Photon-Counting Radiation Imaging with Real-Time Subpixel Correction
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Solution Overview
Problem
Existing photon counting detectors face challenges in accurately correcting output signals when subpixels fail during operation, as previous methods only address pre-recorded failures and are ineffective for real-time adjustments.
Innovation Solution
A radiation imaging device with a photon counting detector that includes a failure detection section to identify failing subpixels and a data correction section to generate correction data for the affected pixel, ensuring accurate output signals even when subpixels fail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction is made for previously recorded failed subpixels only, then correction accuracy for known failures is improved, but the system cannot handle subpixel failures that occur during operation
Solution Approach 1:
The patent implements dynamic failure detection and correction by continuously monitoring subpixel performance during operation. The failure detection section identifies failed subpixels in real-time, and the correction section dynamically adjusts pixel output signals based on current failure status, enabling the system to adapt to failures occurring during operation rather than only handling pre-recorded failures
Solution Approach 2:
The patent establishes a feedback mechanism where the failure detection section continuously monitors subpixel output and provides information to the correction section. This closed-loop feedback enables real-time identification and correction of failed subpixels, allowing the system to maintain accurate pixel output signals even when failures occur during operation
2Measurement precision
If a subpixel is divided into multiple subpixels to handle high photon flux, then counting accuracy under high flux conditions is improved, but the complexity of detecting and correcting subpixel failures increases
Solution Approach 1:
The patent divides each pixel into multiple subpixels to handle high photon flux conditions, where each subpixel independently counts photons. This segmentation allows the system to maintain counting accuracy under high flux by distributing the counting load across multiple subpixels, preventing saturation that would occur in a single pixel
Solution Approach 2:
The failure detection section automatically monitors each subpixel's performance and identifies failures without external intervention. The correction section then automatically generates correction data based on the detected failures, enabling the system to self-correct and maintain accurate pixel output signals without requiring manual intervention or complex external correction mechanisms
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
Enables real-time correction of output signals in photon counting detectors, preventing artifacts in medical images by detecting and correcting subpixel failures, thereby maintaining image quality.
Implementation Method 1
a photon counting detector that counts the number of radiation photons
Data Source
AI summary
To provide a radiation imaging device which, even when a subpixel fails during operation of the photon counting detector, can correct an output signal of the pixel including the failed subpixel. A radiation imaging device that has a photon counting detector to count radiation photons and can correct an output signal of a pixel including a failed subpixel even if the subpixel fails during operation of the photon counting detector. The photon counting detector comprises: a pixel comprised of a plurality of subpixels; a data processing section that calculates an output signal of the pixel according to the number of radiation photons counted in each of the subpixels; and a failure detection section that detects a failure of the subpixel according to the number of radiation photons counted in the subpixel and outputs the position of the failed subpixel. The radiation imaging device further comprises a data correction section that generates correction data for the pixel including the failed subpixel according to the position of the failed subpixel.