US 11,808,902 B2
Imaging system with one or more mask units and corresponding method of recording radiation
Steven Brown, Ann Arbor, MI (US); and Kevin Moran, South Lyon, MI (US)
Filed by H3D, Inc., Ann Arbor, MI (US)
Filed on Feb. 10, 2021, as Appl. No. 17/172,983.
Application 17/172,983 is a continuation of application No. 16/177,769, filed on Nov. 1, 2018, granted, now 10,948,614.
Prior Publication US 2021/0165117 A1, Jun. 3, 2021
Int. Cl. G01T 1/29 (2006.01); G03F 7/20 (2006.01); G03F 7/00 (2006.01)
CPC G01T 1/295 (2013.01) [G03F 7/70775 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An imaging system comprising:
a first mask unit having a surface and a hollow cavity surrounding a rotational axis;
wherein the first mask unit is characterized by a first pattern encoded on the surface, the first pattern defining a height along an axial direction parallel to the rotational axis;
wherein the first pattern includes a respective plurality of elements with one or more open elements in each of the axial direction and a circumferential direction and one or more blocking elements in each of the axial direction and the circumferential direction;
a detector configured to receive radiation data from at least one source such that one of the detector and the at least one source is located inside the hollow cavity and another of the detector and the at least one source is located outside the hollow cavity;
wherein the first pattern includes a first set and a second set, the first pattern being characterized by a base set such that the first set and the second set each include a respective portion of the base set; and
wherein the first mask unit is configured to move relative to the rotational axis in both the axial direction and the circumferential direction until the first pattern is fully recorded by the detector.