X-Ray Reduction System

摘要

This invention relates to a multiple frame imaging system including radiation source, a detector having an input area, a monitor configured to display detected images, means for determining at least one Region of Interest (ROI) of an object on the displayed image, and a collimator having means for projecting the at least one region of interest (ROI) on at least one selected fraction of the input area exposed by the x-ray source. The collimator including at least three essentially non-overlapping plates mounted in a plane generally parallel to the detector input surface plane, each plate includes a first edge in contact with an edge of a first neighboring plate and a second edge adjacent to the first edge in contact with an edge of a second neighboring plate; and means for moving each one of the plates.

主权项

1. A collimator said collimator comprising:
at least three plates adapted to be mounted generally parallel to a detector input surface plane, said at least three plates forming a fully transparent gap therebetween, wherein each plate comprises a first edge forming a side of the gap and a second edge adjacent said first edge in contact with the first edge of a neighboring plate; each plate may be defined as a first plate, said first plate is configured to move in a first direction relative to said first plate's first edge and a neighboring plate to said first plate is configured to move in a second direction relative to said neighboring plate's first edge, said first direction relative to said first plate's first edge is different from said second direction relative to said neighboring plate's first edge; at least two plates are arranged so that there is a contour on an image connecting a first point at a first filter area of the image and a second point at a second filter area of the image; and wherein filtering of rays along the contour is essentially uniform.