Methods of scatter correction of x-ray projection data 2
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.
Claims46
A method of forming a total estimate of scattered radiation in a radiographic projection of a target object, said scattered radiation detected by a detector, said method comprising:
- a) generating at least one radiographic projection of said target object;
- b) forming a first scatter correction estimate of said radiographic projection, said first scatter correction estimate not including scatter from an adjacent object that is at least partially adjacent to said target object;
- c) separately forming a second scatter correction estimate of said radiographic projection, said second scatter correction estimate including scatter from said adjacent object;
- and
- d) generating said total estimate of scattered radiation by summing said first scatter correction estimate and said second scatter correction estimate.
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
- a) generating at least one radiographic projection of said target object;
- b) forming a first scatter correction estimate of said radiographic projection, said first scatter correction estimate not including scatter from an adjacent object that is at least partially adjacent to said target object;
- c) separately forming a second scatter correction estimate of said radiographic projection, said second scatter correction estimate including scatter from said adjacent object;
- and
- d) generating said total estimate of scattered radiation by summing said first scatter correction estimate and said second scatter correction estimate.
Dependencies are inferred from the claim text.