Integrated Slab Phantom Assembly for Accurate CT Calibration
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Solution Overview
Problem
Calibration of computed tomography (CT) systems using slab phantoms is time-consuming and prone to human error due to the physical misalignment and cumbersome handling of multiple slabs of different materials and densities, which affects image quality and accuracy.
Innovation Solution
An integrated phantom system where slab phantoms are stored within the gantry, allowing for automated movement into and out of the X-ray beam based on calibration protocols, reducing manual handling and improving alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple slab phantoms of different materials and densities are manually handled during calibration, then calibration can be performed, but the process becomes time-consuming and prone to human error
Solution Approach 1:
The phantom system is divided into multiple individual slab phantoms of different materials and densities, each capable of independent movement. This segmentation allows selective positioning of only the required slabs during calibration, eliminating the need to handle complete phantom assemblies and significantly reducing calibration time and potential for error.
Solution Approach 2:
The slab phantoms are designed with movable mechanisms that allow dynamic repositioning during calibration procedures. The ability to move individual slabs into or out of the calibration path enables rapid configuration changes without manual reassembly, directly addressing the time-consuming nature of traditional phantom handling.
2Measurement precision
If multiple slab phantoms are physically handled and positioned, then calibration data can be collected, but physical misalignment occurs reducing accuracy
Solution Approach 1:
The movable slab phantom system enables automatic self-positioning during calibration. The slabs can be independently actuated into predetermined positions without requiring manual alignment by operators, eliminating human error in positioning and ensuring consistent, accurate alignment for calibration measurements.
3Ease of operation
If slab phantoms are stored externally, then they are accessible, but the physical footprint and handling complexity increase
Solution Approach 1:
The slab phantom storage and positioning system is merged with the CT gantry structure itself. By integrating the phantom slabs into the existing gantry framework, the system eliminates separate external storage requirements and complex manual handling procedures, reducing both physical footprint and operational complexity while maintaining easy accessibility during calibration.
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 solution reduces the time and effort required for calibration, enhances the accuracy of CT system calibration, and minimizes the physical footprint of the phantom slabs, thereby improving image quality and efficiency.
Implementation Method 1
A fan-shaped or cone-shaped beam of X-rays produced by electrons colliding with the target is directed toward a subject
Implementation Method 2
After being attenuated by the object, the X-rays impinge upon an array of radiation detector elements
Data Source
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AI summary
Various methods and systems are provided for a slab phantom set of an imaging system. The imaging system (200) comprises a gantry (322) including a radiation source (302) and a detector (314). A housing (306) is further positioned in the gantry, adjacent to the radiation source. The housing includes a slab phantom set (304) that comprises at least one slab phantom (324, 326). The slab phantom set is configured such that at least one slab phantom of the slab phantom set is independently movable to enable one or more of the at least one slab phantom of the slab phantom set is to be selectively positioned in a path (312) of a radiation beam (308) between the radiation source and the detector.