Staggered Charge Reading in Stacked Radiation Detectors
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Solution Overview
Problem
In radiography apparatuses with two radiation detectors, reading charge from one detector causes electrical noise in the other, leading to suboptimal image capture as one detector is typically turned off during operation.
Innovation Solution
A radiography apparatus with two radiation detectors and control units that stagger the reading of charge accumulation, allowing one detector to read while the other is in a sleep state or completing its read cycle, reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If charge is read from one radiation detector, then image data is obtained, but electrical noise is generated in the other radiation detector
Solution Approach 1:
The patent implements periodic action by alternating between reading operations of the first and second radiation detectors. The control unit performs reading of the first detector, then the second detector, creating a periodic cycle that prevents simultaneous reading operations and thus eliminates electrical noise interference while ensuring both detectors can acquire and transmit image data
2Object-affected harmful factors
If one radiation detector is turned off to reduce noise, then noise influence is reduced, but only one detector can capture images at a time
Solution Approach 1:
The patent applies preliminary action by having both radiation detectors accumulate charge simultaneously during the imaging period. The reading operations are staggered, with one detector being read while the other continues accumulating charge. This ensures both detectors are prepared with image data before reading begins, maximizing productivity while minimizing noise through sequential reading
3Loss of information
If both radiation detectors read charge simultaneously, then image data is obtained from both, but electrical noise interferes with the other detector
Solution Approach 1:
The patent applies segmentation by dividing the reading operation into separate, sequential phases for each radiation detector. Instead of simultaneous reading, the control unit segments the reading process into distinct time windows where the first detector is read during one phase and the second detector is read during another phase. This temporal segmentation eliminates electrical noise interference while ensuring both detectors contribute image data
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 minimizes noise influence during charge reading and image data transmission, enhancing the quality of radiographic images captured by both detectors.
Implementation Method 1
a first radiation detector that includes a plurality of pixels accumulating charge corresponding to emitted radiation; a second radiation detector that is provided so as to be stacked on a side of the first radiation detector opposite to a side on which the radiation is incident and includes a plurality of pixels accumulating charge corresponding to the emitted radiation
Data Source
AI summary
A radiography apparatus includes: a first radiation detector that includes plural pixels accumulating charge corresponding to emitted radiation; a second radiation detector that is stacked on a side of the first radiation detector opposite to a side on which the radiation is incident and includes plural pixels accumulating charge corresponding to the emitted radiation; a first control unit that performs control for reading the charge accumulated in the pixels of the first radiation detector while the charge is accumulated in the pixels of the first radiation detector and the second radiation detector; and a second control unit that starts control for reading the charge accumulated in the pixels of the second radiation detector while the charge is accumulated in the pixels of the first radiation detector and the second radiation detector at a time different from a time when the first control unit starts the control.