Jeol Ltd.

Kenichi Hachitani

Takayuki Suzuki

Takeshi Tsukada

Kenya Izumi

Yukio Nishimura

Tetsuro Sugita

In a magnetic resonance measurement apparatus, when a frequency of an observation nucleus falls within a high frequency band, a frequency conversion scheme is selected. In this case, an intermediate frequency signal is generated as an original signal, which is then frequency-converted to generate an RF transmission signal. An RF reception signal is converted into an intermediate frequency signal by frequency conversion, and is sampled. When the frequency of the observation nucleus falls within a low frequency band, a non-conversion scheme is selected. In this case, an RF transmission signal is generated as the original signal, and an RF reception signal is sampled.

Magnetic resonance measurement apparatus with selective frequency conversion of transmission and/or reception signal

Procedure instruction sequences (P&#x2dc;P) in an instruction sequence (for example, an instruction sequence for an NMR spectrometer) are generated in a precedential manner, and transferred to a procedure storage area on a transmission and reception unit in a precedential manner. After the precedential transfer, a remaining portion of the instruction sequence (streaming instruction sequence (S, . . . )) is sequentially generated in predetermined units from the beginning, and sequentially transferred to a FIFO area on the transmission and reception unit. A sequencer refers to the streaming instruction sequence, executes the instruction, and refers to a procedure instruction sequence on the procedure storage area.

Magnetic resonance measurement apparatus with improved instruction sequence transfer

In a magnetic resonance measurement apparatus such as an NMR measurement apparatus, when a frequency of an observation nucleus falls within a high frequency band, an RF reception signal is converted into an intermediate frequency signal, and is input to an analog-to-digital converter. In this case, under-sampling is executed for the intermediate frequency signal in the analog-to-digital converter, and a second-order aliased signal component generated from a target signal component is observed. On the other hand, when the frequency of the observation nucleus falls within a low frequency band, over-sampling for the RF reception signal is executed.

Apparatus and method for processing reception signal in magnetic resonance measurement apparatus

In a magnetic resonance measurement apparatus, a plurality of transmission signals are combined to generate a digital combined signal. The digital combined signal is converted into an analog combined signal by a D/A converter. The signal includes, for example, a first pulse of a rectangular shape and a second pulse of a mountain shape. During measurement, an operation of a dynamic variable attenuator is changed immediately after the first pulse. With this process, the second pulse is suppressed, and a suppressed second pulse is generated.

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Kenichi Hachitani