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Adaptive NMR angiographic reprojection method

  • US 5,204,627 A
  • Filed: 03/14/1991
  • Issued: 04/20/1993
  • Est. Priority Date: 03/14/1991
  • Status: Expired due to Fees
First Claim
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1. A method for producing a magnetic resonance angiogram, the steps comprising:

  • acquiring a 3D NMR data set comprised of a set of values which indicates by their magnitude the translational movement of spins and which indicates by their location in the 3D NMR data set the physical location of said spins;

    producing a binary mask having a set of binary values in which there is a binary value corresponding to each value in the 3D NMR data set and the binary values are determined by a) locating regions in the 3D NMR data set in which the magnitude of its values exceed a first threshold value, b) enlarging those regions and c) setting the binary values in the binary mask which correspond to said enlarged regions to one of their binary values;

    combining the 3D NMR data set with the binary mask to produce a 3D adapted data set in which values in the 3D NMR data set which correspond to binary values in the binary mask located outside the enlarged regions are removed from the 3D NMR data set; and

    producing a 2D magnetic resonance angiogram from the 3D adapted data set in which a brightness value of each pixel in the 2D magnetic resonance angiogram is determined by the sum of all the data points therein that are disposed along the pixel'"'"'s projection ray.

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