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Ultrahigh resolution interferometric x-ray imaging

  • US 5,812,629 A
  • Filed: 04/30/1997
  • Issued: 09/22/1998
  • Est. Priority Date: 04/30/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for producing an image that describes the internal structure of an object, comprisinga source of x-rays,an x-ray image detector;

  • improved by its further comprisingthree very-thin slab-shaped volumes, SV1, SV2, and SV3, each with substantially-planar slab faces oriented relative to each other to be substantially-mutually-parallel, and each containing an associated very-thin material structure that interacts with x-rays, andmeans for limiting the energy-bandwidth of detected x-rays;

    wherein said three contained structures are positioned between said source and said detector so that x-rays from said source propagate in the sequential order, first through said structure within slab-volume SV1, next through said structure within slab-volume SV2, next through said object, next into slab-volume SV3, and then are detected; and

    wherein the directions x and y are both parallel to the substantially-parallel faces of said three slab-volumes; and

    wherein said material structures within slab-volumes SV1, and SV2 are fabricated to be spatially-periodic within their associated useful x-direction widths, respectively with associated spatial periods a1x and a2x, and oriented within the apparatus so that each structure'"'"'s respective periodicity-direction that is associated with said respective period lies in the direction x; and

    wherein the perpendicular distance between slab-volume SV1 and slab-volume SV2 is R1 and the perpendicular distance between slab-volume SV2 and slab-volume SV3 is R2 ; and

    wherein b, q, and p are positive integers; and

    wherein a1x is accurately related to a2x by
    
    
    space="preserve" listing-type="equation">a.sub.1x =b a.sub.2x (R.sub.1 +R.sub.2)(q p R.sub.2).sup.-1 ;

    andwherein, when said object is absent, and for x-rays with at least one specific energy value that lies within said energy-bandwidth, and throughout the associated useful x-direction width of said material structure within slab-volume SV3, then the two structures respectively within slab-volumes SV1 and SV2 acting together but not separately project onto slab-volume SV3 an x-ray intensity distribution that is substantially spatially-periodic in direction x with the spatial period aPx and has a substantial spatial intensity variation; and

    wherein when the greatest common integer divisor of b and q is 1, then the period aPx is accurately related to a2x by
    
    
    space="preserve" listing-type="equation">a.sub.Px =a.sub.2x (R.sub.1 +R.sub.2)(q p R.sub.1).sup.-1.

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