MAGNETIC RESONANCE APPARATUS AND DATA ACQUISITION METHOD WITH DECOUPLING BETWEEN TRANSMIT AND RECEIVE COILS
First Claim
1. A method for acquiring magnetic resonance (MR) data, comprising:
- operating an MR data acquisition unit, comprising a transmit array and at least one reception coil with an operating sequence in order to acquire MR data from a subject;
in said operating sequence, radiating radio-frequency (RF) signals from said transmit array that excite nuclear spins in the subject, thereby causing MR signals to be emitted as a result of the excited nuclear spins, and detecting the MR signals with said at least one reception coil; and
operating said transmit array during said acquisition of said MR signals to cause said transit array to be electromagnetically decoupled from said at least one reception coil during said operation sequence.
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Abstract
In magnetic resonance data acquisition, decoupling between the transmit and receive coils is achieved by using a transmit array system wherein induced currents from the transmit coils cancel each other, resulting in a total of zero current in the receive coil. Forward and reversed polarized transmit coil pairs are set to cancel the individual currents of each other, or of a receive coil. Linearly polarized fields can also be used to effect the decoupling. The decoupling allows the magnetic resonance data acquisition system to be operated for concurrent excitation of the nuclear spins and reception of the resulting magnetic resonance signals.
30 Citations
16 Claims
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1. A method for acquiring magnetic resonance (MR) data, comprising:
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operating an MR data acquisition unit, comprising a transmit array and at least one reception coil with an operating sequence in order to acquire MR data from a subject; in said operating sequence, radiating radio-frequency (RF) signals from said transmit array that excite nuclear spins in the subject, thereby causing MR signals to be emitted as a result of the excited nuclear spins, and detecting the MR signals with said at least one reception coil; and operating said transmit array during said acquisition of said MR signals to cause said transit array to be electromagnetically decoupled from said at least one reception coil during said operation sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A magnetic resonance (MR) apparatus for acquiring MR data, comprising:
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an MR data acquisition unit comprising a transmit array and at least one reception coil; a control unit configured to operate said MR data acquisition unit according to an operating sequence in order to acquire MR data from a subject; a radio-frequency (RF) unit configured to operate said transmit array in said operating sequence, to cause said transmit array to radiate RF signals that excite nuclear spins in the subject, thereby causing MR signals to be emitted as a result of the excited nuclear spins, the MR signals being detected with said at least one reception coil; and said RF unit being configured to operate said transmit array during said acquisition of said MR signals to cause said transit array to be electromagnetically decoupled from said at least one reception coil during said operation sequence. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification