PET Detector Reconstruction Using Virtual Detector Regions
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Solution Overview
Problem
Conventional PET apparatuses face limitations in spatial and temporal resolution due to identifying light emission positions in units of scintillator pieces, leading to theoretical limits in Time Of Flight (TOF) temporal resolution and spatial resolution.
Innovation Solution
Employing a monolithic scintillator and a Floating Edge LOR scheme in a PET apparatus, which allows for data acquisition in a real number coordinate system, enabling the determination of virtual detector regions and conversion of light emission points into virtual detector regions for enhanced image reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emission positions are identified in units of scintillator pieces, then the device structure is simple and ease of manufacture is improved, but spatial resolution and temporal resolution deteriorate
Solution Approach 1:
The scintillator is divided into multiple scintillator pieces, each detected by independent photodetectors. This segmentation allows simple manufacturing and assembly while the patent overcomes the resolution limitation through computational methods that process signals from multiple segmented elements to reconstruct precise light emission positions.
Solution Approach 2:
The patent transitions from discrete scintillator piece identification to continuous spatial coordinate identification. By using multiple photodetectors arranged in arrays and applying computational algorithms, the system determines light emission positions in continuous three-dimensional space rather than discrete grid positions, thereby achieving higher spatial resolution.
2Device complexity
If light emission positions are identified in units of scintillator pieces, then the device structure is simple, but TOF temporal resolution deteriorates with a theoretical limit of approximately tens of ps
Solution Approach 1:
Multiple photodetectors are segmented and arranged in arrays to detect light from different positions and angles. This segmentation enables the system to use light arrival time differences across multiple detectors to calculate precise emission positions through computational methods, achieving high temporal resolution without requiring extremely fast single-detector response.
Solution Approach 2:
The patent introduces computational algorithms as an intermediary between light detection and position determination. Instead of directly measuring position from single-detector signals, the system uses computational processing of time-of-flight data from multiple detectors to indirectly determine precise emission positions, overcoming the temporal resolution limit of individual detectors.
3Measurement precision
If a monolithic scintillator and Floating Edge LOR scheme are employed, then spatial resolution and temporal resolution are improved, but device complexity increases
Solution Approach 1:
The patent employs a monolithic scintillator that enables continuous three-dimensional position measurement rather than discrete grid-based measurement. Combined with the Floating Edge LOR scheme that uses multiple photodetector arrays, the system achieves continuous spatial coordinate identification in three dimensions, significantly improving spatial resolution despite increased device complexity.
Solution Approach 2:
The patent changes the detection parameter from discrete scintillator piece identification to continuous light emission position identification. By using a monolithic scintillator with multiple photodetector arrays and applying the Floating Edge LOR computational scheme, the system measures position as continuous parameters rather than discrete indices, achieving superior spatial and temporal resolution.
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 overcomes the theoretical limits of conventional PET apparatuses, enabling higher spatial and temporal resolutions, potentially achieving a 10-ps TOF temporal resolution and 1.5-mm spatial resolution.
Implementation Method 1
a PET detector 3 capable of detecting, in a real number coordinate system, a light emission position of an event occurring due to pair annihilation gamma rays becoming incident
Data Source
AI summary
A Positron Emission Tomography (PET) apparatus according to an embodiment includes processing circuitry. The processing circuitry is configured to determine a virtual detector region on the basis of a Positron Emission Tomography (PET) detector capable of detecting, in a real number coordinate system, a light emission position of an event occurring due to pair annihilation gamma rays becoming incident, a Line Of Response (LOR) defined based on the event detected by the PET detector, and the light emission position and is configured to perform a reconstruction process on the basis of the virtual detector region.