Neural Network Bone Density Estimation from Plain X-Rays
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Solution Overview
Problem
Existing technologies lack efficient and cost-effective methods for estimating bone density using readily available imaging data, such as plain X-ray images, without the need for expensive equipment like DEXA apparatuses.
Innovation Solution
A neural network-based estimation apparatus that utilizes learned parameters to estimate bone density from plain X-ray images, including convolutional layers and pooling layers, allowing for bone density estimation using image data from various body parts and orientations, even when the imaging parts and exposure directions differ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DEXA apparatuses are used for bone density estimation, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a virtual copy of the DEXA measurement capability by training a neural network on DEXA image data. The trained model then processes plain X-ray images to estimate bone density, effectively copying the estimation capability without requiring actual DEXA hardware. This resolves the contradiction by achieving similar measurement precision through software-based simulation rather than expensive specialized equipment.
Solution Approach 2:
The patent replaces expensive, complex DEXA apparatuses with a computationally efficient neural network model that can be deployed on standard computing infrastructure. The model processes images quickly and can be updated or replaced without hardware changes, embodying the principle of using cheaper, more flexible computational resources instead of expensive physical equipment.
2Measurement precision
If DEXA apparatuses are used for bone density estimation, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent creates a virtual copy of the DEXA measurement capability by training a neural network on DEXA image data. The trained model then processes plain X-ray images to estimate bone density, effectively copying the estimation capability without requiring actual DEXA hardware. This resolves the contradiction by achieving similar measurement precision through software-based simulation rather than expensive specialized equipment.
Solution Approach 2:
The patent replaces expensive, complex DEXA apparatuses with a computationally efficient neural network model that can be deployed on standard computing infrastructure. The model processes images quickly and can be updated or replaced without hardware changes, embodying the principle of using cheaper, more flexible computational resources instead of expensive physical equipment.
3Ease of operation
If plain X-ray images are used for bone density estimation, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent introduces a neural network model as an intermediary between plain X-ray images and bone density estimation. The model learns the complex mapping relationship from X-ray image features to bone density values, acting as a mediator that translates readily available X-ray data into accurate bone density estimates. This resolves the contradiction by bridging the gap between simple input data and precise output measurements through intelligent intermediate processing.
Solution Approach 2:
The patent transforms the estimation approach by changing from direct measurement (which requires DEXA) to indirect estimation through learned parameters. The neural network learns optimal parameters and features from training data that correlate with bone density, enabling accurate estimation from plain X-rays. This parameter transformation resolves the contradiction by finding alternative measurement pathways that maintain precision while improving accessibility.
4Adaptability or versatility
If image data from various body parts and orientations are used, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal neural network model that can process X-ray images from multiple body parts and orientations using the same architecture and processing pipeline. The model is trained on diverse data including lateral and PA views of vertebrae, enabling it to handle various imaging scenarios without requiring separate specialized models. This resolves the contradiction by achieving broad adaptability through a single multi-functional system rather than multiple specialized devices.
Solution Approach 2:
The patent employs segmentation within the neural network to identify and process different vertebral bodies and their components (cortical and cancellous bone regions) independently. This segmentation approach allows the model to handle variations in orientation and body part while maintaining consistent estimation accuracy, resolving the contradiction by breaking down complex varied inputs into manageable standardized processing units.
Data Source
AI summary
An estimation apparatus includes an input unit and an approximator. Input information including an image in which a bone appears is input into the input unit. The approximator is configured to determine an estimation result related to bone density of the bone from the input information. The approximator includes a learned parameter to obtain the estimation result.


