Medical Imaging Trailer Shell-In-Shell Air Gap Design
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Solution Overview
Problem
Mobile medical imaging trailers face challenges in maintaining RF integrity, mechanical stability, and magnetic shielding, which can affect image quality due to environmental factors like temperature variations, wind pressures, and vibrations, and existing solutions often increase weight and cost.
Innovation Solution
A trailer design featuring a shell-in-shell configuration with an air gap between the exterior and interior shells to decouple the magnetic shielding from environmental influences, incorporating thermal insulation and RFI shielding to maintain image quality without excessive weight or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic shielding is applied to the trailer walls, then magnetic field containment is improved, but the shielding structure becomes susceptible to temperature-induced expansion and contraction affecting image quality
Solution Approach 1:
The trailer structure is divided into two separate shells: an outer shell that interfaces with the external environment and an inner shell that contains the magnetic shielding. This segmentation isolates the shielding from temperature-induced structural changes while maintaining magnetic field containment effectiveness.
Solution Approach 2:
An air gap is introduced as an intermediary layer between the outer and inner shells. This air gap acts as a thermal buffer, preventing direct heat transfer to the magnetic shielding while allowing the outer shell to expand and contract freely in response to external temperature variations.
2Weight of moving object
If the trailer is designed to be mobile within size and weight constraints, then transportability is improved, but mechanical stability during transportation deteriorates
Solution Approach 1:
The trailer employs a composite shell structure where the outer shell provides structural strength and environmental protection, while the inner shell houses the sensitive imaging equipment. This composite design optimizes the weight-to-strength ratio, ensuring mechanical stability without excessive weight.
3Reliability
If RF shielding is provided to prevent external RF noise, then RF integrity is improved, but emissions from the interior may still interfere with external devices
Solution Approach 1:
The trailer implements a nested shielding configuration where the inner shell containing the MRI system is enclosed within the outer shell. This nested structure creates multiple layers of RF protection, effectively containing both incoming external RF noise and outgoing emissions from the imaging system, preventing interference with external devices.
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 decoupled magnetic shielding and insulation provide consistent high-image quality across varying environmental conditions, minimizing image distortions and maintaining the stability of the MRI device within the trailer.
Implementation Method 1
an air gap between at least a portion of the first shell and the second shell to effectively isolate the first shell from the second shell
Implementation Method 2
a first shielding layer... it is important that the transmission of RF noise or RF interference ('RFI') is prevented from entering the interior of the medical imaging trailer
Data Source
AI summary
A trailer for use with a mobile medical diagnostic imaging system includes a first shell having an exterior skin and at least one thermal insulation layer, a second shell within the first shell, the second shell having a first shielding layer, and an air gap between at least a portion of the first shell and the second shell to effectively isolate the first shell from the second shell.