MRI Bore Projector Passive Cooling and EMI Shielding
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Solution Overview
Problem
Existing projector systems for MRI scans face challenges in cooling and electromagnetic interference within high magnetic fields, leading to overheating and interference with the MRI process.
Innovation Solution
A projector housed in a metallic enclosure acting as a heat sink and Faraday cage, with fins to enhance cooling, and a 90-degree turn design to attenuate electromagnetic radiation, along with a server-based control system to reduce processing power and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a projector is used in an MRI environment, then images can be projected to the patient, but the projector overheats due to inadequate cooling in high magnetic fields
Solution Approach 1:
The patent replaces the conventional mechanical fan-based cooling system with a passive heat sink system that uses natural convection and conduction. The heat sink is integrated into the projector housing and uses aluminum fins to dissipate heat without moving parts, eliminating the reliability issues associated with fan operation in high magnetic fields.
Solution Approach 2:
The projector housing serves multiple functions: it encloses the projector components, provides structural support, and acts as a heat sink for passive cooling. The aluminum housing with integrated fins simultaneously provides electromagnetic shielding and thermal management, reducing the need for separate cooling components.
2Temperature
If conventional cooling fans are used in the projector, then cooling effectiveness is improved, but electromagnetic interference with the MRI process increases
Solution Approach 1:
The patent eliminates electromagnetic interference by replacing the electrical fan-based cooling system with a passive mechanical heat sink system. The heat dissipation is achieved through natural convection currents and thermal conduction through the aluminum housing and fins, completely removing electromagnetic motors and fans from the projector.
Solution Approach 2:
The heat sink system operates autonomously without external control or power input. The passive cooling mechanism uses natural convection and conduction to dissipate heat automatically based on the temperature differential between the projector components and the surrounding environment, requiring no active management or electromagnetic components.
3Ease of operation
If high processing power is used in the projector, then image quality and control capabilities are improved, but electromagnetic radiation and heat generation increase
Solution Approach 1:
The patent divides the control system into two separate components: a remote control unit that the patient can operate externally, and a minimal processing unit within the projector that only handles basic image projection functions. This segmentation reduces the processing power and electromagnetic radiation requirements of the projector itself while maintaining full control capabilities.
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 effectively cools the projector passively and minimizes electromagnetic interference, ensuring stable operation within MRI magnetic fields without overheating or disrupting the MRI process.
Implementation Method 1
A projector is enclosed in a housing that functions as a heat sink
Implementation Method 2
the housing is made from a conductive material, which in some embodiments is metallic
Implementation Method 3
Fins are attached to the housing to increase the surface area of the heat sink and thereby increase the effectiveness of the heat sink
Implementation Method 4
the housing functions as a heat sink and a Faraday cage
Implementation Method 5
since the electromagnetic radiation is essentially blocked or severely attenuated by the metallic walls
Implementation Method 6
for electromagnetic radiation to escape from the projector via the separation between the lid and the rest of the housing of the projector, the electromagnetic radiation needs to follow a path that includes at least a 90-degree turn formed by (1) the ledge of the interior, (2) the walls of the interior and (3) the lid, which reduces the likelihood of electromagnetic radiation escaping the interior of the projector housing
Data Source
AI summary
Various embodiments of a method and apparatus including a projector for an MRI system are disclosed. The projector is enclosed in a metal housing with a heat exchanger of various embodiments of fins and surface areas to function as a heat sink. In some embodiments, the surface area of the heat sinks is large enough to reliably function within a magnetic field of up to 3 Tesla without overheating. In some embodiments, the projector is cooled by the heat sink without a fan or internal cooling. In an embodiment, the housing of the projector shields the projector and forces electromagnetic radiation to follow a path that includes a 90-degree turn to escape the interior of the projector, reducing the likelihood of electromagnetic radiation escaping.