Prismatoid Light Guide for PET Detector DOI Resolution
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Solution Overview
Problem
Conventional PET detector systems with single-sided readout techniques suffer from suboptimal depth-of-interaction (DOI) resolution due to inefficient light sharing between scintillator crystals, which limits their feasibility for clinical use.
Innovation Solution
The use of a prismatoid light guide, which redirects light between adjacent scintillators, enhances light sharing and improves DOI resolution by allowing precise identification of which scintillator columns share light, thereby increasing system-level count rate and uniformity of Anger logic centroiding resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flat, uniform reflective light guide is used to redirect light in single-sided readout, then system complexity is reduced compared to double-sided readout, but DOI resolution deteriorates to ~5 mm FWHM
Solution Approach 1:
The patent applies local quality by transitioning from a uniform light guide to a non-uniform light guide with varying refractive index or thickness. This creates spatially differentiated light redirection properties, where different regions of the light guide redirect light to different degrees, enabling improved DOI resolution while maintaining single-sided readout simplicity.
Solution Approach 2:
The patent changes physical parameters of the light guide, specifically the refractive index or thickness, to optimize light sharing between scintillator crystals. By varying these parameters across the light guide structure, the system achieves better DOI resolution without requiring double-sided readout complexity.
2Device complexity
If multiple scintillator crystals are coupled to single readout pixels to reduce system cost, then device complexity is reduced, but light sharing efficiency deteriorates
Solution Approach 1:
The patent introduces a non-uniform light guide as an intermediary between scintillator crystals and readout pixels. This intermediary structure actively manages light distribution, ensuring efficient light sharing among multiple scintillators coupled to single pixels, thereby maintaining reliability while reducing system complexity.
3Ease of manufacture
If conventional uniform light guides are used with high aspect ratio scintillators, then manufacturing is simplified, but DOI resolution deteriorates due to poor light sharing
Solution Approach 1:
The patent implements local quality by creating a light guide with spatially varying properties (refractive index or thickness) rather than uniform characteristics. This localized differentiation enables effective light sharing across high aspect ratio scintillators, improving DOI resolution while remaining manufacturable through techniques like variable thickness deposition or refractive index grading.
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 prismatoid light guide significantly improves DOI resolution and spatial resolution of PET detector systems, achieving enhanced light sharing and more uniform localization performance across the detector array, making single-sided readout techniques more viable for clinical applications.
Implementation Method 1
a prismatoid provided on a second end of the scintillator, with the prismatoid configured to redirect light between a first pair of adjacent scintillators of the plurality of scintillators
Data Source
AI summary
Provided are a device for detecting sub-atomic particles and method of fabrication thereof. The device includes a plurality of scintillators, a detector provided on a first end of the plurality of scintillators and a prismatoid provided on a second end of the plurality of scintillators. The prismatoid redirects light between adjacent scintillators of the plurality of scintillators.