ABALONE-PET Scanner Volumetric Detection Geometry
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Solution Overview
Problem
Traditional PET scanners are complex, costly, and have limited sensitivity, requiring high radioactive doses for effective scanning, leading to increased patient radiation exposure and prolonged examination times due to their ring configuration and reliance on outdated photomultiplier tube technology.
Innovation Solution
The development of the ABALONE-PET scanner, which employs large-area gamma-ray detector panels and photon detector panels that enclose the body for whole-body scanning in a single step, utilizing Geiger-mode Avalanche Photodiodes and scintillator materials to enhance detection efficiency and reduce radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional photomultiplier tube technology is used in ring-PET scanners, then the system can detect gamma rays, but the device complexity and cost increase significantly
Solution Approach 1:
The patent replaces traditional photomultiplier tube technology with a solid-state detector system consisting of scintillator crystals coupled to photodiode arrays. This substitution eliminates complex vacuum tube electronics and high-voltage requirements while maintaining gamma ray detection capability through the scintillation light conversion process
Solution Approach 2:
The solid-state detector modules serve multiple functions: gamma ray detection through scintillation, light conversion to electrical signals via photodiodes, and positional encoding through crystal geometry. This multi-functionality reduces the need for separate subsystems and simplifies overall system architecture
2Reliability
If traditional ring-PET scanners are used, then gamma ray detection is possible, but the sensitivity is limited requiring high radioactive doses
Solution Approach 1:
The patent transitions from two-dimensional ring detection geometry to three-dimensional volumetric detection using stacked layers of detector modules. This 3D configuration increases the solid angle of detection and improves sensitivity by detecting gamma rays from multiple angles simultaneously, reducing the required radioactive dose
Solution Approach 2:
The detector system uses composite scintillator crystal structures with varying densities and light emission characteristics. These composite materials optimize gamma ray absorption efficiency while maintaining light output for photodiode detection, enhancing overall detection sensitivity
3Reliability
If sequential scanning is used in ring-PET, then the scanner can image the body, but the examination time is prolonged
Solution Approach 1:
The patent implements continuous whole-body imaging by positioning the patient within a volumetric detector field rather than moving the patient through a ring aperture. All detector modules operate simultaneously to capture gamma rays from the entire body, enabling continuous acquisition without sequential positioning steps
4Area of stationary object
If large-area detector panels are used, then the detection coverage is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent divides large-area detector panels into modular segments consisting of standardized detector modules. Each module contains a scintillator crystal array coupled to photodiode circuits, and modules can be independently manufactured and then assembled into large-area configurations, simplifying production and quality control
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 ABALONE-PET scanner significantly increases scanning sensitivity, reduces patient radiation doses by up to 80 times, and shortens examination time, while being more cost-effective and less complex than traditional systems, enabling more efficient and safer whole-body PET scans.
Implementation Method 1
utilizing Geiger-mode Avalanche Photodiodes and scintillator materials to enhance detection efficiency
Implementation Method 2
utilizing Geiger-mode Avalanche Photodiodes and scintillator materials to enhance detection efficiency
Implementation Method 3
utilizing Geiger-mode Avalanche Photodiodes
Data Source
AI summary
A large area position-sensitive single-photon detector and radiation detector is described. Photon detectors are coupled to a large area panel configured with an equipotential feedthrough chamber that operates in combination with a photocathode of a hemispherical window to provide electrostatic focusing for the photoelectrons. The panels can be assembled into an enveloping structure, such as a PET scanner, which is globally and/or locally curved, such as into a sphere, ovoid, elongated cylinder, or similar structure providing significant sensitive surface surrounding an object, such as a patient being scanned in a medical positron emission tomography (PET) scanner. Increased sensitivity is provided in response to registering radiation by surrounding the patient, so that reduced patient radiation dosing levels are required.