Adaptive SPECT Detector Array for Spiral and Planar Imaging
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Solution Overview
Problem
Current SPECT/CT systems are large, expensive, and impractical for spiral imaging due to the use of large gamma detectors that require significant space and multiple exposures, limiting their applicability in medical settings.
Innovation Solution
An imaging system with movable detectors in a circumferential gantry that allows for radial movement, tilting, and additional degrees of freedom to form various imaging surfaces, including planar and spiral imaging, using wider detector heads that can be arranged to minimize gaps and maximize gamma ray collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional large field of view gamma cameras are used to ensure sufficient particle counts for quality images, then image quality is improved, but the system footprint and size increase significantly
Solution Approach 1:
The large detector array is divided into multiple smaller detector heads (e.g., 6-12 individual detector heads) that can be independently positioned and moved. Each detector head captures a portion of the gamma radiation, and the data from all detectors is combined to form complete images, achieving the same image quality as a single large detector without requiring a large fixed footprint.
Solution Approach 2:
The detector heads are mounted on movable platforms or arms that can dynamically adjust their positions during the imaging process. This allows the detectors to be reconfigured for different imaging modes (planar, tomographic, spiral) and to optimize their spacing and orientation, enabling high-quality imaging with a compact system that can adapt its geometry rather than requiring a fixed large footprint.
2Adaptability or versatility
If multiple detectors are added to enable spiral imaging, then imaging versatility is improved, but system complexity and cost increase
Solution Approach 1:
The system is designed with detector heads that can perform multiple imaging functions (planar imaging, tomographic imaging, and spiral imaging) using the same hardware platform. The detector heads can be reconfigured through software control and mechanical adjustment to execute different imaging protocols, eliminating the need for separate dedicated systems for each imaging mode and reducing overall system complexity.
Solution Approach 2:
The movable detector platforms enable dynamic reconfiguration of the imaging geometry. The same physical detectors can be positioned in different spatial arrangements and motion patterns to perform various imaging tasks, with the system adapting its configuration based on the required imaging mode rather than requiring fixed, dedicated hardware for each function.
3Measurement precision
If detector axial length is increased to improve particle count collection, then image quality is improved, but the number of detectors required for spiral imaging becomes impractically large
Solution Approach 1:
Instead of using a small number of very long detectors, the system uses multiple shorter detector heads (e.g., 6-12 detectors) that are distributed around the patient. The collective detection area of all detectors combined provides sufficient particle count collection, while the segmented arrangement allows for more practical detector dimensions and reduces the total number of detectors needed compared to traditional approaches.
Solution Approach 2:
The system transitions from a single-dimension approach (long axial detectors) to a multi-dimensional arrangement where multiple detectors are distributed in three-dimensional space around the patient. This spatial distribution allows the system to collect sufficient gamma radiation through the combined effective area of multiple detectors positioned at different locations, eliminating the need for impractically long individual detectors.
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
Enables efficient and flexible imaging with a single machine, supporting 2D planar, 3D tomographic, and 4D spiral imaging without the need for extensive space, reducing the number of detectors required and improving image quality.
Implementation Method 1
a plurality of detector heads having an imaging face configured to receive and detect gamma radiation from the patient
Data Source
AI summary
An imaging system for gamma ray imaging includes a gantry with an opening configured to receive a patient to be imaged and a plurality of imaging arms. The arms each include a detector head having an imaging face that receives and detects gamma radiation from the patient and an arm coupled to the gantry with a plurality of actuators configured to move the detector head radially within the gantry, tilt the imaging face relative to an axis of the arm, and to adjust spacing between detector heads on adjacent imaging arms. A processor is configured to coordinate movement of the imaging arms such that together the imaging faces of the plurality of imaging arms selectively form one of a plurality of predetermined imaging surfaces within the gantry. One of the predetermined imaging surfaces is a flat plane with uniform spacing of the plurality of detector heads suitable for planar imaging. Other surfaces are suitable for tomographic imaging.