Prismatoid Light Guide Array for PET Detector Resolution
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Solution Overview
Problem
Conventional PET systems face challenges with poor spatial resolution, edge and corner artifacts, and inefficient light sharing, which affect energy and depth-of-interaction (DOI) resolutions.
Innovation Solution
The development of a Prism-PET detector module with a scintillator array coupled to SiPM pixels and a segmented prismatoid light guide array, which redirects photons efficiently and confines light sharing to nearest SiPM neighbors, enhancing crystal identification and DOI resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform glass light guide is used, then the structure is simple and manufacturing is easy, but light sharing is inefficient and edge/corner artifacts occur
Solution Approach 1:
The uniform glass light guide is segmented into multiple prismatoid light guides, each with specific geometric shapes (prisms, pyramids, frustums) that redirect light photons to adjacent scintillator crystals. This segmentation enables controlled light sharing between crystals while eliminating edge and corner artifacts, thereby improving crystal identification resolution without significantly complicating manufacturing.
Solution Approach 2:
Different regions of the light guide are assigned different optical properties through the use of various prismatoid geometries. Edge and corner regions use prisms oriented to redirect light away from boundaries, while central regions use different configurations to optimize light sharing. This local differentiation improves measurement precision across the entire detector array.
2Device complexity
If conventional light sharing is used, then the structure is simple, but light is isotropically shared with Gaussian distribution causing signal degradation
Solution Approach 1:
The light sharing behavior is made non-uniform by implementing different prismatoid geometries in different spatial locations. Each prismatoid is designed to redirect light preferentially to specific adjacent crystals based on its local position, creating an anisotropic light sharing pattern that concentrates signal in the nearest neighbors rather than distributing it isotropically, thereby improving energy and DOI resolution.
Solution Approach 2:
The optical parameters of the light guide are changed from isotropic (uniform in all directions) to anisotropic (directional) by introducing prismatoid structures with specific orientations. This parameter change modifies the light propagation characteristics to achieve controlled light sharing that enhances signal integrity and measurement precision.
3Measurement precision
If more readout channels are added to improve crystal identification, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The prismatoid light guides are designed to automatically redirect light photons from scintillator crystals to their correct adjacent readout pixels based on geometric optics principles. This self-service mechanism eliminates the need for additional readout channels or complex electronic routing, as the optical structure itself performs the crystal identification function, maintaining device simplicity while improving measurement precision.
Solution Approach 2:
The prismatoid light guides act as optical intermediaries between the scintillator crystals and the readout pixels. They mediate the light transfer process by redirecting photons along controlled paths, enabling accurate crystal identification without requiring additional readout electronics. This intermediary approach decouples the crystal identification function from the readout channel complexity.
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 Prism-PET module achieves improved spatial resolution, energy resolution, and DOI resolution, reducing edge and corner artifacts and enabling up to 9-to-1 crystal-to-readout coupling without increasing the number of readout channels.
Implementation Method 1
a plurality of prismatoids provided on a top end of the scintillator array. Each prismatoid of the plurality of prismatoids is configured to redirect particles between top ends of crystals of the scintillator array
Implementation Method 2
a scintillator array comprising a plurality of scintillator crystals
Data Source
AI summary
Provided is a particle detection device and method of fabrication thereof. The particle detection device includes a scintillator array that includes a plurality of scintillator crystals; a plurality of detectors provided on a bottom end of the scintillator array; and a plurality of prismatoids provided on a top end of the scintillator array. Prismatoids of the plurality of prismatoids are configured to redirect particles between top ends of crystals of the scintillator array. Bottom ends of a first group of crystals of the scintillator array are configured to direct particles to a first detector of the plurality of detectors and bottom ends of a second group of crystals of the scintillator array are configured to direct particles to a second detector substantially adjacent to the first detector.