Reference Detector Focal Spot Characterization
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Solution Overview
Problem
In X-ray imaging systems, maintaining the characteristics of the focal spot within desired tolerances is challenging due to variations in electron beam current and magnetic focusing, leading to image artifacts and reduced image quality.
Innovation Solution
A CT system with a reference detector that generates localized intensity measurements using an X-ray lens assembly with slits or holes to characterize the focal spot characteristics, allowing real-time adjustment of the X-ray source and collimator operation to maintain optimal focal spot size and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time measurement of focal spot characteristics is implemented, then image quality is improved, but device complexity increases
Solution Approach 1:
An X-ray lens assembly with specific apertures and slits is introduced as an intermediary component between the X-ray source and reference detector. This lens assembly focuses and directs X-rays from specific regions of the focal spot onto corresponding detector elements, enabling precise measurement of focal spot characteristics without requiring direct complex imaging systems. The lens assembly acts as a mediator that translates focal spot spatial information into measurable detector signals.
Solution Approach 2:
The system creates a simplified copy or representation of the focal spot characteristics by measuring X-ray intensities through specifically configured apertures and slits. Instead of directly imaging the entire focal spot with complex equipment, the system uses multiple simplified measurement channels (each aperture-slit-detector combination) to capture specific aspects of the focal spot, which are then combined to reconstruct focal spot characteristics.
2Manufacturing precision
If focal spot characteristics are maintained within tolerances, then image quality is improved, but control difficulty increases
Solution Approach 1:
The system implements a closed-loop feedback mechanism where the reference detector continuously measures focal spot characteristics in real-time, and these measurements are fed back to the control system. The controller compares the measured characteristics against desired tolerances and automatically adjusts electron beam parameters (such as beam current, focal spot size, and position) to maintain compliance. This automated feedback loop simplifies operation by eliminating the need for manual monitoring and adjustment.
Solution Approach 2:
The system enables self-regulation of focal spot characteristics through automated control. The measurement and adjustment processes are performed automatically without requiring operator intervention, allowing the system to self-correct deviations from desired focal spot parameters. This self-service capability reduces operational complexity while maintaining precise control.
3Measurement precision
If localized intensity measurements are acquired, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The reference detector is divided into multiple discrete detector elements, each associated with specific apertures and slits in the X-ray lens assembly. Each detector element measures X-ray intensity from a specific localized region of the focal spot through its corresponding aperture-slit configuration. This segmentation allows precise measurement of different focal spot regions using simple, discrete measurement channels rather than a complex continuous imaging system.
Solution Approach 2:
Different regions of the reference detector are designed with different aperture and slit configurations optimized for measuring specific aspects of the focal spot. Each detector element has a tailored optical path through the X-ray lens assembly that provides localized measurement capability. This local optimization enables precise measurement of specific focal spot characteristics (such as intensity distribution, position, or size in different directions) without requiring complex universal measurement equipment.
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
Enables real-time control of the X-ray source and collimator, reducing image artifacts and improving image quality by accurately maintaining focal spot characteristics, even with minor changes in electron beam current or magnetic focusing.
Implementation Method 1
The reference detector is configured to generate a second set of electrical signals in response to a second portion of the X-rays emitted by the X-ray source
Implementation Method 2
The reference detector comprises an X-ray lens assembly. The X-ray lens assembly comprises at least one central aperture is configured to transmit X-rays emitted by the X-ray source and two or more slits or holes on opposing sides of the central aperture
Implementation Method 3
an imaging detector configured to generate a first set of electrical signals in response to a first portion of the X-rays emitted by the X-ray source
Implementation Method 4
The CT system comprises an X-ray source comprising a target material. The X-ray source is disposed on a first side of an imaging volume
Data Source
AI summary
Use of a reference detector to characterize an X-ray emission focal spot is disclosed. In certain embodiments, the reference detector may contain one or more openings or apertures that may be used to acquire localized X-ray intensity information used to derive the focal spot characteristics. In certain embodiments, the reference detector is on the source-side of the imaged volume.