Integrated CT Slab Phantom Positioning for Faster 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 handling and alignment of multiple slabs of different materials and densities, which are cumbersome and take up storage space.
Innovation Solution
An integrated phantom system where slab phantoms are stored within the gantry, allowing them to be automatically moved into and out of the X-ray beam based on calibration protocols, reducing manual handling and optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple slab phantoms of different materials and densities are manually handled and aligned 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 segmented into multiple individual slabs that can be independently positioned. Each slab can be selectively moved into the beam path based on the specific calibration protocol requirements, allowing automated selection and placement of the correct phantom materials and densities without manual handling of complete phantom assemblies.
Solution Approach 2:
The system incorporates automated positioning mechanisms that enable the slabs to self-position into the correct locations within the beam path. The automated slab positioning system eliminates the need for manual alignment by operators, reducing human error and calibration time while maintaining precise positioning accuracy.
2Adaptability or versatility
If multiple slab phantoms are stored externally, then all phantom types are available for calibration, but they take up storage space and are cumbersome to handle
Solution Approach 1:
Multiple slabs are stored in a nested or stacked configuration within the housing structure. The slabs are arranged vertically or in layers, allowing compact storage of multiple phantom types within the gantry space. This nesting approach provides versatile phantom selection while minimizing external storage requirements and improving handling convenience through automated retrieval.
Solution Approach 2:
The system transitions from horizontal/external storage to vertical/integrated storage within the gantry housing. By utilizing the vertical dimension and integrating storage within the existing gantry structure, the system accommodates multiple phantom types without increasing external footprint, making the system more compact and easier to operate.
3Measurement precision
If physical phantoms are used for calibration, then accurate tissue density simulation is achieved, but the physical footprint and storage requirements increase
Solution Approach 1:
Multiple phantom slabs are nested within the gantry housing structure, utilizing vertical space and internal volume efficiently. This allows the system to maintain physical phantoms for accurate tissue density simulation while minimizing the external storage footprint by integrating the phantoms into the existing gantry volume rather than requiring separate storage facilities.
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 approach reduces the time and effort required for calibration, enhances accuracy by automating phantom placement, and minimizes the physical footprint of the slabs, thereby improving the efficiency and precision of CT system calibration.
Implementation Method 1
an electron beam generated by a cathode is directed towards a target within an X-ray tube. 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. The slab phantom set comprises at least one slab phantom configured to simulate varying human tissue densities
Data Source
AI summary
Various methods and systems are provided for a slab phantom set of an imaging system. The imaging system comprises a gantry including a radiation source and a detector. A housing s further positioned in the gantry, adjacent to the radiation source. The housing includes a slab phantom set that comprises at least one slab phantom. 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 of a radiation beam between the radiation source and the detector.