Patent ID: 7254216
Filing Date: 2007-08-07
Classification: A61B,G21K

Abstract:
1. A filter assembly for a computed tomographic imaging system comprising: first and second endplates at opposite ends of the filter assembly; a first moveable subassembly comprising at least a first x-ray filter and configured to move between said first and second endplates along a z-axis perpendicular to said first endplate; a second moveable subassembly comprising at least a second x-ray filter and configured to move between said first and second endplates along the z-axis perpendicular to said second endplate; and wherein said first moveable subassembly and said second moveable subassembly are independently movable along the z-axis to provide at least a small bowtie x-ray filter, a large bowtie x-ray filter, a medium bowtie x-ray filter, a flat filter, and a closed position for a radiation source positioned in a fixed position relative to said filter assembly, wherein the z-axis is parallel to a rotational axis of the computed tomographic imaging system.