Mammography Detector with Detachable Frame Edge
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Solution Overview
Problem
In mammography digital detectors, the protruding edge portion of the laminar components necessary for adhesive collection displaces the active area from the chest wall, reducing the detector's effectiveness and complicating economic manufacturing.
Innovation Solution
A detachable protruding edge portion on the main frame is provided, which can be snapped off along a pre-scribed line to align the detector stack's edge with the base frame, allowing for a thinner cover to minimize the distance between the active area and the chest wall, facilitating closer contact and easier handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large distance is maintained between the detector and the patient's chest, then the patient receives less electromagnetic radiation exposure, but the image quality deteriorates due to increased scattering and reduced signal strength
Solution Approach 1:
A compression plate is introduced as an intermediary component between the detector and the patient's chest. The compression plate serves multiple functions: it maintains optimal detector-to-chest distance for image quality while limiting excessive radiation exposure, provides mechanical compression to flatten the breast tissue for better contact, and distributes the compression force evenly. This mediator resolves the contradiction by decoupling the direct contact requirement for image quality from the radiation exposure control requirement.
Solution Approach 2:
The compression plate's thickness and material density are specifically designed to optimize the detector-to-chest distance parameter. By controlling this distance parameter within an optimal range, the system achieves both adequate image quality (sufficient signal strength) and reduced radiation exposure (inverse square law effect). The parameter optimization resolves the contradiction between proximity for image quality and distance for radiation protection.
2Device complexity
If a large distance is maintained between the detector and the patient's chest, then the detector structure can be simplified, but the detection sensitivity decreases due to signal attenuation
Solution Approach 1:
The compression plate acts as a mechanical intermediary that enables detector positioning at an optimized distance. This allows the detector to maintain sufficient proximity for high detection sensitivity while preventing excessive closeness that would require complex shielding and safety mechanisms. The compression plate simplifies the overall system structure by providing a straightforward mechanical solution for distance control.
Solution Approach 2:
The compression plate provides dynamic adjustment capability, allowing the detector-to-chest distance to be optimized for each patient and imaging condition. This dynamic positioning capability ensures consistent detection sensitivity across varying patient anatomies while maintaining a simplified detector structure without requiring active positioning mechanisms.
3Measurement precision
If the detector is positioned closer to the patient's chest, then image quality improves due to reduced scattering, but the patient receives higher electromagnetic radiation exposure
Solution Approach 1:
The compression plate serves as a protective intermediary that enables close detector-to-chest positioning for optimal image quality while simultaneously limiting radiation exposure. The plate's material composition and thickness are designed to attenuate excess radiation, allowing the detector to be positioned at the optimal distance for image quality without proportionally increasing patient exposure.
Solution Approach 2:
By optimizing the detector-to-chest distance parameter within a controlled range (using the compression plate to maintain this distance), the system achieves the best compromise between image quality (improves with closer distance) and radiation exposure (increases with closer distance). The parameter optimization resolves the direct trade-off between these two opposing requirements.
4Reliability
If the detector is positioned closer to the patient's chest, then detection sensitivity increases, but the detector requires more complex shielding and safety mechanisms
Solution Approach 1:
The compression plate serves as a passive intermediary that provides radiation attenuation and mechanical support, allowing the detector to be positioned closer to the patient for improved sensitivity without requiring the detector itself to incorporate complex active shielding mechanisms. The shielding function is distributed to the compression plate, simplifying the detector design.
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 solution ensures the active area of the detector is closer to the chest wall, enhancing reading effectiveness and enabling more economical manufacturing by allowing for precise alignment and protection during handling.
Implementation Method 1
an anode for generating electromagnetic radiation and a cathode opposite the anode, the cathode configured to image the object
Data Source
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Figure 3~4
Figure 5
AI summary
An X-ray detector is manufactured bonding detector layers onto a main frame leaving a protruding edge portion extending beyond edge of the detector layers. The protruding edge portion of the main frame is then detached from the main frame along a detachment line adjacent the edge of the detector layers before a cover with a thin edge wall is applied to the detector stack.