Multi-Source X-Ray Auto Exposure Control for Uniform CT Energy
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Solution Overview
Problem
Existing auto exposure control systems are not applicable to multi-source CT systems, leading to inconsistencies in X-ray energy levels and signal-to-noise ratios due to variations in X-ray sources, affecting CT value calculations and image quality.
Innovation Solution
An auto exposure control system with a main control unit and auto exposure units connected to each X-ray source, using energy accumulation detection and a high-speed real-time serial bus to adjust exposure time sequences, ensuring uniform X-ray energy output across multiple sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single AEC detector and high voltage generator are used for auto exposure control, then the system structure is simple, but it cannot control multiple X-ray sources simultaneously
Solution Approach 1:
The patent divides the single AEC detector into multiple independent AEC detectors, with each detector dedicated to monitoring a specific X-ray source. This segmentation allows simultaneous independent control of multiple X-ray sources while maintaining relatively simple individual detector units, resolving the contradiction between system simplicity and multi-source control capability.
2Measurement precision
If exposure time is extended to increase signal-to-noise ratio, then image quality improves, but total exposure time increases
Solution Approach 1:
The patent dynamically adjusts exposure time for each X-ray source based on real-time AEC feedback signals. Instead of using a fixed exposure time, the system modifies exposure duration individually for each source according to its actual output characteristics, optimizing the balance between signal-to-noise ratio and total exposure time.
Solution Approach 2:
The system changes the exposure time parameter dynamically for each X-ray source based on its measured output. By adjusting exposure time as a variable parameter rather than a fixed value, the system optimizes image quality while minimizing total exposure time through individualized parameter optimization.
3Measurement precision
If individual AEC detectors are added for each X-ray source, then control precision improves, but device complexity increases
Solution Approach 1:
The patent segments the control system into independent AEC detector units, each responsible for a specific X-ray source. This modular segmentation achieves precise individual control while allowing each detector to be a simple, standardized unit, thus improving precision without proportionally increasing overall system complexity.
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
The system stabilizes X-ray energy output, optimizing image uniformity and density resolution by adjusting exposure times based on energy thresholds, thereby enhancing image quality in multi-source CT systems.
Implementation Method 1
the auto exposure control detector performs energy integration on the X-rays and outputs an auto exposure control signal
Data Source
AI summary
Disclosed are an auto exposure control system and an image calibration method. The system comprises a main control unit and a plurality of auto exposure units, wherein the main control unit is connected to each of the auto exposure units; and the auto exposure units are in cascading connection. According to the system, detection of each X-ray source is realized by means of auto exposure units, such that an energy accumulation value and a KV level of X-rays are obtained; and when the energy accumulation value of X-rays reaches an energy threshold value, an auto exposure control signal is sent to a main control unit, such that the main control unit adjusts an exposure time sequence according to the auto exposure control signal, the aim of auto exposure control is achieved.