Methods of Scatter Correction of X-Ray projection data 1
AssigneeVarian Medical Systems, Inc.
InventorsJosh Star-Lack, Mingshan Sun
Life of this patent
Estimating the term…
Abstract
A system and method for forming an adjusted estimate of scattered radiation in a radiographic projection of a target object, which incorporates scattered radiation from objects adjacent to the target object, such as a patient table. A piercing point equalization method is disclosed, and a refinement of analytical kernel methods which utilizes hybrid kernels is also disclosed.
Claims44
A method of forming an adjusted estimate of scattered radiation in an initial radiographic projection of a target object, comprising:
- forming a correction to a first estimate of scattered radiation in said initial radiographic projection of said target object by:
- a) generating at least two secondary radiographic projections of said target object;
- b) forming said first estimate of scattered radiation in each of said at least two secondary radiographic projections of said target object and applying said first estimate of scattered radiation in each of said at least two secondary radiographic projections of said target object to said at least two secondary radiographic projections of said target object to yield at least two corrected secondary radiographic projections of said target object;
- c) comparing said at least two said corrected secondary radiographic projections of said target object to detect an error in said first estimate of scattered radiation in said at least two secondary radiographic projections;
- and
- d) forming a correction module and applying said correction module to said first estimate of scattered radiation in said initial radiographic projection to form an adjusted estimate of scattered radiation in said initial radiographic projection, said correction module being derived from said comparing said at least two said corrected secondary radiographic projections.
A computer-readable medium configured to store instruction sets which, when executed by a processor of a computer system, cause the processor to estimate scattered radiation in a radiographic projection of a target object, the computer readable medium comprising:
- one or more instruction sets that directs the processor to perform the actions of:
- forming a correction to a first estimate of scattered radiation in said initial radiographic projection of said target object by:
- a) generating at least two secondary radiographic projections of said target object;
- b) forming a said first estimate of scattered radiation in each of said at least two secondary radiographic projections of said target object and applying said first estimate of scattered radiation in each of said at least two secondary radiographic projections of said target object to said at least two secondary radiographic projections of said target object to yield at least two corrected secondary radiographic projections of said target object;
- c) comparing said at least two said corrected secondary radiographic projections of said target object to detect an error in said first estimate of scattered radiation in said at least two secondary radiographic projections;
- and
- d) forming a correction module and applying said correction module to said first estimate of scattered radiation in said initial radiographic projection to form an adjusted estimate of scattered radiation in said initial radiographic projection, said correction module being derived from said comparing said at least two said corrected secondary radiographic projections.
Dependencies are inferred from the claim text.