Filtered Back-Projection Reconstruction for Tomosynthesis Artifact Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional digital tomosynthesis and CT reconstruction methods produce 3-D images with artifacts such as streaking and blurring, leading to loss of fine details and crisp visual distinctions in medical imaging.
Innovation Solution
A method involving pre-filtering and post-filtering of 2-D projection images, with optimized settings for emphasis on structures of interest, to enhance image details and maintain sharp visual distinctions during 3-D image reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional filtered back-projection methods are used for 3-D image reconstruction, then the contrast of structures of interest is enhanced, but artifacts such as streaking and blurring are generated and fine details are lost
Solution Approach 1:
The patent divides the filtering process into two distinct segments: pre-filtering applied to 2-D projection images before back-projection, and post-filtering applied to the reconstructed 3-D image. This segmentation allows each filtering stage to be optimized for its specific purpose - pre-filtering enhances contrast while post-filtering preserves fine details and reduces artifacts.
Solution Approach 2:
The patent applies pre-filtering as a preliminary action before the back-projection reconstruction process. This preliminary filtering of the projection data prepares the input by enhancing contrast and suppressing noise, which then propagates through the reconstruction to improve the overall image quality without generating artifacts.
2Productivity
If conventional filtered back-projection methods are used, then reconstruction speed is maintained, but aliasing artifacts and streaking are produced
Solution Approach 1:
The patent extracts and removes harmful artifacts from the reconstruction process by applying post-filtering specifically targeted at eliminating aliasing and streaking artifacts that are generated during back-projection. This extraction approach maintains the speed of conventional methods while selectively removing the harmful components.
3Device complexity
If conventional filtering is applied, then processing complexity is reduced, but fine details and crisp visual distinctions are lost
Solution Approach 1:
The patent applies different filtering characteristics to different stages of the process - pre-filtering uses settings optimized for contrast enhancement on projection data, while post-filtering uses settings optimized for detail preservation on reconstructed images. This local optimization of filtering quality at each stage maintains simplicity while preserving fine details.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method generates 3-D images with sharp visual distinctions and preserved details from 2-D images, effectively reducing artifacts and enhancing the clarity of structures of interest.
Implementation Method 1
A digital tomosynthesis system includes an X-Ray source and a 2-D X-Ray detector
Implementation Method 2
acquiring digital X-Ray data of a portion of the patient's body
Implementation Method 3
performing some filtration of image data before back-projection, and other filtration after back-projection
Data Source
AI summary
Systems, methods and apparatus are provided through which a specialized back-projection process reconstructs a finely detailed and crisp three-dimensional image (3-D) from a series of two-dimensional (2-D) images by pre-filtering the 2-D images with a first group of settings before back-projecting the 2-D images into a 3-D image, and then post-filtering the 3-D image with another group of settings. In some embodiments, the first group of settings and the second group of settings are synergistically optimized in relation to each other to provide emphasis on a structure of interest in the object.