X-ray detector cell grouping for readout speed and wiring density
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Solution Overview
Problem
Existing X-ray computed tomography apparatuses face challenges in achieving high-resolution data acquisition due to technical difficulties in implementing simultaneous readout schemes with high-density signal wiring lines and large contact areas, which hinder the reduction of detector cell size and result in loss of simultaneity in integration time in sequential readout schemes.
Innovation Solution
The X-ray computed tomography apparatus employs a configuration where detector cells are grouped and connected to through electrodes via switches, allowing for simultaneous readout in standard resolution mode and sequential readout in high-resolution mode, with through electrodes positioned outside the cell groups to maintain effective cell areas and reduce signal wiring density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If simultaneous readout scheme is used with high-resolution detector, then high-speed readout and simultaneity in integration time are achieved, but signal wiring density becomes high and cell size cannot be reduced
Solution Approach 1:
The detector is divided into multiple detector groups, where each group shares common signal wiring lines and through-electrodes. This segmentation reduces the overall wiring density while maintaining simultaneous readout capability within each group, resolving the contradiction between high-speed readout and signal wiring complexity.
Solution Approach 2:
Multiple detector cells within each detector group share common signal wiring lines and through-electrodes. By merging the wiring resources for multiple cells, the signal wiring density is reduced while still achieving simultaneous readout for all cells in the group, thus resolving the contradiction between readout speed and wiring complexity.
2Area of moving object
If sequential readout scheme is used, then cell size can be reduced, but simultaneity in integration time between detector cells collapses
Solution Approach 1:
The system dynamically switches between two operational modes: simultaneous readout mode for standard resolution imaging and sequential readout mode for high-resolution imaging. This dynamic adaptability allows the system to optimize between cell size and integration time simultaneity based on the specific imaging requirements, resolving the contradiction between these two parameters.
3Reliability
If through electrode contact area is increased for direct connection, then connection reliability is improved, but effective cell area is reduced
Solution Approach 1:
The through-electrodes are extracted and positioned outside the detector cell groups rather than being embedded within each cell. This separation allows the through-electrodes to maintain reliable connections while occupying minimal space within the detector area, thus preserving the effective detector cell area while ensuring connection reliability.
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 enables both standard and high-resolution data acquisition while maintaining effective cell areas and simultaneity in integration time, improving the apparatus's capability to perform dual-mode imaging.
Implementation Method 1
a photodiode 61 as a detector cell 61, the photodiode 61 being a direct conversion type that directly converts incident light into an electrical signal
Data Source
AI summary
According to an embodiment, detector cells are provided on a substrate, divided into groups, and detect an X-rays. Switches respectively connected to the detector cells. The data acquisition elements are respectively connected to the groups and configured to integrate electrical signals from a detector cells belonging to each of the groups. The control circuitry are configured to control the switches for each of the groups so as to switch between first connection for substantially simultaneously reading out electrical signals from a detector cells belonging to each of the groups and second connection for reading out electrical signals from a detector cells belonging to each of the groups at different timings.