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

A magnetic resonance measurement apparatus comprising:

• an analog-to-digital converter circuit to which an analog reception signal including a target signal component having a first frequency is input, that samples the analog reception signal at a sampling frequency which is a second frequency, and that outputs a digital reception signal;
• and
• a signal processor circuit that executes a signal processing on the digital reception signal, wherein
• when the first frequency satisfies an over-sampling condition, a sampling scheme of the analog-to-digital converter circuit is an over-sampling scheme, and the signal processor circuit executes the signal processing on the target signal component, and
• when the first frequency satisfies an under-sampling condition, the sampling scheme of the analog-to-digital converter circuit is an under-sampling scheme, and the signal processor circuit executes the signal processing on an aliased signal component generated from the target signal component, and wherein
• a frequency converter circuit is provided upstream of the analog-to-digital converter circuit,
• the frequency converter circuit converts a radio frequency (RF) reception signal into an intermediate frequency signal when a frequency determined according to an observation nucleus falls within a high frequency band, and does not convert the RF reception signal into the intermediate frequency signal and outputs the RF reception signal when the frequency determined according to the observation nucleus falls within a low frequency band which is lower than the high frequency band,
• the RF reception signal or the intermediate frequency signal is input to the analog-to-digital converter circuit as the analog reception signal,
• the first frequency satisfies the over-sampling condition when the first frequency is the frequency determined according to the observation nucleus and the RF reception signal is input to the analog-to-digital converter circuit, and
• the first frequency satisfies the under-sampling condition when the first frequency is an intermediate frequency and the intermediate frequency signal is input to the analog-to-digital converter circuit.