly (122). By replacing at least a part of one coil of the outer coils by aluminum, the gradient coil assembly (122) can be significantly improved in respect to cost and weight without reducing the accuracy in respect to the generation of diagnostic images based on magnetic resonance information. Accordingly, the outcome of an MR scan is not reduced. The outer coils usually contain about half the weight of the copper used for state of the art gradient coil assemblies.

7. 发明申请

US20140333306A1 USE OF GRADIENT COILS FOR CORRECTING HIGHER ORDER BO FIELD INHOMOGENEITIES IN MR IMAGING 有权
标题翻译：梯度线圈用于校正MR成像中较高订购率的现场非均质性
公开(公告)号：US20140333306A1
公开(公告)日：2014-11-13
申请号：US14367612
申请日：2012-12-11
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Cornelis Leonardus Gerardus Ham
IPC分类号： G01R33/3875
CPC分类号： G01R33/3875 , G01R33/385
摘要： The invention relates to a method of correcting higher order B0 magnetic field inhomogeneities in the examination volume of an MR device. According to the invention, currents through two or more coil sections (X1, X2) of at least one of a plurality of gradient coils (4) are independently controlled in such a manner that higher order field inhomogeneities of the main magnetic field B0 are compensated for by the magnetic field of the at least one gradient coil (4).
摘要翻译：本发明涉及一种校正MR器件检查体积中高阶B0磁场不均匀性的方法。根据本发明，通过多个梯度线圈（4）中的至少一个的两个或更多个线圈段（X1，X2）的电流被独立地控制，使得主磁场B0的高阶磁场不均匀性被补偿通过至少一个梯度线圈（4）的磁场。

8. 发明授权

US10690734B2 Magnetic resonance examination system with fluid cooling arrangement 有权
公开(公告)号：US10690734B2
公开(公告)日：2020-06-23
申请号：US15772674
申请日：2016-10-28
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Cornelis Leonardus Gerardus Ham
IPC分类号： G01R33/28 , H01F6/04 , G01R33/34 , G01R33/38 , G01R33/385 , G01R33/3815
摘要： A magnetic resonance examination system comprises cooling clients (113, 144, 115) from which heat is carried-off by way of a system cooling circuit. A heat source (109) is in thermal contact with the system cooling circuit. A main pump (107) drives flow of the coolant in the system cooling circuit. The coolant is kept in motion and may be heated by the heat source. Thus, freezing of the coolant is avoided without the need of antifreeze. A back-up pump (121) of lower performance requirements may maintain flow of the coolant even if the main pump fails. A low viscosity coolant, such as water may be used. The system also contains a shut-off valve (127) and a short-circuit (141) parallel to the shut-off valve.

9. 发明授权

US10024935B2 MRI gradient amplifier operable at different slew rates 有权
公开(公告)号：US10024935B2
公开(公告)日：2018-07-17
申请号：US14416075
申请日：2013-07-24
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Cornelis Leonardus Gerardus Ham
IPC分类号： G01R33/36 , G01R33/385
摘要： The present invention relates to a method for supplying current to a gradient coil (107,207) of a magnetic resonance imaging system (100) by a gradient amplifier (222), the method comprising: supplying, by an electrical power supply (241), a voltage at first level to the gradient amplifier output to generate a gradient current in the gradient coil (107,207) to produce a magnetic gradient field at an slew rate, wherein the slew rate is set to a first value, resetting the slew rate to a second value, comparing the second value to the first value, and adjusting the voltage to a second level if the second value is different from the first value.

10. 发明授权

US11500050B2 Energizing and discharging a superconducting magnet of an MRI system 有权
公开(公告)号：US11500050B2
公开(公告)日：2022-11-15
申请号：US17356599
申请日：2021-06-24
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Cornelis Leonardus Gerardus Ham
IPC分类号： G01R33/3815 , G01R33/385 , H01F6/02
摘要： A magnetic resonance imaging (MRI) system includes a superconducting magnet assembly with a superconducting field coil for generating a stationary uniform main magnetic field. A gradient system includes a gradient coil for generating gradient magnetic fields and a gradient amplifier which is connectable to the gradient coil for driving the gradient coil. A switch assembly is adapted for galvanically coupling the superconducting field coil to the gradient amplifier. In this way, it is possible for energizing and discharging a superconducting magnet of an MRI system in an easy and cost-efficient way.

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