Portable Radiation Detector Layout to Prevent Load-Induced Image Unevenness
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Solution Overview
Problem
Portable radiation imaging apparatuses, such as Flat Panel Detectors (FPDs), face image unevenness due to bending when subjected to heavy loads, particularly when a patient's weight is applied during imaging.
Innovation Solution
The radiation detector is configured with a flexible substrate and a semiconductor element on its surface, housed within a case where the battery is positioned centrally to support the detector, distributing the load and reducing bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a flexible substrate is used to reduce weight, then the weight of the radiation detector is decreased, but the substrate easily bends under load causing image unevenness
Solution Approach 1:
The patent employs a composite structure combining flexible substrate with rigid support elements (frame and battery) to achieve both weight reduction and bending prevention. The flexible substrate is integrated with a rigid frame that provides structural support, creating a composite system that maintains image uniformity while keeping overall weight low.
Solution Approach 2:
The battery is strategically positioned to function as a counterweight that applies upward force to counteract the downward load from the patient's weight during imaging. This counterbalancing mechanism prevents the flexible substrate from bending excessively, thereby maintaining image quality while allowing the use of lightweight materials.
2Manufacturing precision
If a glass substrate is used to prevent bending, then image uniformity is maintained, but the weight of the radiation detector increases
Solution Approach 1:
The radiation detector is segmented into multiple functional components: a flexible substrate for radiation detection, a rigid frame for structural support, and a battery for counterbalancing. This segmentation allows each component to be optimized independently - the substrate remains lightweight and flexible while the frame provides necessary rigidity without requiring the entire detector to be made of heavy glass.
Solution Approach 2:
The patent changes the structural parameters of the detector by introducing a frame structure and counterbalancing mechanism, allowing the substrate to be flexible rather than rigid. This parameter change enables the use of lighter materials while maintaining image uniformity through the combined structural system.
3Manufacturing precision
If the battery is positioned centrally to support the detector, then the load is distributed and bending is reduced, but the device complexity increases
Solution Approach 1:
The centrally positioned battery serves multiple functions: it provides power to the detector, acts as a counterweight to balance the load, and serves as a structural support element. This multi-functionality reduces the need for separate support structures, thereby limiting the increase in device complexity while achieving load distribution and bending prevention.
Data Source
AI summary
A radiation imaging apparatus that images a radiation image includes a radiation detector that includes a substrate and a semiconductor element that is formed on an imaged surface of the substrate; a supporter that supports the radiation detector, a battery that supplies power to the radiation imaging apparatus through a terminal; a case that includes a front surface portion facing the imaging surface of the radiation detector and a rear surface portion facing the front surface portion with the radiation detector in between; and a connector that is provided on a lateral surface of the case and that communicates with an external device. The battery is provided so that the terminal thereof projects in a direction perpendicular to the side of the case where the connector is provided.