Radiography System Light Source Displacement Correction
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Solution Overview
Problem
Radiography systems face inaccuracies in aligning the field of view (FOV) between the light and X-ray fields due to displacement of the light source, leading to misalignment of the collimator openings and subsequent disagreement in the FOV between the light and X-ray fields.
Innovation Solution
A radiography system that includes an X-ray tube, a collimator, a light source for ranging, and a memory and control system to calculate and correct the displacement of the light source, ensuring the FOV in the light field matches the target value by adjusting the collimator opening based on pre-calculated displacement values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light source is used for ranging through a collimator, then the FOV in the light field can be checked in advance, but the light source may be displaced due to component tolerances causing disagreement between light field FOV and X-ray field FOV
Solution Approach 1:
The system performs preliminary measurement of the light source displacement relative to the X-ray focal spot before actual radiography. The control unit calculates the displacement amount and stores it in memory, then uses this pre-acquired information to correct the collimator opening, thereby compensating for the light source displacement and achieving accurate FOV alignment.
Solution Approach 2:
The system measures the actual light source position, compares it with the ideal position, calculates the displacement, and uses this feedback information to adjust the collimator opening. This closed-loop feedback mechanism ensures that the light field FOV agrees with the X-ray field FOV despite light source displacement.
2Device complexity
If the light source position is not corrected, then the system structure remains simple, but the FOV in the light field disagrees with the FOV in the X-ray field
Solution Approach 1:
Instead of using complex mechanical adjustment mechanisms to physically reposition the light source or collimator, the system substitutes a computational approach. The control unit calculates the displacement amount based on measured positions and determines the corrected collimator opening through mathematical computation, replacing mechanical adjustment with intelligent control.
Solution Approach 2:
The system changes the parameter being controlled from the light source position to the collimator opening size. By keeping the light source fixed and adjusting the collimator opening based on calculated displacement, the system achieves FOV agreement through parameter transformation rather than physical repositioning.
Data Source
AI summary
An object of the present invention is to provide a radiography system in which an FOV in a light field agrees with an FOV in an X-ray field irrespective of a displacement of a light source. The radiography system comprises an X-ray tube, a collimator that forms an X-ray beam to be irradiated from the X-ray tube to an object of radiography, and a light source that irradiates light, which is used for ranging, to the object of radiography via the collimator. The radiography system further comprises a memory in which the magnitude of a displacement of the light source calculated in advance is stored, and a control unit that controls the opening of the collimator on the basis of the position of the light source, which is corrected based on the magnitude of a displacement read from the memory, so that an FOV of light to be used for ranging will agree with a target value.