Tomosynthesis Projection Image Enhancement via Pixel Accumulation
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Solution Overview
Problem
Tomosynthesis imaging systems face challenges with noise contamination and the need for reduced radiation exposure, as single projection images are noisy due to low dose per projection, and there is a requirement for high-quality diagnostic images comparable to 2D mammograms.
Innovation Solution
A method that enhances 2D tomosynthesis projection images by accumulating and ranking pixel values across multiple orientations, combining them to determine the most likely height for each pixel, and reducing artifacts through filtering, allowing for improved image quality and reduced radiation dose by generating enhanced 2D images without additional X-ray exposures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single tomosynthesis projection image is acquired at low dose, then radiation exposure is reduced, but image quality deteriorates due to noise contamination
Solution Approach 1:
The patent combines multiple low-dose projection images acquired at different angles to generate an enhanced 2D projection image. By merging the information from multiple projections through accumulation and ranking algorithms, the system achieves image quality comparable to high-dose single images while distributing the radiation dose across multiple lower-dose exposures, thereby reducing overall radiation exposure to the patient.
Solution Approach 2:
The patent introduces an image processing intermediary system that acts between the raw low-dose projections and the final diagnostic image. This intermediary applies accumulation algorithms, ranking operations, and filtering techniques to eliminate noise and enhance image quality, allowing the system to produce high-quality diagnostic images from low-dose input projections without requiring high-dose single images.
2Loss of information
If multiple 2D mammograms and tomosynthesis images are acquired separately, then comprehensive diagnostic information is obtained, but radiation exposure is doubled
Solution Approach 1:
The patent creates a multi-functional imaging system where a single tomosynthesis acquisition serves multiple purposes: it generates both 3D volume images for navigation and enhanced 2D projection images for diagnostic review. The enhanced 2D projections derived from the tomosynthesis data can replace separate 2D mammogram acquisitions, allowing the system to provide comprehensive diagnostic information (both 2D overview and 3D detail) from a single acquisition, thereby eliminating the need for dual acquisitions and reducing radiation exposure.
Solution Approach 2:
The patent transitions from separate 2D and 3D acquisitions to a unified 3D tomosynthesis acquisition that can generate both 2D-like overview images and 3D navigable images. By acquiring data in three dimensions and then rendering it in various formats (enhanced 2D projections and 3D volume images), the system obtains comprehensive diagnostic information in one acquisition rather than requiring separate 2D and 3D scans, thus reducing total radiation exposure.
3Measurement precision
If enhanced processing is applied to single projection images, then image quality improves, but processing complexity increases
Solution Approach 1:
The patent segments the image enhancement process into distinct computational stages: accumulation of projection values, ranking of accumulated values to determine most likely heights, and filtering to remove artifacts. This segmentation allows the complex enhancement task to be broken down into manageable algorithmic steps that can be efficiently implemented and optimized, reducing the practical processing complexity while maintaining high image quality output.
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 produces high-quality enhanced 2D images that resemble 2D mammograms, facilitating lesion identification and reducing radiation dose, while enabling efficient data and workflow management by providing improved image quality and 3D rendering capabilities.
Implementation Method 1
X-ray imaging systems have become a valuable tool in medical applications
Data Source
AI summary
A method and system for obtaining images of an object of interest using a system comprising an X-ray source facing a detector. The method and system enable the acquiring of a plurality of 2D projection images of the object of interest in a plurality of orientations. A selected 2D projection image such as the zero projection of the plurality of projections can be enhanced by using at least a subset of the plurality of tomosynthesis projection images. The obtained enhanced 2D projection image is displayed for review.