Steerable X-ray Detector Module Alignment
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Solution Overview
Problem
Current X-ray CT systems face challenges in maintaining image quality due to scattered X-ray photons, which degrade signal-to-noise ratio and require precise alignment of detector modules with the focal spot, complicated by the focal spot shifting as the X-ray tube heats up, leading to potential shadowing and image degradation.
Innovation Solution
The system employs a flexible mounting mechanism with piezoelectric actuators to actively adjust and align X-ray detector modules, allowing for precise positioning and realignment with the X-ray source, and incorporates a 2D anti-scatter grid to effectively block off-axis photons, using a combination of actuators for X-Y motion, tilting, and Z-axis adjustments to ensure optimal alignment and maximize X-ray intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If detector modules are fixed in a rigid array configuration, then manufacturing and assembly are simplified, but alignment precision with the focal spot deteriorates due to focal spot shifting
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed rigid mounts with flexible mounting mechanisms that allow detector modules to dynamically adjust their positions. Each detector module is equipped with actuators that enable real-time positioning adjustments, allowing the system to adapt to focal spot shifts and maintain alignment precision throughout the X-ray tube's operational lifecycle.
Solution Approach 2:
The system implements self-service through automated feedback control where detectors continuously monitor X-ray intensity and automatically adjust their positions via actuators to maintain optimal alignment with the focal spot. This self-correcting mechanism eliminates the need for manual realignment and compensates for focal spot drift automatically.
2Object-affected harmful factors
If detector modules are positioned far from the focal spot to reduce scattered photons, then image noise is reduced, but X-ray intensity signal strength deteriorates
Solution Approach 1:
The patent applies local quality by implementing individualized positioning for each detector module rather than a uniform array configuration. Each detector can independently optimize its distance and angle relative to the focal spot, allowing some detectors to be positioned closer for higher signal intensity while others are positioned farther to reduce scattered photon interference, depending on their specific imaging requirements.
Solution Approach 2:
The dynamic positioning capability allows detector modules to adjust their distances from the focal spot in real-time, optimizing the balance between signal intensity and scattered photon rejection for each detection event based on imaging conditions and requirements.
3Adaptability or versatility
If multiple detector modules are used to improve imaging coverage, then imaging capability is enhanced, but alignment maintenance complexity increases
Solution Approach 1:
Each detector module is equipped with autonomous alignment capabilities through integrated actuators and feedback control, allowing them to self-correct their positions independently. This eliminates the need for complex manual realignment procedures when adding or repositioning detector modules, making system expansion and maintenance straightforward.
Solution Approach 2:
The patent segments the detector system into independent, modular units with self-contained positioning and alignment capabilities. This segmentation allows each module to operate and be maintained independently, simplifying the overall system operation and reducing the complexity associated with multi-module coordination and alignment.
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 solution enhances image resolution and reduces noise by actively aligning detector modules with the focal spot, improving signal-to-noise ratio and maintaining image quality even as the focal spot shifts, thereby improving the overall imaging performance of X-ray CT systems.
Implementation Method 1
The system employs a flexible mounting mechanism with piezoelectric actuators to actively adjust and align X-ray detector modules
Implementation Method 2
incorporates a 2D anti-scatter grid to effectively block off-axis photons
Implementation Method 3
The X-ray detector module includes a 2-D anti-scatter grid, scintillator material, and a photodiode array
Implementation Method 4
The X-ray detector module includes a 2-D anti-scatter grid, scintillator material, and a photodiode array
Data Source
AI summary
An X-ray system includes a plurality of X-ray detector modules and a backbone for positioning the detector modules relative to an X-ray source. A mount for each detector module is coupled to the backbone. One or more actuators extend between the mount and the detector module for individually adjusting the detector module relative to the mount for aligning the detector module. A plate with a rocker member may be attached behind each module and the mount then includes a frame with cradle surfaces for the rocker member.