Straight Trajectory CT Device with Moving Collimator
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Solution Overview
Problem
Current straight trajectory CT devices are costly due to the use of numerous detectors and radiation guard components, limiting their spread and application.
Innovation Solution
A CT device design featuring a static ray generating unit and a moving first collimator that collaborates with a single ray receiving unit to achieve tomography scanning, reducing the need for multiple detectors and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of ray receiving units are provided on the straight track to receive the ray beam, then the imaging quality is improved, but the cost is increased dramatically
Solution Approach 1:
The patent makes the collimator movable along the straight track instead of using multiple static ray receiving units. The collimator dynamically changes position to define different beam angles, replacing the need for multiple detectors with a single moving component that achieves the same imaging quality through temporal rather than spatial multiplicity.
Solution Approach 2:
The patent segments the field of view angularly using the movable collimator with multiple collimating slits. Each slit corresponds to a specific angular range, and by moving the collimator to different positions, the system sequentially scans different angular segments of the object, reconstructing the full image from these segmented measurements.
2Measurement precision
If a large number of ray receiving units and radiation guard components are used, then the scanning accuracy is improved, but the device complexity is increased
Solution Approach 1:
The movable collimator serves multiple functions: it defines the beam angle through its position, acts as the aperture limiter through its slits, and enables angular scanning through its movement along the track. This single multi-functional component replaces what would otherwise require multiple specialized components including multiple detectors and separate guard structures.
Solution Approach 2:
The collimator acts as an intermediary between the fixed ray source and the fixed ray receiving unit. By positioning and orienting the collimator at different locations along the track, it mediates the angular relationship between source and detector, enabling the system to scan different angles without moving the source or detector themselves.
3Measurement precision
If multiple detectors are used to receive the ray beam, then the tomography imaging quality is improved, but the signal crosstalk and scattering are increased
Solution Approach 1:
The patent extracts and isolates the angular selection function into the movable collimator, separating it from the detection function performed by the fixed ray receiving unit. This extraction ensures that only rays within the specific angular range defined by the collimator's current position reach the detector, eliminating crosstalk from out-of-angle rays and reducing scattering effects.
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 design simplifies the CT device structure, reduces costs, and improves imaging precision by minimizing signal crosstalk and scattering, making it more portable and efficient.
Implementation Method 1
a ray generating unit for generating ray beam within a specific range of field angle... the ray beam generated by the ray generating unit is received by the ray receiving unit after penetrating the first collimator and the object to be inspected in order
Implementation Method 2
a first collimator for restraining the ray beam... at least one first collimating slit through which the ray beam passes is provided on the first collimator; the first collimating slit is ranging within the range of field angle
Data Source
AI summary
A straight trajectory CT device can be used in radiation imaging. The device includes: a ray-generating unit that generates a ray within a specific range of field angle; a channel for an object to be inspected though which the object to be inspected passes; a first collimator; and a ray receiving unit provided on both sides of the channel for the object to be inspected. The ray beam is received by the ray receiving unit after penetrating the first collimator and the object to be inspected in order. The ray generating unit is static and the first collimator moves in the same direction as the ray receiving unit. This direction is parallel to the channel for the object to be inspected. The device can complete computed tomography with a minimum of one ray receiving unit, thereby simplifying the structure of the device and reducing its cost.