Bone Mineral Density Estimation via Soft Tissue Attenuation Separation
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Solution Overview
Problem
Current methods for estimating bone mineral density, such as Dual X-ray absorptiometry, require patients to remain still for extended periods and necessitate trained operators and specialized equipment, limiting their effectiveness and accessibility.
Innovation Solution
A method involving three-dimensional geometrical representations of the skeleton and outline, combined with X-ray imaging from different angles, allows for the estimation of bone mineral density by calculating the thickness of soft and bone tissues and their respective attenuations, using software to separate the attenuation contributions from each tissue type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Dual X-ray absorptiometry is used to estimate bone mineral density, then measurement precision is improved, but device complexity and operator training requirements increase
Solution Approach 1:
The patent segments the X-ray attenuation measurement into separate components: bone tissue attenuation and soft tissue attenuation. By calculating the thickness of soft tissue through 3D geometrical representations and subtracting its attenuation contribution, the method isolates the bone mineral density signal from the total attenuation, enabling accurate measurement without complex dual-energy equipment.
Solution Approach 2:
The patent introduces 3D geometrical representations of the skeleton and soft tissue outline as intermediaries to calculate soft tissue thickness. This intermediary calculation allows the system to compensate for soft tissue attenuation effects, enabling accurate bone density measurement using simpler single-energy X-ray equipment rather than complex dual-energy systems.
2Measurement precision
If Dual X-ray absorptiometry is used to estimate bone mineral density, then measurement precision is improved, but ease of operation deteriorates due to strict movement constraints
Solution Approach 1:
The patent performs preliminary calculation of soft tissue thickness using 3D geometrical representations before the actual X-ray measurement. By pre-calculating the soft tissue attenuation contribution, the system can then measure bone density without requiring the patient to maintain extremely strict immobility during the measurement, as the soft tissue effects are already accounted for in the correction formula.
3Measurement precision
If X-rays are taken at different energy levels to separate tissue attenuation, then measurement precision is improved, but loss of time increases due to required pauses between energy levels
Solution Approach 1:
Instead of changing the energy level parameter of X-rays to separate tissue attenuation, the patent changes the geometric parameter by using 3D geometrical representations to calculate soft tissue thickness. This parameter substitution allows the system to achieve the same attenuation separation accuracy without the time delays inherent in dual-energy X-ray transitions, enabling faster and more efficient measurements.
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 enables accurate and efficient estimation of bone mineral density with reduced patient movement constraints and lower operator training requirements, improving the accessibility and accuracy of bone density assessments.
Implementation Method 1
detecting, for each of the energy levels, the extent to which the X-rays are attenuated by that person's tissues
Implementation Method 2
Analyzing the differential attenuation between tissues makes it possible to visualize the distribution per unit area, or 'areal' distribution, of bone mineral density
Data Source
AI summary
A method of estimating the distribution of bone mineral density in at least one portion of a person's skeleton. The method includes generating a geometrical representation of the portion of the skeleton; a geometrical representation in three dimensions of at least one portion of the outline of the person; and first and second X-ray images; and using software to estimate: a value for the thickness of soft tissue through which the given X-ray has passed; an attenuation coefficient of the soft tissues that have been passed through; a value for the thickness of bone tissue through which the given X-ray has passed; and using the thickness value for the soft tissue through which the given X-ray has passed, and a value for the attenuation of the given X-ray due to the thickness of the bone tissue through which it has passed, the software estimates a value representative of the bone mineral density of the bone tissues through which the given X-ray has passed.