MR-apparatus having a transmission-measuring coil for high frequencies
First Claim
1. An MR apparatus having a magnet system for generating a uniform, principal magnetic field in a measurement space, means for generating, in said measurement space, a spatially uniform radio-frequency alternating field and means for detecing an MR signal generated in an object under examination disposed in said measurement space, said generating means including a pair of radio-frequency coils which are spaced from each other so as to accommodate said object to be examined therebetween, each coil of said pair being comprised of at least two sections connected so as to form a loop and each section having a connection point, and means for coupling said connection point of each of said sections to a radio-frequency supply source.
1 Assignment
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Accused Products
Abstract
For increasing the sensitivity of an MR apparatus when measuring comparatively high frequencies, the radio frequency excitation measurement coil (10, 30) is divided into two individual symmetrically drivable and readable coil halves (32, 34), respectively. The mutual connection of central connections of the coil halves can be realized by means of a balun (54) but for this purpose any other symmetrical form of coupling, for example using a strip-line transformer (70) or suitably dimensioned coaxial cables (60, 62) may alternatively be used.
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Citations
7 Claims
- 1. An MR apparatus having a magnet system for generating a uniform, principal magnetic field in a measurement space, means for generating, in said measurement space, a spatially uniform radio-frequency alternating field and means for detecing an MR signal generated in an object under examination disposed in said measurement space, said generating means including a pair of radio-frequency coils which are spaced from each other so as to accommodate said object to be examined therebetween, each coil of said pair being comprised of at least two sections connected so as to form a loop and each section having a connection point, and means for coupling said connection point of each of said sections to a radio-frequency supply source.
Specification