Polyamide Fiber-Resin Coils for PET/MRI Compatibility
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Solution Overview
Problem
Current combined PET/MRI systems face challenges in achieving high-quality examinations due to components like patient couches and local coils that are either not MRI-compatible or PET-compatible, leading to radiation damping and interference with electromagnetic fields.
Innovation Solution
Designing components and local coils using dielectric, non-ferromagnetic materials with low radiation damping coefficients, such as polyamide fiber-reinforced resins, to minimize radiation loss and interference, ensuring compatibility with both PET and MRI systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass fiber reinforced plastics are used for MRI compatibility, then MRI compatibility is improved, but radiation damping increases for PET
Solution Approach 1:
The patent applies composite materials by combining polyamide fibers with resin to create a material that simultaneously provides MRI compatibility (non-ferromagnetic, dielectric properties) and low radiation damping for PET. This composite material resolves the contradiction by integrating the beneficial properties of both fiber reinforcement and resin matrix while avoiding the harmful effects of traditional glass fiber composites in PET/MRI combined systems.
Solution Approach 2:
The patent changes the material parameters by selecting polyamide fiber-reinforced resins with specific properties: non-ferromagnetic characteristics for MRI compatibility, dielectric properties to minimize electromagnetic interference, and low density/atomic number to reduce radiation damping. This parameter optimization allows the same material to satisfy both MRI and PET requirements.
2Loss of energy
If carbon fiber reinforced plastic is used for PET compatibility, then radiation damping is reduced, but MRI compatibility deteriorates
Solution Approach 1:
The patent uses composite materials to overcome the limitations of carbon fiber reinforced plastic. By combining polyamide fibers with resin, the material achieves low radiation damping similar to carbon fiber while adding non-ferromagnetic properties and dielectric characteristics necessary for MRI compatibility, thus resolving the contradiction between PET and MRI requirements.
Solution Approach 2:
The patent optimizes material parameters by selecting polyamide fibers with appropriate tensile strength and elastic modulus to replace carbon fiber, while adjusting the resin composition to ensure non-ferromagnetic properties. This parameter change maintains the low radiation damping benefit while adding MRI compatibility.
3Strength
If conventional patient couches are used, then mechanical strength is sufficient, but electromagnetic field interference increases in MRI
Solution Approach 1:
The patent applies composite materials by using polyamide fiber-reinforced resins to manufacture patient couches and support structures. These composites provide sufficient mechanical strength for patient support while the non-ferromagnetic and dielectric properties minimize electromagnetic field interference during MRI examinations, resolving the contradiction between structural requirements and electromagnetic compatibility.
Solution Approach 2:
The patent changes the material parameters of patient couches by selecting polyamide fibers with appropriate mechanical properties and resin formulations that ensure non-ferromagnetic behavior. This parameter optimization maintains structural integrity while eliminating electromagnetic interference issues.
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 solution enables high-quality simultaneous PET and MRI examinations by minimizing radiation damping and avoiding interference with electromagnetic fields, thus maintaining the integrity of measurement results in both imaging techniques.
Implementation Method 1
components like patient couches and local coils that are either not MRI-compatible or PET-compatible, leading to radiation damping and interference with electromagnetic fields
Implementation Method 2
Designing components and local coils using dielectric, non-ferromagnetic materials with low radiation damping coefficients
Implementation Method 3
interference with electromagnetic fields
Data Source
AI summary
A combined PET/MRI device is disclosed. In at least one embodiment, the PET/MRI device includes an MRI unit for exciting nuclear spins in an examination volume and for receiving signals generated by the excitation in the examination volume, and a PET unit with a detector which surrounds the examination volume at least in part and is used for detecting radiation emanating from the examination volume, with, firstly, damping of the radiation emitted by the examination volume and, secondly, undesired interactions with electromagnetic fields of the MRI unit on the components of the PET/MRI device arranged between the examination volume and the detector being avoided due to the material properties and/or structural design of the components. Corresponding components such as, for example, patient couches, bearing or support apparatuses and local coils, are both MRI and PET compatible.