Modular SPECT-Compton Camera for Wider Photon Energy Imaging
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Solution Overview
Problem
Current SPECT imaging systems are limited by low-energy photon emissions and lack the flexibility and scalability required for practical use in clinical settings, while Compton imaging systems have not been effectively integrated into commercial medical imaging platforms.
Innovation Solution
A modular multi-modality imaging system using modules with catcher and scatter detectors, allowing for selectable photoelectric and Compton effect detection, and a geodesic dome-like structure for flexible design and integration with existing imaging systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a parallel-hole collimator is used for SPECT imaging, then image quality can be maintained for low-energy photons, but the system is limited to low-energy photon emitting isotopes and cannot image higher photon energies
Solution Approach 1:
The collimator is segmented into multiple layers with different hole orientations (first layer with first orientation, second layer with second orientation). This segmentation allows the system to maintain collimation effectiveness across a broader energy range while preserving image quality for low-energy photons.
Solution Approach 2:
The collimator uses composite structural design combining multiple layers with different orientations, creating a composite filtering system that selectively handles different photon energies through the layered geometric structure.
2Adaptability or versatility
If Compton imaging systems are constructed with scatter and catcher rings, then higher photon energies can be imaged, but the systems lack flexibility and scalability for practical clinical use
Solution Approach 1:
The imaging system is designed to perform multiple functions: it can operate in photoelectric mode for low-energy photons and Compton mode for higher-energy photons, eliminating the need for separate dedicated systems and improving flexibility for clinical applications.
Solution Approach 2:
The system dynamically selects between photoelectric and Compton detection modes based on the photon energy being imaged, allowing adaptive operation across different energy ranges and enhancing versatility for various clinical scenarios.
3Adaptability or versatility
If Compton imaging systems are constructed with scatter and catcher rings, then higher photon energies can be imaged, but the systems lack scalability for commercial deployment
Solution Approach 1:
The system is divided into modular components (collimator layers, detector modules) that can be independently manufactured and assembled, enabling scalable production and easier integration into existing commercial imaging platforms.
Solution Approach 2:
The multi-layer collimator structure nests filtering functions within a compact geometric arrangement, allowing the system to maintain functionality while reducing overall size and facilitating integration into commercial imaging systems with space constraints.
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
Enables imaging of higher photon energies and improved sensitivity and image quality, with modular design allowing integration into CT, MR, and PET systems, facilitating efficient manufacturing and servicing.
Implementation Method 1
detecting emissions from a radioisotope in the patient, these collimated SPECT systems are limited to low-energy photon emitting isotopes
Implementation Method 2
The Compton effect allows for imaging higher energies
Data Source
AI summary
A multi-modality imaging system allows for selectable photoelectric effect and/or Compton effect detection. The camera or detector is a module with a catcher detector. Depending on the use or design, a scatter detector and/or a coded physical aperture are positioned in front of the catcher detector relative to the patient space. For low energies, emissions passing through the scatter detector continue through the coded aperture to be detected by the catcher detector using the photoelectric effect. Alternatively, the scatter detector is not provided. For higher energies, some emissions scatter at the scatter detector, and resulting emissions from the scattering pass by or through the coded aperture to be detected at the catcher detector for detection using the Compton effect. Alternatively, the coded aperture is not provided. The same module may be used to detect using both the photoelectric and Compton effects where both the scatter detector and coded aperture are provided with the catcher detector. Multiple modules may be positioned together to form a larger camera, or a module is used alone. By using modules, any number of modules may be used to fit with a multi-modality imaging system. One or more such modules may be added to another imaging system (e.g., CT or MR) for a multi-modality imaging system.