SPECT Detector Units with Segmented Motion for Resolution
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Solution Overview
Problem
Conventional SPECT camera systems with multiple swinging detector heads face a degradation in imaging resolution due to the increased distance of the detectors from the patient, resulting from their configuration and movement limitations.
Innovation Solution
The proposed imaging system includes a gantry with individually movable detector units capable of translational and rotational movement, and collimators with bores of different lengths to form a non-planar face, allowing for improved positioning and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SPECT camera systems use multiple swinging detector heads with fixed pivot configuration, then the system structure is simplified and ease of manufacture is improved, but the imaging resolution deteriorates due to increased distance from the patient
Solution Approach 1:
The detector head is divided into multiple independently movable detector units, each capable of individual positioning and motion control. This segmentation allows each unit to be optimized for resolution while maintaining overall system functionality.
Solution Approach 2:
The detector units are made dynamically movable with independent control, transitioning from a fixed rigid structure to a flexible dynamic system. This enables real-time adjustment of detector positions to optimize imaging resolution while accommodating complex acquisition motions.
2Measurement precision
If detector units are positioned closer to the subject, then imaging resolution is enhanced, but the device complexity increases due to requirements for precise positioning and motion control
Solution Approach 1:
The controller is designed as a universal multi-functional system that simultaneously manages translational movement, rotational movement, and coordinated positioning of multiple detector units. This consolidates complex control functions into a single integrated system rather than requiring separate control mechanisms for each motion type.
Solution Approach 2:
The system dynamically adjusts positioning parameters (translational and rotational positions) of detector units during operation, enabling flexible optimization of detector-to-subject distance and angular positioning to achieve enhanced resolution without permanent structural modifications.
3Measurement precision
If collimator bores have different lengths to form a non-planar face, then resolution is improved by reducing distance to subject, but manufacturing precision requirements increase
Solution Approach 1:
The collimator is designed with non-uniform local properties, where different bores have different lengths tailored to their specific positioning requirements. This local quality variation allows each collimator-bore-detector unit combination to be optimized for its specific imaging geometry, improving overall resolution while managing manufacturing complexity through localized rather than global uniformity requirements.
Data Source
AI summary
Systems and methods for controlling motion of detectors having moving detector heads are provided. One system includes a gantry and a plurality of detector units mounted to the gantry, wherein the plurality of detector units are individually movable including translational movement and rotational movement. The system further includes a controller configured to control movement of the plurality of detector units to acquire Single Photon Emission Computed Tomography (SPECT) data, wherein the movement includes both the translational movement and the rotational movement coordinated to position the plurality of detector units adjacent to a subject.