Back to results
US 10,241,163 B2Granted
TEM resonator system especially for use in an MRI system
AssigneeKoninklike Philips N.V.
InventorsOliver Lips, Falk Uhlemann, Volkmar Schulz
Life of this patent
Estimating the term…
Abstract
A TEM resonator system includes at least two TEM resonators, especially in the form of TEM volume coils, and especially for use in an MR imaging system or apparatus for transmitting RF excitation signals and/or for receiving MR signals into/from an examination object or a part thereof, respectively. The TEM resonators are arranged and displaced along a common longitudinal axis, and an intermediate RF shield is positioned in longitudinal direction between the two TEM resonators for at least substantially preventing electromagnetic radiation from emanating from between the first TEM resonator and the second TEM resonator into the surroundings.
Claims16
A transverse electromagnetic (TEM) resonator system, comprising:
- a first TEM cylindrical volume resonator which comprises a first RF shield and a plurality of first conductors which are capacitively or galvanically coupled to the first RF shield;
- a second TEM cylindrical volume resonator which comprises a second RF shield and a plurality of second conductors which are capacitively or galvanically coupled to the second RF shield;
- a third TEM cylindrical volume resonator which comprises a third RF shield and a plurality of third conductors which are capacitively or galvanically coupled to the third RF shield;
- and
- a first intermediate RF shield which is positioned between the first TEM cylindrical volume resonator and the second TEM cylindrical volume resonator, and which capacitively or galvanically connects the first RF shield with the second RF shield, and
- a second intermediate RF shield is positioned between the second TEM cylindrical volume resonator and the third TEM cylindrical volume resonator,
- wherein the first, second, and third TEM cylindrical volume resonators are arranged and displaced from each other along a common longitudinal axis which is aligned with the respective longitudinal axis of each of the first TEM cylindrical volume resonator, the second cylindrical TEM volume resonator, and the third TEM cylindrical volume resonator,
- wherein the first intermediate RF shield includes a first radial ring, a second radial ring, and at least one longitudinal ring, the first and second radial rings and the at least one longitudinal ring being arranged coaxial with the common longitudinal axis,
- wherein at least one of:
- an inner radial dimension of the first radial ring, an outer radial dimension of the first radial ring, an inner radial dimension of the second radial ring, an outer radial dimension of the second radial ring, an axial length of the at least one longitudinal ring, and a radial dimension of the at least one longitudinal ring is dimensioned for at least substantially preventing electromagnetic radiation from emanating outward from between the first TEM cylindrical volume resonator and the second TEM cylindrical volume resonator toward a region surrounding the TEM resonator system.
7 more elements
A TEM resonator system comprising:
- a first TEM cylindrical volume resonator which comprises a first RF shield and a plurality of first conductors which are capacitively or galvanically coupled to the first RF shield;
- a second TEM cylindrical volume resonator which comprises a second RF shield and a plurality of second conductors which are capacitively or galvanically coupled to the second RF shield;
- and
- an intermediate RF shield which is positioned between the first TEM cylindrical volume resonator and the second TEM cylindrical volume resonator and which capacitively or galvanically connects the first RF shield with the second RF shield,
- wherein the first and second TEM cylindrical volume resonators are arranged and displaced from each other along a common longitudinal axis which is aligned with the respective longitudinal axis of each of the first TEM cylindrical volume resonator and the second cylindrical TEM volume resonator,
- wherein the intermediate RF shield includes a first radial ring, a second radial ring, and at least one longitudinal ring, the first and second radial rings and the at least one longitudinal ring being arranged coaxial with the common longitudinal axis,
- wherein at least one of:
- an inner radial dimension of the first radial ring, an outer radial dimension of the first radial ring, an inner radial dimension of the second radial ring, an outer radial dimension of the second radial ring, an axial length of the at least one longitudinal ring, and a radial dimension of the at least one longitudinal ring is dimensioned for at least substantially preventing electromagnetic radiation from emanating outward from between the first TEM cylindrical volume resonator and the second TEM cylindrical volume resonator toward a region surrounding the TEM resonator system,
- wherein at least one of the first RF shield and the second RF shield of the first TEM cylindrical volume resonator and the second TEM cylindrical volume resonator, respectively, comprises:
- a proximal part which is positioned adjacent the intermediate RF shield,
- a distal part which continues the proximal part in an axial direction, wherein the proximal part comprises a longitudinal ring having a radial dimension which is greater than a radial dimension of the distal part, and
- a radial ring which galvanically connects the longitudinal ring with the distal part of the at least one of the first RF shield and the second RF shield.
9 more elements
Dependencies are inferred from the claim text.