Brain Tissue Phantom Using Glass Micro Bubbles for CT Calibration
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Solution Overview
Problem
Existing brain tissue phantoms are not accurate in representing the radiographic properties of brain tissue over a wide range of X-ray energies, particularly at low doses and multiple energy CT imaging, and struggle to minimize compositional differences with actual brain tissue while maintaining a solid and usable form at standard conditions.
Innovation Solution
A brain tissue equivalent phantom composition is developed with specific concentrations of hydrogen, carbon, nitrogen, oxygen, and additional elements like chlorine, calcium, silicon, glass micro bubbles, Araldite, Jeffamine, CaCO3, MgO, and Polyethylene, which mimics the radiographic properties of brain tissue across a wide range of X-ray energies, including low energies, by adjusting the ratios of Araldite to Jeffamine and incorporating acrylic microspheres and glass micro bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional epoxy, acrylic, or polyethylene base materials are used for brain phantoms, then the material can be constructed as a solid phantom at standard temperature and pressure, but the radiographic accuracy across a wide range of X-ray energies is insufficient
Solution Approach 1:
The patent uses a composite material system combining epoxy resin base with multiple additives including acrylic microspheres (3-7% w/w), glass micro bubbles (1-4% w/w), and inorganic compounds (CaCO3, MgO, SiO2). This composite structure enables the phantom to accurately represent brain tissue radiographic properties across a wide energy range from 10-140 keV, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent systematically adjusts multiple material parameters including the ratio of Araldite to Jeffamine (10:4 to 1:1), concentrations of various additives, and elemental composition to achieve optimal radiographic properties. By changing these parameters, the phantom achieves accurate representation of brain tissue across different X-ray energies while maintaining solid form at standard conditions.
2Measurement precision
If the elemental composition is adjusted to match brain tissue more closely, then the radiographic properties improve, but the material becomes increasingly difficult to maintain as a solid usable phantom
Solution Approach 1:
The patent applies local quality by distributing different functional components throughout the material matrix. Acrylic microspheres and glass micro bubbles are dispersed within the epoxy base to provide localized radiographic properties, while the Araldite/Jeffamine matrix provides structural integrity. This allows the material to achieve both compositional accuracy and usability as a solid phantom.
Solution Approach 2:
The inclusion of glass micro bubbles (1-4% w/w) creates a porous structure within the phantom material. This porous architecture helps achieve the target density and radiographic properties while maintaining the material's solid form and usability. The controlled porosity allows the phantom to closely resemble brain tissue properties without compromising structural integrity.
3Reliability
If low dose CT imaging and multiple energy CT imaging are performed, then diagnostic capability improves, but the requirement for accurate brain tissue phantom representation across wide energy ranges becomes more critical
Solution Approach 1:
The patent creates a universal phantom material that functions accurately across multiple imaging modalities and energy ranges. The composite formulation with epoxy resin, acrylic microspheres, glass micro bubbles, and inorganic additives enables the phantom to represent brain tissue properties for both low-dose CT and multiple energy CT imaging, as well as traditional imaging, making it a multi-functional calibration standard.
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 phantom provides a highly accurate representation of radiographic attenuation, matching the spectral curve of human brain tissue within ±5 Hounsfield Units across 10-140 keV, and is verified to be equivalent to average brain tissue in physical and electron density, improving CT calibration and quality assurance.
Implementation Method 1
the phantom provides a highly accurate representation of radiographic attenuation, matching the spectral curve of human brain tissue within ±5 Hounsfield Units across 10-140 keV
Implementation Method 2
the composition includes 1-4% glass micro bubbles (w/w) and 3-7% acrylic microspheres (w/w)
Data Source
AI summary
Compositions, including composition for use in radiographic calibration and quality assurance include glass micro bubbles, epoxy, CaCo3, MgO, and Polyethylene. Embodiments of the composition may be used in calibration devices or phantoms. Calibration devices or phantoms constructed of embodiments of the composition may be used in methods of calibrating a radiographic device for imaging of brain tissue.