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MRI birdcage coil with distributed excitation

A technology of coils and birdcages, applied in instruments, measuring magnetic variables, measuring devices, etc., can solve problems affecting the uniformity of radio frequency magnetic excitation fields, etc.

Active Publication Date: 2017-08-18
KONINKLIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It is also known that for large field strengths such as 3T or higher static magnetic field B 0 , the dielectric-based standing-wave mechanism associated with the object of interest strongly affects the radio frequency magnetic excitation field B 1 Uniformity

Method used

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  • MRI birdcage coil with distributed excitation
  • MRI birdcage coil with distributed excitation
  • MRI birdcage coil with distributed excitation

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Embodiment Construction

[0107] In the following, several embodiments according to the present invention are disclosed. Individual embodiments are described with reference to particular figures and are identified by prefixed numerals of the particular embodiment. Features whose function is the same or substantially the same in all embodiments are identified by a reference number consisting of a prefixed numeral of the embodiment to which it relates, which is followed by a characteristic reference number. If features of an embodiment are not described in the corresponding figure depiction, or reference numerals mentioned in the figure depiction are not shown in the figure itself, reference should be made to the description of the previous embodiments.

[0108] figure 1 A schematic illustration of part of an embodiment of a magnetic resonance imaging system 110 configured to acquire at least a partial magnetic resonance image of a subject of interest 120 , typically a patient, according to the inventio...

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Abstract

A magnetic resonance radio frequency transmission device (140) for generating and applying a radio frequency excitation field B1 for the purpose of magnetic resonance examination comprises a birdcage coil (144) and a plurality of M radio frequency amplifier units for providing radio frequency power at a magnetic resonance frequency to the birdcage coil (144) via a plurality of M activation ports (158) selected out of the plurality of N activation ports (158). In an operational state of the birdcage coil (144) each radio frequency amplifier unit (142) is electrically connected and is arranged in close proximity to an activation port (158). Among the plurality of M radio frequency amplifier units (142), there is established a fixed relationship of adjustable phase angles (phi) of the magnetic resonance radio frequency power provided by the plurality of M radio frequency amplifier units (142); a method of generating and applying a radio frequency excitation field B for the purpose of magnetic resonance examination, using such magnetic resonance radio frequency transmission device (140); and a magnetic resonance imaging system (110) configured for acquiring magnetic resonance images of at least a portion of a subject of interest (120), comprising such magnetic resonance radio frequency transmission device (140).

Description

technical field [0001] The present invention relates to a magnetic resonance radio frequency transmission device for magnetic resonance examination purposes and the use of such a magnetic resonance radio frequency transmission device for generating and applying a radio frequency excitation field B for magnetic resonance examination purposes 1 Methods. Background technique [0002] In the field of magnetic resonance examination, a birdcage resonator, also known as a birdcage coil, is a radio-frequency magnetic device used to generate radiofrequency magnetic resonance excitation to be applied to or within an object of interest for magnetic resonance excitation. Excitation field B 1 A known volumetric radio frequency coil design of , wherein an object of interest is positioned at least partially within a birdcage coil, which in turn is placed in a static uniform magnetic field B 0 Within, the static uniform magnetic field B 0 is arranged substantially perpendicular to the ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/34G01R33/565
CPCG01R33/34076G01R33/3607G01R33/3614G01R33/3678G01R33/5659
Inventor E·霍莱
Owner KONINKLIJKE PHILIPS NV
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