Laser Alignment Assembly for X-Ray Detector Positioning
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Solution Overview
Problem
Achieving precise alignment between an x-ray source and a digital radiographic detector in mobile radiographic imaging systems is challenging due to the need to reconcile six degrees of freedom in spatial coordinates, which affects the accuracy of radiographic image processing and reconstruction, especially in tomosynthesis systems.
Innovation Solution
The use of detectable planar laser beams projected by laser modules, intersecting with sensors on a frame attached to the x-ray head, allows for manual or automatic adjustment of the x-ray source and detector alignment by determining the geometric relationship between their coordinate systems, enabling precise positioning and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment adjustment is performed without laser guidance, then the alignment process becomes simpler in terms of equipment, but the alignment precision deteriorates due to the complexity of reconciling six degrees of freedom
Solution Approach 1:
The patent introduces laser modules as an intermediary alignment tool that projects visible laser lines along the x-ray beam path. These laser lines serve as visual mediators between the x-ray source and detector, allowing operators to see and adjust the alignment of six degrees of freedom without directly measuring all coordinate transformations. The laser modules are positioned to project lines that intersect at the focal spot, providing intuitive visual feedback for alignment adjustment.
Solution Approach 2:
The patent replaces complex mechanical alignment measurement systems with optical laser projection. Instead of using mechanical devices to measure and calculate six degrees of freedom coordinate transformations, the system uses laser optics to project visible reference lines that directly indicate alignment status. This substitution simplifies the alignment process while maintaining high precision through optical rather than mechanical means.
2Measurement precision
If laser modules are added to provide alignment guidance, then alignment precision improves, but the device complexity and cost increase
Solution Approach 1:
The patent designs the laser modules to serve multiple functions: they provide alignment visualization during positioning, indicate the focal spot location through intersecting laser lines, and guide collimator alignment. By making the laser system multi-functional, the patent reduces the need for separate alignment devices, thereby limiting the increase in overall system complexity while maintaining high alignment precision.
Solution Approach 2:
The patent uses laser modules to create optical copies or projections of the x-ray beam path and focal spot position. Instead of directly measuring physical coordinates, the system projects visible laser line copies that represent the invisible x-ray geometry. This copying approach allows operators to visually align components based on laser projections rather than complex coordinate measurements, improving precision without proportionally increasing complexity.
3Manufacturing precision
If precise alignment within specified tolerances is achieved, then image quality and reconstruction accuracy improve, but the alignment adjustment process becomes more difficult and time-consuming
Solution Approach 1:
The patent implements visual feedback through laser projection where the intersecting laser lines directly indicate whether alignment is within specified tolerances. When the laser lines from multiple modules intersect precisely at the focal spot position, it provides immediate visual confirmation of correct alignment. This feedback mechanism guides operators to achieve precise alignment within tolerances without requiring complex measurements or calculations, thereby maintaining ease of operation while ensuring high precision.
Solution Approach 2:
The patent uses laser modules to establish preliminary visual alignment references before actual x-ray imaging. The laser lines are projected in advance to show the expected beam path and focal spot position, allowing operators to pre-adjust components to within specified tolerances. This preliminary visual guidance simplifies the subsequent alignment adjustment process by providing clear target positions that must be achieved, reducing the difficulty and time required to meet precision requirements.
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 method provides accurate alignment within specified tolerances, enhancing the quality of radiographic images and facilitating 3D image reconstruction by ensuring correct geometry and avoiding overfilling of the detector with x-rays.
Implementation Method 1
a first source of electromagnetic radiation is configured to project a first planar beam detectable along a first linear dimension, and a second source of electromagnetic radiation configured to project a second planar beam detectable along a second linear dimension
Data Source
AI summary
Laser sources are configured to project planar laser beams in a preselected geometric relationship. A laser detector is configured to detect, locate, and identify the planar laser beams.