X-ray Fluoroscopy Brightness Stabilization via Pre-calibrated Dose Curves
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Solution Overview
Problem
The existing Automatic Brightness Stabilization (ABS) technology in medical X-ray fluoroscopy requires a longer stabilization time due to the slow adjustment of fluoroscopic current, which results in prolonged X-ray exposure and suboptimal image brightness.
Innovation Solution
Calibrating relationship curves between initial brightness, load, and stable fluoroscopic dose before fluoroscopy, allowing for direct adjustment of the X-ray dose to achieve optimum image brightness, thereby reducing stabilization time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fluoroscopic current is adjusted through filament heating to change electron emission, then image brightness can be optimized, but the adjustment time becomes excessively long (tens to hundreds of milliseconds)
Solution Approach 1:
The system performs preliminary calibration before fluoroscopy to establish relationship curves between initial brightness, load, and stable fluoroscopic dose. This pre-computed data enables direct dose adjustment during actual operation without waiting for slow filament heating processes, thus resolving the contradiction between achieving precise brightness optimization and minimizing stabilization time
Solution Approach 2:
The patent replaces the mechanical/thermal filament heating process with an electronic control approach. Instead of physically heating the filament to adjust current, the system uses pre-calculated relationship curves and electronic dose adjustment mechanisms, substituting the slow thermal process with faster electronic computation and control, thereby reducing stabilization time while maintaining brightness optimization precision
2Reliability
If PID controller is used to adjust fluoroscopic kV and mA based on brightness difference, then image brightness can be stabilized, but overall stabilization time becomes too long due to slow mA adjustment
Solution Approach 1:
The system performs preliminary calibration to establish relationship curves between initial brightness, load, and stable fluoroscopic dose before actual fluoroscopy operation. These pre-computed curves enable direct calculation of the stable dose during operation, eliminating the need for slow iterative PID adjustment and achieving both reliable brightness stabilization and reduced stabilization time
Solution Approach 2:
The patent introduces relationship curves as an intermediary between the brightness measurement and the dose adjustment. Instead of directly using slow PID control to adjust dose based on brightness feedback, the system uses the pre-calculated relationship curves as an intermediary that maps brightness and load values to the corresponding stable dose, significantly accelerating the stabilization process while maintaining reliability
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 approach significantly shortens the stabilization time, reducing X-ray exposure and improving image brightness accuracy, while allowing for more efficient use of X-ray doses.
Implementation Method 1
An X-ray tube (hereinafter called 'the tube') is a device for generating X-rays, wherein adjustment of X-ray dose may be implemented by adjustment of fluoroscopic voltage (hereinafter called 'fluoroscopic kV') and fluoroscopic current (hereinafter called 'fluoroscopic mA')
Implementation Method 2
heating filament through the filament current to change the temperature of the filament, which may change the amount of electrons emitted from the filament to the tube anode target surface
Implementation Method 3
different objects (typically patients) may have different X-ray blocking abilities, and X-rays passing through different objects may have different attenuations
Data Source
AI summary
An image brightness adjustment method and an image brightness adjustment device are provided in the present disclosure. A brightness of a fluoroscopic image obtained by irradiating an object with an initial fluoroscopic dose of X-rays is acquired as an initial brightness. A current load corresponding to the initial brightness is determined according to a relationship between image brightness and loads for the initial fluoroscopic dose, where the current load indicates an X-ray blocking ability of the object. Then, a stable fluoroscopic dose corresponding to the current load is determined according to a relationship between load and stable fluoroscopic dose, where the stable fluoroscopic dose is used to obtain a fluoroscopic image of a predetermined brightness for the object.