X-ray Detector Sense Node for Autonomous Exposure Timing
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Solution Overview
Problem
Existing digital radiographic imaging systems lack the ability to independently sense the start and end of X-ray exposure, requiring external synchronization between the X-ray generator and detector, which can lead to inefficiencies and errors in image capture.
Innovation Solution
Incorporating a sense node capacitively coupled to the floating node of the photo-sensor to determine the start, stop, and temporal profile of X-ray exposure, using various circuit configurations such as a sense electrode between the substrate and cathode, a sense plane, or parasitic capacitance of the data line, allowing the detector to autonomously enter charge integration and readout modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external synchronization is used between X-ray generator and detector, then the system can operate with existing generators, but the system cannot independently sense the start and end of X-ray exposure
Solution Approach 1:
The detector performs self-service by incorporating an integrated sense node that autonomously detects the start and end of X-ray exposure. This eliminates the need for external synchronization systems while maintaining full operational capability, allowing the detector to independently determine when to enter charge integration mode and when to initiate readout.
2Extent of automation
If a sense node is added to the detector circuit, then independent sensing of X-ray exposure is enabled, but the device complexity increases
Solution Approach 1:
The sense node is merged with the existing detector circuitry, specifically integrating with the floating node of the photo-sensor and the readout amplifier. This consolidation allows the sense function to be added without requiring completely separate circuit boards or additional complex subsystems, thereby minimizing the increase in device complexity while achieving independent sensing capability.
3Productivity
If the detector autonomously determines exposure timing, then image capture efficiency is improved, but the risk of false positives and negatives increases
Solution Approach 1:
The sense node provides continuous feedback regarding the X-ray exposure state to the control circuitry. This feedback mechanism allows the detector to monitor the actual exposure conditions in real-time and adjust its operation accordingly, reducing the risk of false positives (detecting exposure when none occurs) and false negatives (missing actual exposure events) while maintaining high image capture efficiency.
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 the digital radiographic detector to accurately sense the beginning and end of X-ray exposure, improving image capture efficiency and reducing false positives and negatives by allowing independent operation of the imaging array.
Implementation Method 1
a sense node capacitively coupled to the floating node of the photo-sensor that is sensed to determine the start, stop and temporal profile of the exposure of the sensor to X-rays
Implementation Method 2
an array of photosensors over the dielectric layers for generating charges in response to photons impacting the photosensors
Data Source
AI summary
A radiographic energy detecting pixel generates charges in a photosensor in response to photon impacts. A switch electrically connected to the photosensor selectively transmits collected charges to a data line. A sensing circuit electrically connected to the photosensor detects a rate of accumulation of the charges in the photosensor.