Patent ID: 7592602

Claim:
A radiation source locator, comprising: a first coded-aperture mask and a second coded-aperture mask located in a spaced apart relationship, wherein said second coded-aperture mask is the inverse of said first coded-aperture mask; a first detector plane located between said first coded-aperture mask and said second coded-aperture mask; a third coded-aperture mask and a fourth coded-aperture mask located in a spaced apart relationship, wherein said third coded-aperture mask is the inverse of said fourth coded-aperture mask and said first coded-aperture mask, wherein fourth coded-aperture mask is the inverse of said second coded-aperture mask and said third coded-aperture mask; and a second detector plane located between said third coded-aperture mask and said fourth coded-aperture mask, wherein said third coded-aperture mask and said fourth coded-aperture mask and said second detector plane are all located at a common end of said first coded-aperture mask and said second coded-aperture mask and said first detector plane.