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RF transmission circuit, complex digital synthesizer, and MRI apparatus

  • US 6,862,435 B2
  • Filed: 07/03/2002
  • Issued: 03/01/2005
  • Est. Priority Date: 07/04/2001
  • Status: Expired due to Fees
First Claim
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1. An RF transmission circuit comprising:

  • a system interface which receives control data from outside;

    a complex digital synthesizer which releases a reference carrier frequency signal in accordance with the command from said system interface;

    an RF envelope mixer which combines the reference carrier frequency signal and an RF envelope waveform signal and releases a resulting reference RF pulse signal in the complex form;

    a digital frequency up-converter which up-converts the carrier frequency of the reference RF pulse signal to a resonant frequency necessary at an intended static magnetic field strength and converts the resulting signal into an analog RF pulse signal; and

    an analog rousing circuit which filters out alias harmonics emerging in the analog RF pulse signal and adjusts the amplitude of the resulting signal.

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