Radiography System Bone Density Correction
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Solution Overview
Problem
Existing radiography techniques fail to accurately derive bone density and bone mineral content due to the influence of body thickness on radiation absorption, leading to varying results even for subjects with the same bone mineral content and density.
Innovation Solution
A radiography system with two-dimensionally arranged pixels in radiation detectors, including a correction unit that adjusts pixel values based on body thickness, and a derivation unit that calculates bone density or mineral content by correcting pixel value ratios between soft and bone tissue regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiographic images are generated by irradiating radiation detectors with radiations having different energy levels, then bone mineral content and bone density can be derived, but the accuracy of derived values varies depending on body thickness of the subject
Solution Approach 1:
The patent applies parameter changes by introducing body thickness as a correction parameter. The correction unit modifies pixel values based on the detected body thickness, adjusting the radiographic images to compensate for varying radiation absorption. This allows accurate bone mineral content and density derivation across different body thicknesses by dynamically changing the processing parameters according to the subject's characteristics.
Solution Approach 2:
The system implements feedback by using the detected body thickness information to adjust subsequent image processing. The correction unit receives body thickness data and feeds this back into the pixel value correction process, creating a closed-loop system that continuously optimizes measurement accuracy based on the actual subject characteristics.
2Device complexity
If body thickness is not considered in radiographic image processing, then the processing is simpler, but different values are derived for bone mineral content and bone density even when they are the same
Solution Approach 1:
The patent applies preliminary action by detecting and storing body thickness information before the final bone density calculation. The correction unit prepares corrected radiographic images in advance based on body thickness, so that when bone mineral content and density are derived, the measurements are already adjusted for accuracy. This preliminary preparation maintains processing efficiency while ensuring measurement precision.
3Measurement precision
If correction data based on body thickness is applied to pixel values, then accurate bone density and mineral content can be derived, but additional processing steps are required
Solution Approach 1:
The patent merges the body thickness detection and image correction processes into an integrated workflow. The correction unit combines multiple operations (body thickness-based pixel value adjustment, soft tissue region identification, and bone region analysis) into a unified processing sequence. This merging reduces the overall processing steps while maintaining measurement accuracy, thereby improving productivity without sacrificing precision.
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 allows for accurate derivation of bone density and mineral content by accounting for body thickness, improving the precision of radiographic measurements and reducing errors caused by varying radiation absorption.
Implementation Method 1
a conversion element that generates a larger amount of charge as it is irradiated with a larger amount of radiation
Implementation Method 2
a scintillator that absorbs the radiation and emits light
Data Source
AI summary
A radiography system includes a radiography apparatus including two radiation detectors and a console that corrects a ratio of pixel values in a region, which corresponds to a soft tissue of a subject and is a corresponding region of radiographic images generated by the two radiation detectors irradiated with radiations having different energy levels, on the basis of correction data corresponding to a body thickness, and derives the bone density of the subject on the basis of a difference between a ratio of pixel values in a region corresponding to a bone tissue of the subject and the corrected ratio of the pixel values.