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Simple decoupling of a multi-element RF coil, enabling also detuning and matching functionality

A technology of coils and components, applied in the field of magnetic resonance imaging coils and scanners, magnetic resonance systems, can solve problems such as unwanted resonance

Inactive Publication Date: 2009-05-06
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem in passive decoupling networks includes the presence of connector parasitic capacitance and inductance, which can cause unwanted resonances

Method used

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  • Simple decoupling of a multi-element RF coil, enabling also detuning and matching functionality
  • Simple decoupling of a multi-element RF coil, enabling also detuning and matching functionality
  • Simple decoupling of a multi-element RF coil, enabling also detuning and matching functionality

Examples

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Embodiment Construction

[0018] Referring to FIGS. 1 and 2 , a magnetic resonance imaging system 8 includes a scanner 10 including a housing 12 defining an examination region 14 in which a patient or other imaging subject 16 is positioned on a patient support or couch 18 . The main magnet 20 placed in the housing 12 generates the main magnetic field B in the examination region 14 0 . Typically, the main magnet 20 is a superconducting magnet surrounded by a cryogenic enclosure 24; however, resistive or permanent main magnets may also be used. different B 0 magnetic field, such as 3T or 7T, at 3T of B 0 Protons in the magnetic field have a resonant frequency of 128MHz, at 7T B 0 Protons in a magnetic field have a resonant frequency of 300 MHz. Magnetic field gradient coils 30 are arranged in or on housing 12 . In order to superimpose selected magnetic field gradients on the main magnetic field in the examination region 14 . An RF coil system or device 34 with a surrounding shield 40 is placed adja...

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Abstract

A coil (36) includes coil elements (381, 382, , 38n). The coil (36) can transmit radio frequency excitation pulses into an examination region (14) and / or receive responsive radio frequency pulses from the examination region (14). A compensation network (42) includes decoupling segments (98), which each has a selected electrical length at least of a quarter wavelength (lambda / 4) and is electrically coupled to an associated coil element (381, 382, , 38n) and a reactive network (100). The compensation network (42) at least compensates coupling between the coil elements (381, 382, , 38n).

Description

technical field [0001] This application relates to magnetic resonance technology. It has particular application to and is described with particular reference to magnetic resonance imaging coils and scanners. More generally, it is applied to magnetic resonance systems for imaging, spectroscopy, etc. Background technique [0002] Magnetic resonance imaging (MRI) equipment is commonly used for the examination of patients. In MRI, RF coils are used to generate B within the imaged subject 1 field to excite the nuclear spins and to detect the signal from the nuclear spins. [0003] In some multi-channel transmit / receive MRI systems, one of multiple transmit units is assigned to each RF coil or coil segment for independently adjusting the amplitude and / or phase and / or shape of the RF waveform to be transmitted; Simultaneously, one of the plurality of receiving units is assigned to each RF coil or coil segment. More specifically, the independent amplitude and / or phase and / or sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/36
CPCG01R33/365G01R33/3415
Inventor C·芬德科里
Owner KONINKLIJKE PHILIPS ELECTRONICS NV