Apparatus to excite and/or to detect magnetic resonance
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United States of America Patent
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-
May 3, 1994
Grant Date -
N/A
app pub date -
Apr 9, 1992
filing date -
Apr 9, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus serves to excite and/or measure magnetic resonance in samples, in particular in relation to whole body tomography. A probehead (10) incorporates a high frequency system to transmit and/or to detect a high frequency magnetic field of a predetermined measuring frequency. The probehead (10) further incorporates a coil system to produce a magnetic field of predetermined inhomogeneity inside an inner space (13) of the probehead (10) varying according to a predetermined time program. Elements of the high frequency system are combined with elements of the coil system into common construction units. In addition, a signal processing unit for measured resonance signals is provided for. The construction units are in the form of hollow bodies (20). Coils (33) of the coil system are located inside the hollow bodies (20). Conductive outer walls (21) of the hollow bodies (20) form the high frequency system. The walls (21) exhibit a thickness (d) which is greater than the penetration depth of the measuring frequency but small enough to damp eddy currents in the wall (21) produced by the time-varying inhomogeneous magnetic field to such an extent that the time-variant inhomogeneous magnetic field essentially can penetrate the wall (21).
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