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Magnetic resonance imaging method, system and computer-readable storage medium

  • US 8,890,523 B2
  • Filed: 09/30/2011
  • Issued: 11/18/2014
  • Est. Priority Date: 09/30/2010
  • Status: Expired due to Fees
First Claim
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1. A method to acquire magnetic resonance image data from an examination subject located in a magnetic resonance data acquisition unit comprising an RF transmission system and multiple gradient coils, said method comprising:

  • acquiring magnetic resonance image data from the examination subject in the data acquisition unit by operating the data acquisition unit with a repeated pulse sequence in which RF excitation pulses are respectively radiated at a repetition time interval TR, with a magnetization vector of nuclear spins in the subject being placed in a steady state stable oscillation by said pulse sequence;

    in each repetition of said pulse sequence, activating at least one of said gradient coils to radiate a phase coding gradient that codes said magnetic resonance data in a k-space line of k-space, into which said magnetic resonance data are entered;

    operating said at least one of said gradient coils to emit said phase coding gradient with a first moment of said phase coding gradient that is minimal at a point in time coinciding with radiation of each RF excitation pulse without extending TR compared to pulse sequences having a non-minimized phase coding gradient; and

    operating said at least one of said gradient coils to emit said phase coding gradient, in a repetition of said pulse sequence in which said phase coding gradient codes an nth k-space line from a center of k-space, with a first moment that disappears at said point in time of radiation of said RF excitation pulse, wherein n is less than or equal to a threshold N that is dependent on TR to cause said phase coding gradient that codes said nth k-space line from the center of k-space to increase continuously with n at said point in time of radiation of said RF excitation pulse, when n is greater than N.

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