EIGHT-CHANNEL RF COIL FOR ULTRA-HIGH-FIELD MAGNETIC RESONANCE IMAGING Russian patent published in 2022 - IPC G01R33/34 

FIELD: magnetic resonance imaging.

SUBSTANCE: invention relates to magnetic resonance imaging. The substance of the invention lies in the fact that an eight-channel radio frequency coil for an ultrahigh-field magnetic resonance tomograph is integrated into its body and contains eight transmit-receive antenna elements, which are metal strips made in the form of metallizations on dielectric substrates placed inside a horizontally located straight metal prism parallel to its eight side faces with an angle between the planes of the antenna elements equal to 135°, and connected through matching circuits consisting of non-magnetic capacitors with a capacitance from 1 to 100 pF with coaxial cables that are the inputs/outputs of the coil, while the straight prism is made octahedral with the length of the side faces a ≥20000/f m, where f is the operating frequency of the tomograph in MHz, and the width is b≥.2 m, the antenna elements are solid rectangular strips, the large sides of which are parallel to the edges of the prism and have a length L=k15000/f, where k is coefficient with a value from 0.9 to 1.1, and the width is not less than 0.195 m, connected through matching circuits only to the central cores of coaxial cables, the braids of which are attached to the side faces of the prism, the thickness of the dielectric substrate lies in the range from 0.02÷0.05 m, and in the gap between the edges of the antenna elements Pairs of metal frames are electrically isolated with a length parallel to the larger side of the antenna element, within 0.75L÷1.25L and a width of 0.02÷0.05 m, the planes of each pair of frames are parallel to the bisector planes of the dihedral angles of the prism, and the frames of each pair interconnected by a non-magnetic trimmer capacitor with a capacity of 0.5÷5 pF and are located relative to each other at a distance of 0.001 m to the size of the gap, limited by the size of the gap between the nearest edges of the antenna elements.

EFFECT: increase in the level of the radio frequency magnetic field in the scan object at the time of transmission of RF pulses during MR imaging.

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