Adjustable PET Detector Modules for High-Resolution Imaging
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Solution Overview
Problem
Current positron emission tomography (PET) systems are limited by low gamma-ray collection efficiency and poor spatial resolution, which are exacerbated by the challenge of positioning detectors close to patients without causing blurry images and non-uniform object sampling due to reduced object samplings and unknown depth of interaction (DOI) issues.
Innovation Solution
The development of a novel PET system architecture with adjustable detector modules that can be placed very close to the patient, incorporating high-performance detectors with improved spatial resolution and DOI capability, allowing for uniform sampling and adaptable field of view to accommodate different patient sizes and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detectors are positioned closer to the patient, then system sensitivity and spatial resolution are improved, but object sampling becomes non-uniform and image quality deteriorates
Solution Approach 1:
The detector array is designed to be movable relative to the patient, allowing dynamic adjustment of the detector-patient distance. The system can adapt the positioning based on patient size and imaging requirements, enabling close positioning for high resolution while maintaining uniform sampling through controlled movement and repositioning strategies.
Solution Approach 2:
The system changes the positioning parameter (detector-to-patient distance) dynamically rather than maintaining a fixed position. By adjusting this parameter based on patient anatomy and imaging needs, the system achieves optimal balance between proximity benefits (resolution) and sampling uniformity.
2Measurement precision
If detectors are positioned closer to the patient, then system sensitivity is improved, but depth of interaction blur increases
Solution Approach 1:
The system introduces an intermediary positioning mechanism that controls the detector-patient distance. By using movable detector arrays with precise positioning systems, the system acts as an intermediary between the need for close positioning (sensitivity) and the need to minimize DOI blur, allowing optimization of both factors through controlled positioning.
3Productivity
If detectors are positioned closer to the patient, then scanning time is reduced, but non-uniform sampling artifacts increase
Solution Approach 1:
The movable detector array enables dynamic scanning protocols where the detector positioning can be adjusted during the scan. This allows the system to maintain close positioning for speed while using repositioning strategies to ensure uniform sampling coverage, reducing artifacts while preserving scanning efficiency.
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 enhances system sensitivity and spatial resolution, reducing blur and non-uniform sampling, enabling sharper images and shorter scanning times with lower radioactive tracer doses.
Implementation Method 1
If a gamma-ray photon interacts inside one of the crystal elements, detectable scintillation photons are produced and propagate to photon sensors via reflections by crystal surfaces.
Data Source
AI summary
This invention provides a close-range positron emission tomography (PET) system, where the detector modules are able to be moved or placed very close to the patient compared to conventional PET systems. As a result, the sensitivity and resolution of the PET system is greatly increased.