Variable PET Apparatus Detector Module Dynamics
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Solution Overview
Problem
Current PET apparatuses face limitations in providing optimal image quality due to fixed geometry, which affects sensitivity and resolution, and are unable to efficiently adapt to varying cross-sectional diameters of subjects without additional devices or increased cost.
Innovation Solution
A variable PET apparatus with gantries and detection modules that can change configuration in both transverse and longitudinal directions, allowing for a detection ring arrangement that maintains a circular shape, enabling adaptation to different subject diameters through radial expansion, contraction, and translational motion, thereby optimizing sensitivity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed geometry PET apparatus is used, then the structure is simple and cost-effective, but the sensitivity and resolution are compromised when imaging subjects with varying cross-sectional diameters
Solution Approach 1:
The detection modules are configured to be movable along the longitudinal axis, transforming the fixed geometry PET apparatus into a dynamic system. This allows the detection ring diameter to be adjusted according to the cross-sectional diameter of the subject, improving adaptability without requiring multiple separate apparatuses. The movable configuration enables the system to optimize its geometry for different imaging scenarios while maintaining a single apparatus structure.
2Measurement precision
If the detection ring diameter is reduced for small subjects, then the spatial resolution and sensitivity improve, but the apparatus cannot accommodate larger subjects
Solution Approach 1:
The detection modules can move along the longitudinal axis to adjust the detection ring diameter dynamically. When imaging small subjects, the modules move closer to reduce the diameter and improve spatial resolution and sensitivity. When imaging larger subjects, the modules move apart to increase the diameter, thereby accommodating a wider range of subject sizes while optimizing image quality for each specific case.
Solution Approach 2:
The system changes the geometric parameter (detection ring diameter) based on the subject size. By adjusting the position of detection modules along the longitudinal axis, the apparatus modifies its effective diameter to match the cross-sectional diameter of the subject, thereby optimizing spatial resolution and sensitivity for each imaging scenario.
3Measurement precision
If multiple PET apparatuses with different diameters are provided, then the optimal image quality can be achieved for different subject sizes, but the cost and space requirements increase
Solution Approach 1:
A single PET apparatus is designed with multi-functionality to serve multiple imaging purposes. The detection modules can adjust their positions along the longitudinal axis, enabling the same apparatus to optimize its detection ring diameter for different subject sizes. This eliminates the need for multiple separate apparatuses while maintaining optimal image quality across various imaging scenarios, thereby reducing cost and space requirements.
Solution Approach 2:
The dynamic adjustment capability of the detection modules allows one apparatus to replace multiple fixed-diameter apparatuses. By moving the detection modules to different positions, the system can adapt its geometry to match the requirements of different subject sizes, providing the functionality of multiple apparatuses through a single versatile system.
Data Source
AI summary
A variable PET apparatus allows structural changes of detector modules in transversal and longitudinal directions to correspond to various imaging purposes and a cross-sectional diameter of a subject while maintaining an arrangement of the detector modules to be close to a true circle. The variable PET apparatus includes: a gantry having an opening on a longitudinal axis; and detector modules supported on the gantry and arranged a predetermined distance apart from each other such that a detection ring is configured with a diameter in a circumferential direction, wherein the gantry is driven by a gantry drive member, and the detector modules are driven by a detector module drive member. According to the present invention, structural changes of the detector modules in the PET apparatus is possible to correspond to a cross-sectional diameter of a subject without additional devices, thereby improving the spatial resolution and sensitivity.