公开(公告)号：EP2147326A1

公开(公告)日：2010-01-27

申请号：EP08737708.1

申请日：2008-04-03

申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

发明人： GRAESSLIN, Ingmar ,  VERNICKEL, Peter ,  DEN BOEF, Johannes, H.

IPC分类号： G01R33/36

CPC分类号： G01R33/3607

摘要： A method and an RF transmit system for generating RF transmit signals for feeding an RF transmitter (14) in the form of, or comprising, one or more antenna device(s), coil(s), coil elements, or coil array(s) is disclosed. Furthermore, a multi-channel RF transmit system for feeding a plurality of such RF transmitters, especially for use as an RF excitation system in a magnetic resonance imaging (MRI) system for exciting nuclear magnetic resonances (NMR) is disclosed. A demand RF transmit signal is compared in the digital domain with an RF transmit signal and digitally corrected with respect to differences or errors between both by means of a complex predistorter (11), an adaption unit (17) and a look-up table unit (18).

公开(公告)号：EP1664820B1

公开(公告)日：2008-10-22

申请号：EP04769909.5

申请日：2004-09-01

申请人： Koninklijke Philips Electronics N.V.

发明人： DEN BOEF, Johannes, H.

IPC分类号： G01R33/36

CPC分类号： G01R33/3692 ,  G01R33/3621 ,  G01R33/54 ,  G01R33/543

摘要： Dynamic adjustment of the receiver gain during an MRI scan. To account for magnitude and/or phase distortions introduced by the receiver that are not necessarily identical at various receiver gains, a reference rf signal is applied to the receive chain by an additional antenna. Preferably the reference signal is adjusted such that its frequency lies at the border of the frequency band detected by the MR scan. Comparing the a priori known amplitude and phase of the reference signal with the amplitude and phase of the received reference signal allows to determine the distortions introduced at the respective receiver gain which are subsequently corrected. In a further embodiment, the reference signal is used to synchronize the modulation and demodulation units of a wireless transceiver system.

公开(公告)号：EP1810047B1

公开(公告)日：2013-01-09

申请号：EP05797806.6

申请日：2005-10-31

申请人： Koninklijke Philips Electronics N.V.

发明人： VAN HELVOORT, Marinus, J., A., M. ,  VAN LIERE, Filips ,  DE VRIES, Lambertus ,  DEN BOEF, Johannes, H. ,  MELTERS, Marcellinus, H., M., W. ,  HAM, Cornelis, L., G. ,  SAES, Marc

IPC分类号： G01R33/3415

CPC分类号： G01R33/3692 ,  G01R33/3415 ,  G01R33/3621

公开(公告)号：EP1664820A1

公开(公告)日：2006-06-07

申请号：EP04769909.5

申请日：2004-09-01

申请人： Koninklijke Philips Electronics N.V.

发明人： DEN BOEF, Johannes, H.

IPC分类号： G01R33/36

CPC分类号： G01R33/3692 ,  G01R33/3621 ,  G01R33/54 ,  G01R33/543

摘要： Dynamic adjustment of the receiver gain during an MRI scan. To account for magnitude and/or phase distortions introduced by the receiver that are not necessarily identical at various receiver gains, a reference rf signal is applied to the receive chain by an additional antenna. Preferably the reference signal is adjusted such that its frequency lies at the border of the frequency band detected by the MR scan. Comparing the a priori known amplitude and phase of the reference signal with the amplitude and phase of the received reference signal allows to determine the distortions introduced at the respective receiver gain which are subsequently corrected. In a further embodiment, the reference signal is used to synchronize the modulation and demodulation units of a wireless transceiver system.

公开(公告)号：EP1966621A2

公开(公告)日：2008-09-10

申请号：EP06842625.3

申请日：2006-12-20

申请人： Koninklijke Philips Electronics N.V.

发明人： VAN HELVOORT, Marinus, J., A., M. ,  BENNETT, Jeff ,  SAES, Marc, P. ,  DE VRIES, Bert, L. ,  DEN BOEF, Johannes, H. ,  KLEIHORST, Robert, P. ,  BIRRU, Dagnachew

IPC分类号： G01R33/28

CPC分类号： G01R33/283 ,  G01R33/3692 ,  G01R33/56383

摘要： A method and an arrangement for uni- or bidirectional wireless communication of signals or data especially in a reflective environment like a MR imaging system, between at least one first transmitter and/or receiver unit (501, 601, 701; T/R1) and at least one second transmitter and/or receiver unit (801; T/R2) is disclosed. The reliability and availability of the communication link especially in a highly reflective environment is improved especially by using spread spectrum technology and ultra wide band carrier frequencies.

公开(公告)号：EP1810047A1

公开(公告)日：2007-07-25

申请号：EP05797806.6

申请日：2005-10-31

申请人： Koninklijke Philips Electronics N.V.

发明人： VAN HELVOORT, Marinus, J., A., M. ,  VAN LIERE, Filips ,  DE VRIES, Lambertus ,  DEN BOEF, Johannes, H. ,  MELTERS, Marcellinus, H., M., W. ,  HAM, Cornelis, L., G. ,  SAES, Marc

IPC分类号： G01R33/3415

CPC分类号： G01R33/3692 ,  G01R33/3415 ,  G01R33/3621

摘要： The invention relates to a device (1) for magnetic resonance imaging of a body (7) placed in a stationary and substantially homogeneous main magnetic field comprising a main magnet (2) for generation of a stationary and substantially homogeneous main magnetic field within the examination zone. In order to provide an MR device (1) which is arranged to allow for massive parallel imaging without extensive cabling between the individual receiving coils and the back end electronics, the invention proposes to make provision for a plurality of receiving units (10a, 10b, 10c) placed in or near the examination zone, which receiving units (10a, 10b, 10c) each comprise a receiving antenna (12a, 12b, 12c) for receiving MR signals from the body, a digitizing means (21a, 21b, 21c) for sampling the received MR signals and for transforming the signal samples into digital signals, and a transmitter (22a, 22b, 22c) for transmitting the digital signals to a central processing unit (13). Further, the device (1) comprises synchronization means (17) for synchronizing the operation of the individual digitizing means (21a, 21b, 21c) of the receiving units (10a, 10b, 10c).