Bone Lead XRF Measurement With Soft-Tissue Thickness Correction
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Solution Overview
Problem
Existing bone lead measurement systems face challenges with inefficiency, high cost, regulatory hurdles, and difficulty in correcting for soft-tissue thickness, limiting their widespread use and accuracy.
Innovation Solution
A metallic bone measurement system using XRF technology with a backscatter geometry greater than ninety degrees, combined with Compton scattering normalization and error propagation equations, to accurately quantify bone lead density while correcting for soft-tissue thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional KXRF measurement systems are used, then bone lead measurement is achieved, but the measurement time is excessively long (30 minutes)
Solution Approach 1:
The patent changes the measurement parameters by using L-shell fluorescence instead of K-shell, and employs a backscatter geometry with greater than 90 degrees instead of the traditional 90-degree geometry. These parameter changes enable faster measurements (under 5 minutes) while maintaining accuracy by using Compton scattering normalization to correct for soft tissue variations.
2Productivity
If L-shell measurement technique is used, then measurement time is reduced, but soft-tissue thickness correction becomes difficult and impacts detection capabilities
Solution Approach 1:
The patent introduces Compton scattering as an intermediary measurement that provides information about soft tissue thickness and composition. By measuring the Compton scattered radiation alongside the L-shell fluorescence, the system can normalize and correct for soft tissue variations, thereby maintaining detection capability while using the faster L-shell technique.
Solution Approach 2:
The system uses Compton scattering measurements to provide feedback about soft tissue conditions, which then feeds into the normalization process to correct the L-shell fluorescence measurements. This feedback loop ensures accurate bone lead quantification despite variations in soft tissue thickness.
3Measurement precision
If KXRF systems with germanium detectors are used, then measurement accuracy is achieved, but the system becomes cumbersome and requires liquid nitrogen cooling
Solution Approach 1:
The patent replaces the expensive, complex germanium detectors that require liquid nitrogen cooling with more practical detectors that can operate at room temperature. While the detectors have different characteristics, the overall system becomes more portable and easier to operate by eliminating the liquid nitrogen dewar and associated cooling infrastructure.
Solution Approach 2:
The patent replaces the mechanical cooling system (liquid nitrogen dewar) with an electronic or passive cooling approach that allows the detector to operate without external cooling. This substitution eliminates the cumbersome cooling infrastructure while maintaining sufficient detection accuracy for bone lead measurement.
4Measurement precision
If KXRF systems are deployed, then bone lead measurement is achieved, but regulatory hurdles and radioisotope restrictions limit widespread use
Solution Approach 1:
The patent extracts the radioisotope source from the measurement system and replaces it with an x-ray tube that generates x-rays electrically. This extraction eliminates the need for licensed radioisotopes and the associated regulatory burden, making the system easier to manufacture and deploy without special nuclear regulatory approvals.
Solution Approach 2:
The patent creates a functional copy of the KXRF measurement capability using different physical means. Instead of using a radioisotope source that emits x-rays, the system uses an electrically-powered x-ray tube to generate the necessary x-ray fluorescence, achieving the same measurement goal without the regulatory constraints of radioisotope use.
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
The system provides efficient, accurate, and portable bone lead measurements in under five minutes, reducing radiation exposure and overcoming soft-tissue correction challenges, making it suitable for widespread use.
Implementation Method 1
an x-ray fluorescence (XRF) device... The x-ray source may be configured to produce an x-ray beam
Implementation Method 2
calibrate the XRF device, using a Compton scattering normalization method
Data Source
AI summary
The bone measurement system is configured to detect a density of a metallic source within a bone. The bone measurement system includes an x-ray fluorescence (XRF) device, a filter, a radiation detector, a non-transitory computer-readable storage medium storing processor-executable instructions, and a processor. The XRF device may have an x-ray tube including an x-ray source and an anode. The x-ray source may be configured to produce an x-ray beam. The x-ray tube may include a backscatter geometry of around less than one-hundred and eighty degrees to more than ninety degrees. The filter may be disposed along a path of the x-ray beam. The radiation detector may be coupled to the XRF device.