Dynamic Breast Compression for Mammography X-Ray Path Control
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Solution Overview
Problem
Conventional mammography techniques face challenges in differentiating malignant tissue from benign tissue due to reduced depth resolution in three-dimensional image reconstruction, primarily because x-ray images are acquired from a limited angle range, leading to incomplete scanning and increased scatter radiation.
Innovation Solution
A mammography apparatus that adjusts the compression of the breast based on its size and density, allowing the x-ray source to move on an arc-shaped trajectory, minimizing the x-ray path length and enabling a larger selectable angle range for improved depth resolution and reduced scatter radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the x-ray source moves along a fixed arc-shaped trajectory with constant compression, then the imaging process is simple, but the x-ray path length varies and scatter radiation increases
Solution Approach 1:
The compression force is made dynamic and adjustable during the x-ray acquisition process. The system automatically adjusts the compression level based on the x-ray source position and breast characteristics to maintain optimal x-ray path length, thereby reducing scatter radiation while preserving imaging simplicity through automated control
Solution Approach 2:
The system changes the compression parameter dynamically during the imaging process. By adjusting the compression level according to the x-ray trajectory position and breast density/size characteristics, the system maintains consistent x-ray path lengths and minimizes scatter radiation without complicating the overall imaging procedure
2Object-affected harmful factors
If the compression is reduced to minimize x-ray path length, then scatter radiation decreases, but the breast may not be sufficiently compressed for optimal imaging
Solution Approach 1:
The system incorporates feedback mechanisms that continuously monitor breast compression levels and adjust the compression force in real-time. This ensures that sufficient compression is maintained for optimal imaging while automatically reducing compression when the x-ray source position indicates shorter path lengths are needed, thereby minimizing scatter radiation
Solution Approach 2:
The compression force transitions from a static fixed value to a dynamic adjustable parameter. The system dynamically adjusts compression levels based on real-time feedback from breast characteristics and x-ray source position, achieving both adequate compression for imaging and minimal scatter radiation through optimized path length
3Measurement precision
If a larger angle range is used for x-ray acquisition, then depth resolution improves, but the x-ray path length increases and scatter radiation increases
Solution Approach 1:
The system changes the compression parameter dynamically during the imaging process. By adjusting the compression level according to the x-ray trajectory position and breast density/size characteristics, the system maintains consistent x-ray path lengths and minimizes scatter radiation without complicating the overall imaging procedure
Solution Approach 2:
The compression force is made dynamic and adjustable during the x-ray acquisition process. The system automatically adjusts the compression level based on the x-ray source position and breast characteristics to maintain optimal x-ray path length, thereby reducing scatter radiation while preserving imaging simplicity through automated control
4Productivity
If the x-ray source is deflected at larger angles, then more projection acquisitions are obtained, but the path length through the breast increases
Solution Approach 1:
The compression force is made dynamic and adjustable during the x-ray acquisition process. The system automatically adjusts the compression level based on the x-ray source position and breast characteristics to maintain optimal x-ray path length, thereby reducing scatter radiation while preserving imaging simplicity through automated control
Solution Approach 2:
The system changes the compression parameter dynamically during the imaging process. By adjusting the compression level according to the x-ray trajectory position and breast density/size characteristics, the system maintains consistent x-ray path lengths and minimizes scatter radiation without complicating the overall imaging procedure
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
This approach enhances the depth resolution of 3D x-ray images, allowing better depiction of malignant tissue and micro-calcifications by maintaining consistent x-ray path lengths and reducing scatter radiation across different angles, thereby improving image quality.
Implementation Method 1
a mammography apparatus (100) with a compression unit (KE), wherein a deflection of the x-ray source (RQ), aligned on a radiation detector (D), is predetermined depending on the size of the breast (B) that is compressed in the compression unit (KE)
Implementation Method 2
a compression unit (KE), wherein a deflection of the x-ray source (RQ), aligned on a radiation detector (D), is predetermined depending on the size of the breast (B) that is compressed in the compression unit (KE)
Implementation Method 3
The invention has the advantage that the scatter radiation during an x-ray acquisition is reduced.
Data Source
AI summary
In a mammography apparatus, a deflection of an x-ray source aligned on a radiation detector is predetermined depending on the size of a breast compressed in the compression unit and/or the density of the breast tissue. Given an increasing deflection on an arc-shaped trajectory of the x-ray source, the compression of the breast is reduced at least once so that the path of the x-rays through the breast stays within a predetermined path length, starting from a first compression in a first x-ray acquisition.