Sparse Modular Gamma Camera Design for Resolution Cost Trade-off
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Solution Overview
Problem
Current gamma cameras, particularly those using scintillators, are costly and have limitations in spatial and energy resolution, leading to suboptimal imaging quality and increased costs due to the use of traditional detector technologies.
Innovation Solution
The implementation of a modular gamma camera design with sparse placement of semiconductor detectors like CZT, combined with optimized collimation and motion, to enhance image quality while reducing costs by using fewer detector modules and compensating with advanced collimation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional scintillator-based gamma cameras are used, then cost is reduced, but spatial and energy resolution are limited
Solution Approach 1:
The detector array is segmented into sparse sampling points rather than being fully populated, reducing the total number of expensive semiconductor detectors while maintaining adequate resolution through optimized collimation and reconstruction algorithms
Solution Approach 2:
The system changes the detection parameter density from full coverage to sparse sampling, and compensates by adjusting collimation geometry and reconstruction parameters to achieve comparable image quality at lower cost
2Measurement precision
If semiconductor detectors like CZT are used, then imaging quality is improved, but cost increases
Solution Approach 1:
The fully populated detector array is divided into sparsely distributed semiconductor detector modules, reducing the quantity of expensive CZT detectors while maintaining sufficient imaging quality through advanced collimation and reconstruction techniques
Solution Approach 2:
The patent uses fewer, strategically placed semiconductor detectors instead of many expensive ones, effectively replacing costly full-coverage CZT arrays with a more economical sparse configuration that achieves comparable performance
3Area of stationary object
If more detector modules are used, then imaging coverage is improved, but device complexity and cost increase
Solution Approach 1:
The detector array is segmented into sparse sampling points distributed across the imaging area, reducing the total number of modules while maintaining adequate coverage through optimized geometric arrangement and collimation design
Solution Approach 2:
Instead of using full detector coverage, the system employs partial sampling with strategically positioned detectors that provide sufficient imaging information when combined with advanced reconstruction algorithms, avoiding the complexity of complete coverage
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 results in improved spatial and energy resolution, reduced costs, and enhanced imaging performance, making gamma cameras more efficient and cost-effective while maintaining high image quality.
Implementation Method 1
semiconductor solid-state direct conversion detector based gamma or x-ray cameras, such as those using Cadmium-Zinc-Telluride (CdZnTe or CZT)
Implementation Method 2
a collimator (e.g., parallel or focused hole, slit-slat, rotating slat, multiple pinhole, or coded aperture) is integral to the effective functioning of the gamma camera
Implementation Method 3
The crystal scintillates when a gamma photon strikes it and the scintillation light can escape through the window
Data Source
AI summary
An imaging method and device are described for improving the performance of a gamma camera by optimizing a figure of merit that depends upon cost, efficiency, and spatial resolution. In a modular gamma camera comprising a tiled array of gamma detector modules, the performance figure of merit can be optimized by sparsely placing gamma detector modules within the gamma camera, optimizing collimation, and providing means for detector and/or collimator motion. Sparse gamma cameras can be constructed as flat or curved panels, and elliptical or circular rings.