Adjustable SPECT Detector Arc for Stationary Imaging
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Solution Overview
Problem
Existing SPECT scanners face challenges with large, flat detectors that struggle to image irregularly shaped subjects effectively, leading to lower quality peripheral images and increased imaging time due to the need for rotating components and discomfort for subjects.
Innovation Solution
The development of adjustable SPECT detector systems with a detector arc that can conform to the subject's shape, allowing stationary operation and providing a complete field of view through adjustable detector units and components, ensuring optimal angular coverage and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large flat SPECT detectors are used to image a wide range of subjects, then the field of view is increased, but image quality deteriorates in peripheral areas and device complexity increases due to rotating components
Solution Approach 1:
The detector is divided into multiple independently adjustable detector units arranged in an arc. Each unit can be individually positioned to optimize its field of view and image quality for different regions of the subject, while collectively providing a large overall field of view.
Solution Approach 2:
The detector units are made adjustable and reconfigurable along the detector arc, allowing the system to adapt its geometry to match the subject's size and shape. This dynamic configuration enables each detector unit to maintain optimal imaging conditions without requiring rotation during scanning.
2Area of stationary object
If large flat SPECT detectors are used to cover the entire subject, then the field of view is increased, but device complexity increases due to electro-mechanical rotating components
Solution Approach 1:
The detector system is segmented into multiple adjustable units that can be independently positioned. This eliminates the need for complex rotating mechanisms while achieving comprehensive coverage of the subject through strategic placement of stationary detector units.
Solution Approach 2:
Instead of rotating a single large detector to achieve coverage, the invention inverts the approach by using multiple smaller adjustable detectors positioned in an arc around the subject. This stationary multi-unit configuration achieves the same coverage without rotation.
3Measurement precision
If small SPECT detectors are used to improve image quality, then measurement precision is improved, but the field of view is reduced and imaging time increases
Solution Approach 1:
Multiple small detector units with high measurement precision are merged into a unified arc configuration. This combination maintains the superior image quality of small detectors while achieving a large overall field of view through their collective arrangement around the subject.
Solution Approach 2:
The detector units are arranged in an arc (adding a spatial dimension) rather than being placed in a single plane. This arc configuration allows small detectors to collectively cover a large field of view by distributing them along the curved path around the subject.
4Measurement precision
If small SPECT detectors are used to improve image quality, then measurement precision is improved, but imaging time increases
Solution Approach 1:
The adjustable arc configuration of multiple detector units enables continuous data acquisition from all positions simultaneously. This eliminates the need for time-consuming rotations or repositioning during scanning, maintaining high image quality while reducing total imaging time.
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 solution enables high-quality imaging of large fields of view for various subject sizes without the need for rotating components, reducing patient discomfort and imaging time while maintaining high sensitivity and spatial resolution.
Implementation Method 1
The scintillator converts the gamma radiation into lower energy ultraviolet photons that are detected by the photomultiplier tubes
Implementation Method 2
The scintillator converts the gamma radiation into lower energy ultraviolet photons that are detected by the photomultiplier tubes. These, in turn, generate image data
Data Source
AI summary
A SPECT detector system includes a plurality of detector units. Each detector unit includes a plurality of detector elements disposed in fixed positions with respect to one another. The detector units are adjustably positioned with respect to one another around a detector arc, which is placed adjacent to a patient.