Dynamic Acquisition Parameter Adjustment in Breast Tomosynthesis
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Solution Overview
Problem
Current mammography systems face challenges in specificity due to their 2D representation of 3D breast structures, leading to difficulties in distinguishing between cancerous and benign lesions, especially with varying breast compositions and overlapping structures.
Innovation Solution
A method that dynamically varies image acquisition parameters in a breast x-ray tomosynthesis system based on physical characteristics of the breast, such as density and thickness, using a scout image to tailor parameters like gantry angular range, number of projections, and exposure time for improved image quality and reduced radiation dose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed scanning protocol is used for all breast sizes and compositions, then the system operation is simple, but the image quality and radiation dose optimization are compromised
Solution Approach 1:
The system performs a preliminary scout image acquisition before the main tomosynthesis scan. This preliminary action provides information about breast thickness and composition, which is then used to pre-determine optimized scanning parameters (angular range, number of projections, exposure time) tailored to the specific patient's breast characteristics, avoiding the need for complex real-time adjustments during the main scan
Solution Approach 2:
The system uses the scout image data as feedback to automatically adjust the tomosynthesis acquisition parameters. The measured breast thickness and composition from the scout image feed back into the control system, which then selects appropriate parameters from pre-defined protocols or dynamically adjusts them, creating a closed-loop system that adapts to individual patient needs
2Measurement precision
If the number of projection images is increased to improve reconstruction quality, then image quality improves, but radiation dose increases
Solution Approach 1:
The system dynamically adjusts the number of projection images acquired based on the specific breast composition and thickness measured from the scout image. For denser or thicker breasts that require higher reconstruction quality, more projections are acquired. For less dense breasts, fewer projections suffice, thereby optimizing the balance between image quality and radiation dose exposure for each individual patient
Solution Approach 2:
The system changes the acquisition parameters (number of projections, angular range, exposure time) as a function of the measured breast characteristics. By adjusting these parameters dynamically rather than using fixed values, the system achieves optimal reconstruction quality while minimizing radiation dose for each patient's specific breast composition
3Ease of operation
If breast compression is reduced to improve patient comfort, then patient comfort improves, but image quality deteriorates due to increased tissue overlap
Solution Approach 1:
The system transitions from 2D mammography to 3D tomosynthesis, adding the angular dimension to image acquisition. By acquiring images at multiple angles and reconstructing them into volumetric data, the system eliminates the tissue overlap problem that plagues 2D imaging. This allows for reduced breast compression while maintaining image quality, as the 3D reconstruction can separate overlapping structures along the depth dimension
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 image quality by customizing acquisition parameters for individual breast compositions, improving the ability to identify pathologies and reducing radiation exposure, thereby enhancing diagnostic accuracy and patient safety.
Implementation Method 1
acquiring a plurality of projection images of the breast tissue using the modified motion parameter, wherein the plurality of projection images comprises projection images being acquired as a series of images for tomosynthesis image acquisition, wherein each of the plurality of projection images of the breast is obtained using an x-ray source
Data Source
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AI summary
Systems and methods for automatically and dynamically modifying an image acquisition parameter for use in tomosynthesis breast imaging. A selected image acquisition parameter is modified in response to a measured characteristic of an imaged object such as a breast, and thus tailored to provide the highest quality image for the particular object. For example, image quality in a breast tomosynthesis system can be improved by dynamically varying motion and other acquisition parameters of the tomosynthesis system in response to physical characteristics of the breast to be imaged (determined during image acquisition), such as the breast thickness or density. The ability to dynamically vary acquisition or processing methods helps to customize the system for each particular patient, thereby improving image quality and identification and assessment of potential pathologies and abnormalities, and lower radiation dose, and thus a reduced the risk of long-term adverse health effects due to lifetime accumulated radiation dose.