X-ray detector dynamic aperture for spatial resolution
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Solution Overview
Problem
Conventional X-ray detectors have limited spatial resolution due to fixed detector element sizes, making it difficult to accurately detect fine structures like thin wires, and increasing detector density degrades signal-to-noise ratio and increases system costs.
Innovation Solution
A dynamic aperture system using a shielding element that varies its effective receiving area by temporally changing the shadowing of X-rays on detector elements, allowing for increased spatial resolution without increasing the number of detector elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of detector elements per unit length is increased to obtain higher spatial resolution, then the spatial resolution is improved, but the system cost increases and the signal-to-noise ratio degrades
Solution Approach 1:
The patent applies the dynamics principle by making the effective receiving area of detector elements dynamically variable through a movable shielding element. Instead of using a fixed high-density detector array, the system uses a lower-density detector array where each detector element's effective area is dynamically adjusted during operation. This allows the system to achieve high spatial resolution when needed while maintaining lower system cost and better signal-to-noise ratio by using fewer total detector elements.
Solution Approach 2:
The patent applies parameter changes by varying the effective receiving area parameter of detector elements in real-time. The shielding element moves to change the illuminated area of each detector element, effectively changing the detection parameter without physically changing the detector structure. This allows dynamic adjustment of spatial resolution while maintaining a fixed, cost-effective detector hardware configuration.
2Measurement precision
If the area of each detector element is decreased to increase detector density, then the spatial resolution is improved, but the signal-to-noise ratio degrades
Solution Approach 1:
The system dynamically adjusts the effective receiving area of each detector element using a movable shielding element. When high spatial resolution is required, the shielding element creates smaller effective areas. When signal-to-noise ratio is prioritized, the shielding element allows larger effective areas. This dynamic adjustment allows the system to optimize between resolution and signal quality based on operational requirements, rather than being constrained by fixed small detector element areas.
Solution Approach 2:
The shielding element is positioned in advance to define the effective receiving area before X-ray detection occurs. By pre-configuring the shielding pattern, the system prepares the optimal effective area for each detector element based on the required spatial resolution, ensuring that the full detector area can be utilized effectively without wasting detection capability on areas that would not contribute to the desired resolution.
3Measurement precision
If the transport speed is reduced to achieve higher spatial resolution in the scanning direction, then the spatial resolution is improved, but the throughput decreases
Solution Approach 1:
The system dynamically varies the effective receiving area of detector elements during the scanning process. By adjusting the shielding element position in sync with the transport speed, the system can maintain high spatial resolution even at higher transport speeds. The dynamic area adjustment compensates for the reduced integration time at higher speeds, allowing optimal performance across a range of transport velocities without sacrificing throughput.
4Measurement precision
If the readout frequency is increased to achieve higher spatial resolution in the scanning direction, then the spatial resolution is improved, but the signal-to-noise ratio degrades
Solution Approach 1:
The effective receiving area is dynamically adjusted in synchronization with the readout frequency. When readout frequency increases, the system can reduce the effective area to maintain resolution while the shorter integration time is compensated by the optimized area configuration. This dynamic coordination between area adjustment and readout timing allows high spatial resolution to be achieved without the usual penalty to signal-to-noise ratio.
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 enhances the spatial resolution of X-ray images by dynamically adjusting the effective receiving area of detector elements, enabling the detection of finer details without compromising signal quality or increasing system costs.
Implementation Method 1
A dynamic aperture system using a shielding element that varies its effective receiving area by temporally changing the shadowing of X-rays on detector elements
Data Source
AI summary
Disclosed is an arrangement of an X-ray detector and a shielding element shielding X-rays (RX) for increasing the spatial resolution of the X-ray detector, wherein the X-ray detector includes at least one detector line having at least one detector element arranged along the detector line, the shielding element including one or more regions opaque to X-rays (RX) and at least one region transparent to X-rays (RX), the shielding element arranged above the receiving surface for the X-rays (RX) of the at least one detector element, and the shielding element and the at least one detector element are movable relative to each other, so that the effective receiving surface for X-rays (RX) of the at least one detector element is correspondingly variable.