Multilayer Detector Systems for Integrated PET and CT Imaging
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Solution Overview
Problem
Current medical and small animal imaging systems face challenges in integrating multiple imaging modalities effectively, leading to performance compromises and increased costs, particularly in combining PET and CT technologies without shared detectors or imaging spaces.
Innovation Solution
Development of advanced detector systems utilizing high-speed electronics and advanced detector materials for integrated Compton-PET and CT-Compton-PET imaging, incorporating multilayer detector designs with edge-on and face-on geometries, and varying detector materials to enhance spatial and temporal resolution, allowing for flexible configurations that can operate independently or simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple imaging modalities are integrated into a single system, then functionality and imaging capabilities are enhanced, but device complexity and cost increase
Solution Approach 1:
The patent combines PET and CT imaging modalities into a single integrated system that shares detectors and imaging space. The detector system is designed to simultaneously or separately perform both PET coincidence detection and CT x-ray detection, eliminating the need for separate physical systems and reducing overall complexity despite the enhanced functionality.
Solution Approach 2:
The detector system is designed with multi-functional capability to perform both PET and CT imaging functions. The same detector array can operate in coincidence mode for PET and in single-photon mode for CT, allowing a single device to serve multiple imaging purposes without requiring separate specialized detectors for each modality.
2Ease of manufacture
If PET and CT systems share detectors and imaging space, then costs are reduced, but performance compromises occur
Solution Approach 1:
The detector system employs different detector materials and configurations in different regions or layers to optimize performance for specific imaging tasks. By using materials with appropriate atomic numbers and densities in specific detector layers, the system can simultaneously achieve optimal sensitivity for PET gamma rays and appropriate attenuation characteristics for CT x-rays, maintaining high performance for both modalities.
Solution Approach 2:
The patent utilizes composite detector structures combining materials with different properties (such as scintillators coupled with photodetectors, or layered semiconductor materials) to achieve dual functionality. These composite structures enable the detector to respond appropriately to both gamma rays from PET isotopes and x-rays from the CT source, maintaining high performance for both imaging types while sharing the same physical detector array.
3Measurement precision
If separate PET and CT systems are used, then each system can be optimized for its specific modality, but registration errors occur and scan time increases
Solution Approach 1:
By integrating PET and CT detectors into a single co-located system, the patent eliminates the need for separate acquisitions and subsequent image registration. Both modalities acquire data from the same imaging space and coordinate system simultaneously, completely avoiding registration errors and significantly reducing total scan time compared to sequential separate acquisitions.
Solution Approach 2:
The integrated system enables continuous simultaneous acquisition of both PET and CT data during the same scan period. The detector operates in dual mode throughout the acquisition, allowing both imaging modalities to proceed concurrently without interruption or sequential delays, thereby eliminating time loss associated with separate acquisitions and post-processing registration.
4Adaptability or versatility
If different collimation and flux rate requirements are accommodated, then both modalities can function, but device complexity increases
Solution Approach 1:
The system employs dynamic configuration where the detector can switch between different operational modes (PET coincidence mode, CT single-photon mode, or hybrid mode) based on the imaging task. The collimation and flux rate parameters can be dynamically adjusted through software control and detector gating, allowing the same physical detector to accommodate the different requirements of PET and CT without requiring separate fixed collimation hardware for each modality.
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
The solution enables cost-effective, high-performance integrated imaging systems that improve spatial and temporal resolution, reduce registration errors, and enhance imaging capabilities across multiple modalities, including PET and CT, while maintaining flexibility for various applications.
Implementation Method 1
detector materials developed for human and small animal medical diagnostic imaging including diagnostic x-ray radiology, radiation therapy imaging, nuclear medicine imaging and PET imaging
Implementation Method 2
integrated Compton-PET and CT-Compton-PET radiation imaging
Data Source
AI summary
Detector designs and systems for enhanced radiographic imaging with integrated detector systems incorporate one or more of Compton and nuclear medicine imaging, PET imaging and x-ray CT imaging capabilities. Detector designs employ one or more layers of detector modules comprised of edge-on or face-on detectors or a combination of edge-on and face-on detectors which may employ gas, scintillator, semiconductor, low temperature (such as Ge and superconductor) and structured detectors. Detectors may implement tracking capabilities and may operate in a non-coincidence or coincidence detection mode.