PET Brain Imaging Detector Modules with Polyhedral Scintillation Crystals
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Solution Overview
Problem
Current PET devices for brain imaging have limitations in sensitivity due to their circular or spherical designs that do not optimally cover the human head, leading to gaps and inefficiencies in gamma ray detection, and are constrained by the manufacturing of continuous scintillation crystals which cannot form elongated curved surfaces like the human head.
Innovation Solution
A PET imaging device with a three-dimensional structure composed of independent gamma ray detection modules with polygonal sections, such as pentagonal and hexagonal shapes, forming a hollow elongated structure that closely adapts to the human head, minimizing gaps and overlapping, and using a mechanical matrix for precise alignment and adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If circular or spherical PET devices are used, then the device structure is simple and manufacturing is easier, but the angular coverage and sensitivity are reduced due to gaps between detectors and the human head shape
Solution Approach 1:
The PET device is divided into multiple independent detection modules arranged in a polyhedral configuration (e.g., icosahedron with triangular, square, rectangular, pentagonal, hexagonal, heptagonal, or octagonal sections). Each module can be manufactured separately and then assembled, combining manufacturing simplicity with improved angular coverage that adapts to the human head shape, thereby maintaining ease of manufacture while enhancing sensitivity.
Solution Approach 2:
The invention transitions from traditional circular/spherical 2D detector arrangements to a 3D polyhedral structure. This dimensional change allows detectors to be positioned in multiple spatial orientations around the head, maximizing angular coverage and sensitivity while maintaining structural simplicity through regular geometric forms that are easier to manufacture than custom-shaped detectors.
2Reliability
If the number of detectors is increased to improve sensitivity and coverage, then the sensitivity and angular coverage improve, but the device complexity and cost increase
Solution Approach 1:
The invention uses polyhedral geometries (icosahedron, dodecahedron, and other regular polyhedra) that approximate spherical coverage. These geometric shapes provide comprehensive angular coverage with fewer detector elements compared to traditional circular arrangements, reducing device complexity while maintaining high sensitivity through optimized spatial distribution of detectors around the head.
3Ease of manufacture
If continuous scintillation crystals are used, then the manufacturing process is simpler and more cost-effective, but the crystals cannot form elongated curved surfaces that closely adapt to the human head shape
Solution Approach 1:
The continuous crystal is segmented into multiple discrete scintillation crystals arranged in polyhedral modules. Each crystal can be manufactured using standard cylindrical ingot growth methods, then cut and assembled into polyhedral configurations. This segmentation allows simple crystal manufacturing while the collective polyhedral arrangement adapts to the human head shape, resolving the contradiction between manufacturing simplicity and shape adaptability.
Solution Approach 2:
The invention transitions from attempting to create continuous curved crystal surfaces to using discrete crystals arranged in 3D polyhedral structures. This dimensional approach allows standard crystal manufacturing techniques to be used while the polyhedral configuration provides head-shape adaptability, combining manufacturing ease with improved geometric fit.
4Reliability
If the detector distance to the patient is decreased to improve sensitivity, then the sensitivity improves, but the device becomes less comfortable for patients and more difficult to position
Solution Approach 1:
The polyhedral detector modules are designed to be adjustable and reconfigurable, allowing the device to adapt to different patient head sizes and shapes. The modular structure enables dynamic positioning of detectors at optimal distances for sensitivity while maintaining patient comfort through customizable fit, resolving the contradiction between close detector placement and patient ease of operation.
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 design enhances sensitivity by maximizing angular coverage and proximity to the brain while minimizing the number of detectors, providing improved image quality and comfort for patients with a customizable fit to different head sizes and shapes.
Implementation Method 1
detection modules comprise continuous scintillation crystals of polygonal main section
Implementation Method 2
The detectors of a PET scanner are arranged in a ring-shaped structure around the patient, and because they detect in coincidence the photons generated in each annihilation
Data Source
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AI summary
The invention relates to a PET imaging device for observing the brain, characterised by comprising a structure with a shape that is capable of accommodating a human head, having independent gamma-ray detection modules, said detection modules having continuous scintillation crystals with a polygonal main section, wherein all together the detection modules form a hollow three-dimensional structure that can surround the head, and with said three-dimensional structure being elongated and having a main axis in the direction corresponding to the forehead-nape direction and a shorter axis in the direction corresponding to the straight line joining the ears, and with the adjacent scintillation crystals fitting together laterally in a precise manner along their entire thickness, forming a mosaic-like structure, i.e. without leaving gaps and without overlapping with one another.