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MULTICOIL LOW-FIELD NUCLEAR MAGNETIC RESONANCE DETECTION AND IMAGING APPARATUS AND METHOD
MULTICOIL LOW-FIELD NUCLEAR MAGNETIC RESONANCE DETECTION AND IMAGING APPARATUS AND METHOD
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机译:多线圈低场核磁共振成像成像装置及方法
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摘要
A multicoil NMR detection and imaging apparatus allows multicoil NMR detection and imaging to be performed efficiently at low operating frequencies. The apparatus comprises an AC voltage generator, a transmit switching circuit, a coil switching network, an array of two or more detection coils, a set of receive switching circuits with one switching circuit for each detection coil, and a set of preamplifier circuits with input impedance substantially greater than the impedance of each respective detection coil at the intended operating frequency. The AC generator produces an alternating current waveform that is routed through one of more detection coils during transmit mode while the preamplifier circuits are isolated from the detection coil(s). During receive mode the AC generator is isolated from the detection coils to prevent noise from the transmitter from degrading the quality of received signals.
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