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MRI apparatus with flexible gradient control

  • US 20010024122A1
  • Filed: 12/18/2000
  • Published: 09/27/2001
  • Est. Priority Date: 12/20/1999
  • Status: Active Grant
First Claim
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1. A magnetic resonance apparatus which includes:

  • a gradient system (3, 7) for generating L gradient fields in a measuring volume (29) of the apparatus, which gradient system includes a number of N (N>

    L) mutually independent channels (3-i, 7-i), each of which consists of a gradient amplifier (7-i), with a signal input and an output and a gradient coil (3-i) connected to the output of the gradient amplifier, and a conversion unit (35) provided with N outputs which are connected to the N signal inputs of the N gradient amplifiers (3-i) in a one-to-one association, and provided with inputs, a number L of which is arranged to receive L gradient signals (Gi) representing the gradient fields to be generated, which conversion unit is arranged to convert, in conformity with a conversion algorithm stored in the conversion unit, at least the L gradient signals applied to the inputs into N control signals for controlling the N gradient amplifiers, characterized in that the conversion unit is provided with N inputs, the other N-L inputs of which are arranged to receive N-L other signals (λ

    i) which can be chosen independently of the gradient signals, and that the conversion unit is arranged to convert, in conformity with the conversion algorithm stored in the conversion unit and together with the L gradient signals (Gi) applied to the first L inputs, the N-L other signals (λ

    i) applied to the other N-L inputs into N control signals for controlling the N gradient amplifiers.

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