Solid-State Detector: Reducing Ghosting with LED Reset Control
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Summary
Problems
Solid-state detectors with amorphous silicon active pixel matrices suffer from ghosting artifacts due to residual charges trapped in deep energy levels, leading to non-uniform X-ray image quality, especially when individual light-emitting diodes fail, causing uneven reset distribution.
Innovation solutions
The ability to individually drive and control the intensity of light-emitting diodes in the reset light source allows for matching and substitution of faulty diodes, maintaining constant intensity and homogeneity, thereby reducing ghosting artifacts and ensuring uniform image quality.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a flat board composed of light-emitting diodes is fitted as a reset light underneath the a-Si plate, then ghosting artifacts are reduced, but non-uniform reset distribution occurs when individual light-emitting diodes fail
Why choose this principle:
The reset light source is divided into multiple individually controllable light-emitting diodes arranged in a matrix, allowing each LED to be controlled separately. This segmentation enables selective adjustment or deactivation of specific LEDs that have failed, maintaining overall reset uniformity despite individual failures.
Principle concept:
If a flat board composed of light-emitting diodes is fitted as a reset light underneath the a-Si plate, then ghosting artifacts are reduced, but non-uniform reset distribution occurs when individual light-emitting diodes fail
Why choose this principle:
The intensity parameter of each light-emitting diode can be individually adjusted to compensate for failures. By changing the intensity parameters of neighboring LEDs or adjusting the timing parameters of reset illumination, the system maintains uniform reset distribution even when some LEDs fail.
Application Domain
Data Source
AI summary:
The ability to individually drive and control the intensity of light-emitting diodes in the reset light source allows for matching and substitution of faulty diodes, maintaining constant intensity and homogeneity, thereby reducing ghosting artifacts and ensuring uniform image quality.
Abstract
For a uniform image quality of digital X-ray records, a solid-state detector is provided. The detector includes light-sensitive pixel elements arranged in an active matrix, and a reset light source arranged behind them in the radiation direction of X-ray radiation, with the reset light source being in the form of an arrangement with light-emitting diodes and with the light-emitting diodes being designed such that can be driven individually and their intensity can be controlled individually. At least one of a failed and malfunctioning light-emitting diode is detectable. The intensities of the serviceable light-emitting diodes are driven and controlled in the event of a failure or a malfunction of at least one light-emitting diode in such a manner that the intensity and/or the homogeneity of the reset light source remains the same.