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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. 发明公开

US20230375646A1 RADIO FREQUENCY RECEIVER SYSTEM 审中-公开
公开(公告)号：US20230375646A1
公开(公告)日：2023-11-23
申请号：US18031013
申请日：2021-09-26
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Filips Van Liere , Sotir Filipov Ouzounov
IPC分类号： G01R33/36
CPC分类号： G01R33/3621 , G01R33/3607
摘要： For a radio frequency (RF) receiver system (1) for providing magnetic resonance (MR) information from an examination space of a MR imaging system, a solution for increasing the dynamic range of the radio frequency (RF) receiver system (1) for a better imaging performance shall be created. A sigma delta ADC of the RF receiver system operates in single-bit mode with an automatic gain control (AGC) circuit used to control the DAC feedback strength thereby extending the dynamic range of the receiver to match the MRI signal. The present invention also refers to a magnetic resonance (MR) imaging system, a method A method for extending the dynamic range of a radio frequency (RF) receiver system, a software package for a magnetic resonance (MR) imaging system, a software package for upgrading a magnetic resonance (MR) imaging system and a computer program product.

3. 发明授权

US11275134B2 Method and apparatus for improving data communications link efficiency and robustness in a magnetic resonance imaging (MRI) system 有权
公开(公告)号：US11275134B2
公开(公告)日：2022-03-15
申请号：US16335860
申请日：2017-09-29
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Paul Franz Redder , Arne Reykowski , Filips Van Liere
IPC分类号： G01R33/36 , H03M13/35 , G01R33/48
摘要： In MRI system, acquired MR signals that will have a greater impact on the quality of the final reconstructed MRI image if a data link error occurs are encoded with a higher, or more robust, level of encoding prior to being transmitted over a data communications link. Conversely, acquired MR signals that will have a lesser impact on the quality of the final reconstructed MRI image if a data link error occurs are encoded with a lower, or less robust, level of encoding prior to being transmitted over the data communications link. The overall result is improved data link robustness and efficiency for data being sent over the data link.

4. 发明公开

US20240142552A1 PHASE-COHERENT READ-OUT OF MRI SENSOR NODES 审中-公开
公开(公告)号：US20240142552A1
公开(公告)日：2024-05-02
申请号：US18280692
申请日：2022-03-03
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Filips Van Liere , Cumhur Erdin , Sotir Filipov Ouzounov
IPC分类号： G01R33/36
CPC分类号： G01R33/3621
摘要： The invention relates to phase-coherent read-out of sensor nodes (3) of a magnetic resonance imaging system (1) with a digital serial communication network (2). According to the invention, the network (2) comprises multiple sensor nodes (3) for detecting a radio frequency signal from a patient who is under examination by the magnetic resonance imaging system (1), and a host node (4) which is connected to the sensor nodes (3) via a network link (5) for merging and processing digital sensor data received from the sensor nodes (3), wherein the host node (4) comprises a receiver (6) connected to the network link (5) for receiving data over the network link (5), and a transmitter (7) connected to the network link (5) for transmitting data over the network link (5), the sensor nodes (3) each comprise an analog-to-digital converter (8) for converting the detected radio frequency signal to the digital sensor data, a receiver (9) connected to the network link (5) for receiving data over the network link (5), a transmitter (10) connected to the network link (5) for transmitting data over the network link (5), and a clock and data recovery unit (11) with a clock device which is configured for miming on a preset free-running frequency, the frequency of the data transmission over the network link (5) is set to a fixed frequency relative to the preset free-running frequency of the clock devices, and the clock and data recovery units (11) are configured for generating a recovered clock signal for controlling the analog-to-digital converter (8) of their sensor node by regulating the frequency of the clock device of their sensor node (3) to lock to the frequency of the data transmission over the network link (5). In this way, the possibility of phase coherent sensory data acquisition with a magnetic resonance imaging system (1) is provided in a robust and cost-efficient way.

5. 发明公开

US20240085508A1 MAGNETIC RESONANCE EXAMINATION METHOD 审中-公开
公开(公告)号：US20240085508A1
公开(公告)日：2024-03-14
申请号：US18274773
申请日：2022-01-24
申请人： KONINKLIJKE PHILIPS N.V.
发明人： Miha Fuderer , Jacques Den Boer , Filips Van Liere
IPC分类号： G01R33/56 , G01R33/58
CPC分类号： G01R33/5608 , G01R33/583
摘要： A magnetic resonance examination method comprises acquisition of a set of magnetic resonance signals from magnetic spins in an object by way of a receiver antenna, the magnetic resonance signals' signal levels are related to an independent reference level that is independent of the receiver antenna's sensitivity to form a calibrated signal level of the magnetic resonance signals, the calibrated signal levels are recorded in terms of a relative density of ordered transverse spins (DOTS). The independent reference level may be derived from the signal-to-thermal-noise ratio. The calibrated signal level in terms of DOTS in μM/T reflects predominantly a tissue property (of (a voxel of) the patient to be examined) as well as details or characteristics of the acquisition sequence used.

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