Layered PET-CT Detector for Registration Alignment
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Solution Overview
Problem
Current PET and CT imaging systems face significant registration errors due to misalignment during combined imaging, as PET images have lower resolution and provide no structural information, while CT images offer no functional information, necessitating precise patient positioning.
Innovation Solution
A hybrid imaging system with a single radiation detector layer for CT and a second layer for PET, where the second layer is disposed below the first, allowing for efficient scanning and simplified registration without moving the patient, and reusing CT detector parts for PET imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If separate PET and CT scanners are used for combined imaging, then functional and structural information can be obtained, but significant registration errors occur due to misalignment during patient positioning
Solution Approach 1:
The patent combines PET and CT detection capabilities into a single detector system with multiple layers. The first detector layer detects transmission radiation for CT imaging while the second detector layer detects emission radiation for PET imaging, eliminating the need for separate scanners and patient repositioning, thereby achieving perfect registration between functional and structural images
Solution Approach 2:
The single detector system performs multiple functions: it detects both transmission radiation (for CT) and emission radiation (for PET) simultaneously. The detector layers are configured to handle different radiation types and imaging modes, providing both anatomical and functional information from a single imaging session
2Device complexity
If a single detector layer is used for both CT and PET, then system complexity is reduced, but the detector must handle different radiation types effectively
Solution Approach 1:
The detector system is segmented into multiple layers with specialized functions. The first layer is optimized for CT transmission radiation detection while the second layer is optimized for PET emission radiation detection. This segmentation allows each layer to be tuned for its specific radiation type while maintaining a unified detector structure
Solution Approach 2:
The patent adds a dimensional aspect to the detector design by stacking multiple detector layers in the depth direction. This layered structure enables the single detector to handle different radiation types (transmission and emission) by assigning different layers to different detection tasks, effectively adding a dimension of functional differentiation
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 scanning efficiency, simplifies registration, and reduces costs by eliminating the need for precise patient repositioning and minimizing the need for separate PET-CT systems.
Implementation Method 1
The detectors of the first layer have a first cross-sectional dimension that converts incident radiation from a transmission radiation source into transmission data
Implementation Method 2
detectors...converts incident radiation...into transmission data
Implementation Method 3
The detectors of the second detector layer have a second cross-sectional dimension that is different from the first cross-sectional dimension and are disposed below the first detector layer to convert emission radiation into nuclear data
Data Source
AI summary
A radiation detector (16) having a first detector layer (24) and a second detector layer (26) encircles an examination region (14). Detectors of the first layer include scintillators (72) and light detectors (74), such as avalanche photodiodes. The detectors of the second detector layer (26) include scintillators (62) and optical detectors (64). The scintillators (72) of the first layer have a smaller cross-section than the scintillators (62) of the second layers. A group, e.g., nine, of the first layer scintillators (72) overlay each second group scintillator (62). In a CT mode, detectors of the first layer detect transmission radiation to generate a CT image with a relatively high resolution and the detectors of the second layer detect PET or SPECT radiation to generate nuclear data for reconstruction into a lower resolution emission image. Because the detectors of the first and second layers are aligned, the transmission and emission images are inherently aligned.