Radial Detector Array for Scatter Reduction in Veterinary Fluoroscopy
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Solution Overview
Problem
Conventional fluoroscopy in veterinary applications faces significant image degradation due to X-ray scatter, especially with large animals, as traditional anti-scatter grids are inadequate for maintaining clear image quality.
Innovation Solution
A mechanical system featuring a rotatable plate with radially arranged detectors and a drive assembly to rotate the plate, reducing off-axis X-ray scattering by capturing images on-axis, with collimators on the detector spokes to prevent scattered radiation from reaching the detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluoroscopy with projection radiography is used, then real-time imaging is achieved, but image quality degrades due to X-ray scatter especially in large animals
Solution Approach 1:
The detector array is segmented into multiple independently controllable detector elements arranged in a curved configuration. This segmentation allows selective activation of only those detectors receiving primary X-ray beams, while detectors in regions likely to receive scattered radiation are deactivated or used with reduced weighting, thereby improving image quality by excluding scatter-affected data
Solution Approach 2:
Different regions of the detector array are treated with different quality criteria. Detectors positioned to receive primarily primary radiation are used with full weighting, while detectors in regions prone to scatter reception are either deactivated or used with reduced influence on the final image reconstruction, creating a locally optimized quality approach
2Adaptability or versatility
If the object being scanned is made larger (e.g., large animals), then the applicability of the fluoroscope is improved, but X-ray scatter increases causing more fogging effect
Solution Approach 1:
The system transitions from conventional planar projection radiography to a curved detector array configuration that wraps around the object being imaged. This dimensional change allows the detectors to be positioned in three-dimensional space to optimize reception of primary radiation while avoiding regions where scattered radiation would contaminate the signal, enabling imaging of large animals with reduced scatter effects
3Object-affected harmful factors
If anti-scatter grids are used, then some scatter reduction is achieved, but they are inadequate for maintaining clear image quality in large animals
Solution Approach 1:
The system introduces an intermediary computational step between X-ray detection and image formation. By evaluating the position and orientation of each detector element relative to the X-ray source and object, the system determines which detectors are likely to receive scattered radiation and adjusts their contribution to the final image accordingly, providing a sophisticated scatter rejection mechanism that goes beyond physical grids
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 system significantly improves image clarity by minimizing off-axis X-ray scatter, providing clearer fluoroscopic images of large animals, particularly in equine and veterinary fluoroscopy.
Implementation Method 1
an X-ray generator which sends an X-ray beam towards a detector array
Implementation Method 2
capturing and displaying X-ray images at a high or low frame rate
Data Source
AI summary
A system for taking fluoroscopic images of large animals having a rotatable plate with a plurality of detectors disposed on the rotatable plate, wherein the plurality of detectors are arranged as spokes extending radially outwardly from a central rotational point on the rotatable plate with collimators disposed on the side edges of the spokes. A drive assembly rotates the rotatable plate about an axis extending through the central rotational point at a speed such that the duration of successive image frames corresponds to the time taken for each spoke of detectors to move to the position of an adjacent spoke of detectors.