MR local imaging coil operable as a receive only or a transmit/receive coil
First Claim
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1. A local imaging coil for use with a host MRI system, the coil comprising:
- at least one conductive loop;
a decoupling circuit connected to the at least one conductive loop; and
means for selecting a mode of operation of the local coil, said selecting means being coupled to said conductive loop and said decoupling circuit.
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Abstract
A local or surface coil including a decoupling circuit to allow the coil to operate as a receive-only coil in a host MRI system, in which case the system body coil typically provides the transmit signal. Further, the local or surface coil includes a circuit to defeat the decoupling circuitry for both low power [receive] and high power [transmit] functions to allow the same physical coil to be used as a transmit/receive coil in addition to a receive-only coil. The two modes of the coil allow the user to select the mode of local or surface coil operation best suited to the particular type of imaging being performed.
85 Citations
20 Claims
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1. A local imaging coil for use with a host MRI system, the coil comprising:
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at least one conductive loop;
a decoupling circuit connected to the at least one conductive loop; and
means for selecting a mode of operation of the local coil, said selecting means being coupled to said conductive loop and said decoupling circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A local imaging coil for use with a host MRI system, the coil comprising:
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at least one conductive loop;
a decoupling circuit connected to the at least one conductive loop; and
a two-state mode selection switch coupled to bypass the decoupling circuit in the conductive loop. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A local imaging coil for use with a host MRI system, the coil comprising:
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at least one conductive loop; and
a decoupling circuit connected between the at least one conductive loop and the host MRI system, said decoupling circuit comprising a capacitor coupled to an inductor coupled to a switching diode, wherein said decoupling circuit switches the coil between a receive only mode of operation and a transmit/receive mode of operation in accordance with bias signals applied by the host MRI system to the switching diode. - View Dependent Claims (15, 16)
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17. A local imaging coil for use with a host MRI system, the coil comprising:
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at least one conductive loop;
a decoupling circuit connected to the at least one conductive loop, said decoupling circuit comprising a switching diode; and
an interface unit coupled between the decoupling circuit and the host MRI system, wherein said decoupling circuit switches the coil between a receive only mode of operation and a transmit/receive mode of operation in accordance with bias signals supplied by the interface unit to the switching diode. - View Dependent Claims (18, 19, 20)
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Specification