Flexible CT Detector Reducing Splicing Joints
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Solution Overview
Problem
Conventional CT detectors face issues with projection information loss and image discontinuity due to splicing joints, which hinder the improvement of spatial resolution and scanning range.
Innovation Solution
A flexible CT detector is designed using a flexible circuit board with a signal reading portion and a flexible conversion portion that absorbs and converts X-rays into a continuous projected image, reducing the need for splicing joints and minimizing information loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional rigid CT detector is used with multiple detector modules spliced together, then the scanning range can be covered, but splicing joints cause projection information loss and image discontinuity
Solution Approach 1:
The patent applies a flexible circuit board instead of a rigid detector structure. The flexible circuit board can be continuously arranged along the rotation trajectory of the CT scanner, forming a continuous detector arc without rigid splicing joints. This flexible structure eliminates the information loss caused by joint gaps while maintaining the required scanning range coverage.
Solution Approach 2:
The detector is divided into multiple detector units that can be independently manufactured and then continuously spliced together along the rotation trajectory. This segmentation allows for flexible arrangement of detector elements while maintaining continuity, resolving the contradiction between manageable module size and continuous coverage.
2Measurement precision
If the pixel size is reduced to improve spatial resolution, then more detector elements can be fitted in the same physical space, but projection information loss increases due to more splicing joints
Solution Approach 1:
The flexible circuit board enables continuous arrangement of detector elements along the rotation trajectory without rigid splicing joints. This allows for reduced pixel size to improve spatial resolution while avoiding the information loss that would result from multiple joint connections, as the flexible structure maintains continuity throughout the detector arc.
3Area of stationary object
If multiple detector modules are spliced to achieve full-ring coverage, then the scanning range is satisfied, but assembly accuracy requirements increase
Solution Approach 1:
The flexible circuit board can be continuously arranged and spliced along the rotation trajectory with smaller individual splicing joints. The flexible nature of the circuit board allows for better accommodation of assembly tolerances compared to rigid detectors, reducing the overall assembly accuracy requirements while still achieving full-ring coverage.
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
The flexible CT detector significantly reduces the number of splicing joints, thereby minimizing projection information loss and improving the imaging quality of static CT systems by maintaining a continuous projected image.
Implementation Method 1
a flexible conversion portion, mounted on an inner side of the flexible circuit board, to absorb an X-ray and convert the X-ray into a set signal
Implementation Method 2
the electron transport layer is mounted between an outer side of the X-ray absorption and conversion layer and the inner side of the flexible circuit board, to transport an electron and block a hole
Implementation Method 3
the hole transport layer is mounted on an inner side of the X-ray absorption and conversion layer to transport a hole and block an electron
Implementation Method 4
the common electrode layer is mounted on an inner side of the hole transport layer, the common electrode layer is connected to one electrode of the power supply, and the other electrode of the power supply is connected to the flexible circuit board, to form an electric field for driving movement of an electron hole pair
Data Source
AI summary
A flexible CT detector and a static CT system using same. The flexible CT detector comprises: a flexible circuit board (1), which is used for being attached onto the inner side of a CT rack (10) and has a signal reading portion; and a flexible conversion portion (2), which is attached onto the inner side of the flexible circuit board (1) and is used for absorbing an X-ray and converting same into a set signal, wherein the signal reading portion is used for receiving the set signal and outputting continuous and uninterrupted projection images. In the flexible CT detector, a large-area flexible circuit is used as a substrate of the detector, such that pixels of the whole ring of the detector are arranged closely, and the problems of splicing seams and projection information loss that are caused by the assembly of a traditional rigid detector are greatly reduced.