Rotary Shield Backscatter Imaging Collimation
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Solution Overview
Problem
Conventional backscatter imaging devices face issues with complex scanning mechanisms, X-ray leakage hazards, non-uniform scanning, mechanical complexity, and compatibility with conventional X-ray tubes, leading to geometric deformations and increased costs.
Innovation Solution
A scanning device using a novel 'flying-spot' formation mechanism with a stationary shield plate and a rotatable rotary shield body, featuring a linear slit and spiral slits, which allows for controlled radiation beam scanning and collimation hole formation, enabling uniform scanning and compatibility with conventional X-ray tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rotary shield body with multiple collimation holes is used for scanning, then radiation beam scanning is achieved, but the mechanism becomes complex and X-ray leakage occurs
Solution Approach 1:
The shield body is divided into a stationary shield plate and a rotary shield body, with the radiation source positioned between them. This segmentation allows the stationary plate to provide stable shielding while the rotary body enables scanning, reducing overall system complexity and improving shielding effectiveness.
Solution Approach 2:
The radiation source is positioned as an intermediary between the stationary shield plate and the rotary shield body. This arrangement allows the source to be accessed by both shielding components, enabling the formation of collimation holes without requiring the source to be inside the rotating component, thus simplifying the mechanism.
2Area of stationary object
If non-uniform scanning is performed with accelerating rays, then scanning coverage is achieved, but geometric deformation and longitudinal compression occur
Solution Approach 1:
The system transitions from non-uniform scanning with accelerating rays to uniform scanning at constant velocity. The rotary shield body rotates at a constant speed, ensuring that the radiation beam scans the subject at a uniform rate, thereby eliminating geometric deformation and longitudinal compression in the resulting images.
3Ease of operation
If translational movement of the ray scanning sector is performed, then second dimension scanning is achieved, but mechanical complexity increases
Solution Approach 1:
Instead of translating the ray scanning sector in the second dimension, the system uses rotation of the rotary shield body to achieve scanning in multiple dimensions. The rotary shield body with its specifically positioned collimation holes enables two-dimensional scanning through rotational motion alone, significantly reducing mechanical complexity.
4Ease of operation
If rotation motion of the ray scanning sector is performed, then second dimension scanning is achieved, but rotational inertia causes wear and breakdown
Solution Approach 1:
The shielding system is segmented into stationary and rotary components, with the radiation source positioned between them. This allows the rotary shield body to have reduced mass and rotational inertia compared to rotating the entire ray scanning sector, thereby reducing wear on bearings and improving reliability.
5Volume of moving object
If the radiation source is disposed inside the rotary radiation body, then compact arrangement is achieved, but compatibility with conventional X-ray tubes is lost
Solution Approach 1:
The radiation source is positioned as an intermediary between the stationary shield plate and the rotary shield body, rather than inside the rotary body. This arrangement maintains compatibility with conventional X-ray tubes while achieving compact integration through the interplay of the two shield components.
Solution Approach 2:
Instead of placing the radiation source inside the rotary body, the invention inverts the arrangement by positioning the source between the stationary and rotary shields. This inversion allows the use of conventional X-ray tubes while maintaining the scanning functionality.
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 solution provides a simplified scanning mechanism, reduces X-ray leakage, achieves uniform scanning, and lowers costs by allowing for interchangeable rotary shield bodies and easy integration with conventional X-ray tubes, resulting in improved image quality and reduced mechanical stress.
Implementation Method 1
a radiation source; and a stationary shield plate and a rotary shield body positioned respectively between the radiation source and a subject to be scanned
Implementation Method 2
an imaging technology using radiation beam for backscattering. Where backscatter imaging is employed, a subject to be inspected is scanned by radiation beam, i.e. a pencil beam, simultaneously the detector receives signal representative of radiation scattered back from the subject
Data Source
AI summary
Disclosed is a scanning device using radiation beam for backscatter imaging. The scanning device includes a radiation source; a stationary shield plate and a rotary shield body positioned respectively between the radiation source and the subject to be scanned, wherein the stationary shield plate is fixed relative to the radiation source, and the rotary shield body is rotatable relative to the stationary shield plate. The ray passing area permitting the rays from the radiation source to pass through the stationary shield plate is provided on the stationary shield plate, and ray incidence area and ray exit area are respectively provided on the rotary shield body. During the process of the rotating and scanning of the rotary shield body, the ray passing area of the stationary shield plate intersects consecutively with the ray incidence area and the ray exit area of the rotary shield body to form scanning collimation holes. Further, a scanning method using radiation beam for backscatter imaging is also provided.