Limited Angle Time-of-Flight PET Scanner Design
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Solution Overview
Problem
Current whole-body PET scanners have limited spatial resolution and sensitivity, making them inadequate for detecting and quantifying small, early-stage tumors in breast cancer and other localized sites, such as the brain, prostate, or heart, due to their design and geometrical restrictions.
Innovation Solution
A dedicated time-of-flight positron emission tomography device with a detector array configured to accommodate specific body parts, offering high spatial resolution and sensitivity, utilizing scintillator crystals like lutetium oxyorthosilicate and lanthanum bromide, and a processor for three-dimensional image reconstruction with timing resolution of less than 600 ps, allowing for accurate detection and quantification of small lesions without detector rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated PET scanner with limited detector array coverage is used, then spatial resolution and sensitivity are improved, but the angular coverage is reduced
Solution Approach 1:
The patent applies time-of-flight information (adding a temporal dimension) to compensate for the reduced angular coverage in the spatial domain. By measuring the time difference of arrival of annihilation photons at detectors, the system can reconstruct images with high spatial resolution even when detectors cover only a limited angular range, thus resolving the contradiction between limited detector coverage and high spatial resolution
Solution Approach 2:
The patent changes the timing resolution parameter to less than 600 ps, which enables accurate time-of-flight measurements. This parameter improvement allows the system to achieve high spatial resolution and sensitivity with a reduced detector array, as the temporal information compensates for the reduced spatial/angular coverage
2Measurement precision
If a dedicated PET scanner with smaller ring diameter is used, then sensitivity is improved, but the scanner complexity increases
Solution Approach 1:
The patent divides the detector array into multiple segments that can be independently positioned and configured. This segmentation allows the system to achieve high sensitivity with a smaller effective ring diameter while managing complexity through modular design, as each segment can be optimized independently rather than requiring a complete redesign of the entire scanner system
Solution Approach 2:
The patent designs the detector segments to be multi-functional, serving both as coincidence detection elements and as time-of-flight measurement devices. This universality reduces overall system complexity by combining multiple functions into single components, thereby improving sensitivity without proportionally increasing scanner complexity
3Measurement precision
If time-of-flight measurement with high timing resolution is implemented, then image quality is improved, but the device complexity increases
Solution Approach 1:
The patent specifies a timing resolution parameter of less than 600 ps, which is achievable with conventional photodetector technology. By setting this specific parameter threshold, the system achieves high image quality through time-of-flight information while avoiding the need for ultra-fast detectors that would significantly increase device complexity and cost
4Adaptability or versatility
If clinical whole-body PET scanners are used for breast imaging, then versatility is maintained, but spatial resolution and sensitivity are insufficient
Solution Approach 1:
The patent segments the imaging system into dedicated modules that can be configured for specific body parts. This segmentation allows the system to optimize spatial resolution and sensitivity for breast imaging while maintaining the ability to adapt to other imaging applications, thus preserving versatility while improving measurement precision for targeted applications
Solution Approach 2:
The patent applies local quality optimization by configuring detector segments with specific properties (such as crystal type, geometry, and positioning) that are optimized for breast imaging. This local optimization improves spatial resolution and sensitivity for the target application while the overall system maintains versatility through its modular, reconfigurable architecture
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 provides high-quality images with improved spatial resolution and sensitivity, enabling the detection and quantification of small tumors, reducing scan times and costs, and integrating with multi-modality imaging for enhanced diagnostic accuracy.
Implementation Method 1
utilizing scintillator crystals like lutetium oxyorthosilicate and lanthanum bromide
Implementation Method 2
time-of-flight positron emission tomography device with a detector array configured to accommodate specific body parts, offering high spatial resolution and sensitivity, utilizing scintillator crystals like lutetium oxyorthosilicate and lanthanum bromide, and a processor for three-dimensional image reconstruction with timing resolution of less than 600 ps
Data Source
AI summary
Provided are time-of-flight positron emission tomography devices comprising a detector array having at least two segments configured to accommodate a body part and to acquire tracer emission signals from a target within an imaging situs with a timing resolution of less than about 600 ps and a processor that receives the acquired signals from the detector array and converts the signals into a three dimensional image reconstruction of the target.