CT Detector Heat Sink with Z-Axis Cooling Passageway
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Solution Overview
Problem
Third-generation CT scanners face challenges in maintaining stable detector performance due to thermal management issues, particularly with increased detector length along the Z-axis, where temperature variations can cause calibration drift and reduce dose efficiency.
Innovation Solution
A spherical CT detector assembly is fabricated with a support structure and heat sink extending along the Z-axis, featuring a passageway for cooling air to flow through, which helps maintain uniform temperature distribution and minimizes thermal gradient by using heat transfer enhancement devices like heat pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the detector width in Z-axis is increased to cover 160 mm or more, then the coverage area is improved, but the manufacturing complexity and reliability deteriorate due to the impracticality of building very large monolithic modules
Solution Approach 1:
The detector is divided into multiple smaller sub-modules stacked along the Z-axis, with each sub-module having a manageable width (e.g., 40mm). This segmentation allows practical manufacturing of individual modules while achieving large total coverage (160mm or more) through stacking, resolving the contradiction between coverage area and manufacturing complexity
2Area of stationary object
If the detector width in Z-axis is increased to cover 160 mm or more, then the coverage area is improved, but the reliability deteriorates due to concerns with very large monolithic structures
Solution Approach 1:
By segmenting the detector into multiple independent sub-modules stacked along the Z-axis, the system achieves large coverage area (160mm or more) while maintaining reliability. Each sub-module is independently manufactured and tested, reducing the risk associated with very large monolithic structures and allowing modular replacement if needed
3Stability of the object's composition
If detectors are heated during calibration and use to ensure stable temperature, then the stability is improved, but the dose efficiency deteriorates due to reduced gain
Solution Approach 1:
A heat sink is introduced as an intermediary thermal management component between the detector modules and the environment. The heat sink actively controls temperature to maintain detector stability without requiring continuous heating of the detector itself, thereby preserving dose efficiency while ensuring operational stability
4Area of stationary object
If the number of slices is increased to enable greater coverage, then the coverage capability is improved, but the thermal management difficulty increases due to increased detector width
Solution Approach 1:
The detector is segmented into multiple sub-modules stacked along the Z-axis, with each sub-module equipped with its own heat sink. This segmentation enables independent thermal management of each module, making it practical to achieve large coverage (160mm or more) without overwhelming thermal management complexity
Solution Approach 2:
The detector architecture transitions from a single-plane structure to a three-dimensional stacked configuration along the Z-axis. This dimensional change allows coverage area to increase while thermal management is handled through vertical stacking with individual heat sinks for each sub-module, managing thermal complexity effectively
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
This design enhances thermal management, stabilizes detector performance, and maintains image quality across varying temperatures, improving reliability and cost-effectiveness by ensuring pseudo-isothermal conditions and reducing sensitivity to thermal drift.
Implementation Method 1
a heat sink extending along the Z-direction and having the support structure mounted thereon
Implementation Method 2
a passageway passing therethrough and along the Z-direction, such that cooling air may pass into the passageway at a first end of the heat sink and exit the passageway at a second end of the heat sink opposite the first end
Data Source
AI summary
A detector assembly for a CT system includes a plurality of detector modules, each detector module including a grid of pixelated scintillators, a photodiode having pixelations that correspond with the pixelated scintillators, and an electronics package for processing acquired X-ray data, a support structure extending along a Z-direction of the CT system and having the plurality of detector modules positioned thereon, and a heat sink extending along the Z-direction and having the support structure mounted thereon, the heat sink including a passageway passing therethrough and along the Z-direction, such that cooling air may pass into the passageway at a first end of the heat sink and exit the passageway at a second end of the heat sink opposite the first end.