Head radiofrequency coil for magnetic resonance imaging system

Abstract

The invention discloses a head radiofrequency coil for a magnetic resonance imaging system. The radiofrequency coil comprises a coil shell (1), a vacuum shield (2), a liquid nitrogen apparatus and a coil conductor (3). The radiofrequency coil is a radiofrequency receiving coil or an operable radiofrequency coil capable of both transmitting and receiving. The coil conductor (3) consists of end rings (4), legs (5) in even number and resonant capacitors (6), wherein the legs (5) parallel one another are connected to two ends of the end rings (4), and the resonant capacitors (6) are connected with the coil conductor (3). The coil conductor (3) of different structure can be selected according to different direction of a main magnetic field. The liquid nitrogen apparatus is arranged on the coil conductor (3) and refrigerates a coil through liquid nitrogen. The coil conductor can be used as the receiving coil or the receiving/transmitting coil, has good orthogonal receiving and excitation performance and has high uniformity in imaging areas. Since the conductor is cooled by the liquid nitrogen, loss caused in the magnetic resonance receiving process and thermal noise generated due to resistance can be reduced and the signal-to-noise ratio of acquired images is increased.

Description

technical field [0001] The invention relates to a head radio frequency coil for a magnetic resonance imaging system, in particular to a radio frequency coil which adopts liquid nitrogen refrigeration and uses coil conductors with receiving or transmitting / receiving to diagnose the head. Background technique [0002] At present, magnetic resonance imaging technology has been widely used in various large medical institutions in the world and has achieved huge and unique benefits in medical practice. These magnetic resonance imaging techniques not only have medical diagnostic value in identifying and evaluating pathology and judging the health status of the tested tissue, but also are widely used in clinical and research; although through unremitting efforts, magnetic resonance imaging has made great progress, but There is still a need for further improvements in magnetic resonance imaging, such as higher contrast, enhanced signal-to-noise ratio, faster acquisition speed, and / o...

AI Technical Summary

Problems solved by technology

[0004] The existing method is to improve the wiring to reduce the coupling capacitance of the overlapping parts of the coil, thereby increasing the Q value of the coil, but due to the limitation of the inherent resistance of the copper conductor at room temperature, the Q value is still not high enough, and the figure associated with the electronic thermal noise Image noise affects the imaging clarity. The conductor used is a normal temperature copper conductor. During the imaging process, in order to reduce the influence of the thermal noise and inherent resistance of the copper conductor in the copper conductor, the signal-to-noise ratio must be increased by extending the scan time, resulting in equipment The increase of the cost of use; the current commonly used coil design is mainly based on the normal temperature conductor, and generally cannot obtain a high no-load Q

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