X-ray Detector DAS Shielding for CT Reliability
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Solution Overview
Problem
X-ray detectors and Data Acquisition Systems (DAS) in X-ray computed tomography apparatuses are prone to breakdown due to long-term exposure to X-rays, as electronic components within the DAS are not resistant to radiation, leading to system failure.
Innovation Solution
The integration of X-ray shielding plates and a multilayer board structure within the DAS, where X-ray shielding plates are strategically positioned to prevent X-rays from reaching electronic parts, while allowing for the formation of wiring patterns between the X-ray detector and the DAS to extract electrical signals, thereby protecting the DAS from radiation damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the DAS is placed inside the gantry to integrate the X-ray detector and DAS, then the device complexity is reduced and signal transmission is improved, but the electronic parts are exposed to X-rays causing breakdown
Solution Approach 1:
The board is divided into a first board and a second board, with the first board positioned in the X-ray transmission path and the second board positioned outside the path. This segmentation allows signal extraction close to the detector while protecting electronic parts from X-ray exposure, resolving the contradiction between integration benefits and reliability.
Solution Approach 2:
A signal cable connects the first board (exposed to X-rays) to the second board (protected from X-rays). The signal cable acts as an intermediary, allowing electrical signals to be transmitted from the detector region to the protected electronic parts region, enabling integration while maintaining reliability.
2Reliability
If the DAS is placed outside the X-ray transmission path to protect electronic parts, then the reliability is improved, but the device complexity increases and signal transmission distance increases
Solution Approach 1:
The board is segmented into two parts positioned at different locations relative to the X-ray path. This allows the system to benefit from both proximity to the detector (reducing signal transmission distance) and protection from X-rays (improving reliability), while the segmented structure itself manages the device complexity.
Solution Approach 2:
The first and second boards are electrically connected to form an integrated signal processing system. This merging combines the advantages of close detector coupling with protected electronic components, achieving both low complexity and high reliability in the overall system.
3Reliability
If signal cables are used to connect the X-ray detector and DAS, then the electronic parts can be protected from X-rays, but noise is introduced and costs increase
Solution Approach 1:
The signal extraction point is taken out from the protected region (second board) and extended to the X-ray exposed region (first board) through the signal cable. This allows the majority of the signal path to be outside the X-ray field (reducing noise) while only the necessary portion near the detector is exposed.
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 configuration effectively shields electronic components from X-rays, preventing system failure, reducing noise, and enabling modular expansion and repair of the X-ray computed tomography apparatus, while also eliminating the need for signal cables, which reduces noise and costs.
Implementation Method 1
a plurality of X-ray shielding plates 62 are provided for the board 60 so as to prevent electronic parts 80 from being exposed to X-rays
Implementation Method 2
an X-ray detector 50 which detects X-rays and generates an electrical signal corresponding to the detected X-rays
Data Source
AI summary
According to one embodiment, detector and DAS includes an X-ray detector, a board, a DAS, and a plurality of X-ray shielding plates. The X-ray detector detects X-rays and generates an electrical signal corresponding to the detected X-rays. The board is coupled to the X-ray detector and includes a wiring pattern to extract the electrical signal from the X-ray detector. The DAS is coupled to the board and included an electronic part to perform signal processing for the electrical signal. The X-ray shielding plates are provided for the board to prevent the electronic part from being exposed to X-rays transmitted through the X-ray detector. A portion of the wiring pattern is placed between the X-ray shielding plates.