Rotatable Detector Units for Nuclear Medicine Imaging
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Solution Overview
Problem
In Nuclear Medicine imaging systems with multiple detector heads, the movement of detector heads often results in collisions or obstructed views, leading to reduced image resolution and sensitivity, particularly when imaging smaller or irregularly shaped subjects.
Innovation Solution
The system employs a gantry and patient support structure with rotatable detector units that can move independently and adjust their position to avoid collisions and optimize the field of view, using a detector position controller to calculate and manage movement based on field of view and collision avoidance information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detector heads are positioned close to the subject to improve image resolution, then image resolution is improved, but detector heads may collide with each other
Solution Approach 1:
The system makes the detector heads dynamically movable with independent rotation and translation capabilities. Each detector head can adjust its position and orientation dynamically during the scanning process, allowing them to navigate around each other and maintain close proximity to the subject without collision. This dynamic positioning resolves the contradiction between needing close placement for high resolution and avoiding collisions for reliability.
2Reliability
If detector heads are moved apart to avoid collisions, then collision risk is reduced, but gaps between detectors increase reducing sensitivity
Solution Approach 1:
The detector heads employ dynamic positioning with independent motion control, allowing them to maintain optimal spacing that avoids collisions while minimizing gaps. The system can adjust the position of each detector head in real-time to maintain both safety margins and detection sensitivity, resolving the contradiction between collision avoidance and sensitivity maintenance.
3Measurement precision
If detector heads are positioned to focus on a region of interest, then image quality is improved, but one detector head may obstruct the view of another
Solution Approach 1:
The system segments the detection function across multiple independently controllable detector heads. Each detector head can be independently positioned and oriented to focus on different regions or the same region from different angles. This segmentation allows the system to maintain focused imaging on the region of interest while preventing obstructions, as other detector heads can be positioned to complement rather than block the view.
Solution Approach 2:
The detector heads dynamically adjust their positions and orientations during scanning to optimize field of view for the region of interest while avoiding mutual obstructions. The real-time coordination of multiple detector heads allows them to maintain optimal imaging geometry without blocking each other's views.
4Productivity
If multiple detector heads are used to improve sensitivity, then sensitivity is improved, but device complexity increases
Solution Approach 1:
The system employs multiple detector heads that serve universal functions - each detector head can perform detection, positioning, and orientation adjustments independently. This multi-functionality allows the system to achieve high sensitivity through multiple detectors while managing complexity, as each unit is self-contained and can operate independently or in coordination with others.
Data Source
AI summary
Methods and systems for controlling movement of detectors having multiple detector heads are provided. One system includes a gantry, a patient support structure supporting a patient table thereon, and a plurality of detector units. At least some of the detector units are rotatable to position the detector units at different angles relative to the patient table. The imaging system further includes a detector position controller configured to control the position of the rotatable detector units, wherein at least some of the rotatable detector units positioned adjacent to each other have an angle of rotation to allow movement of the rotatable detector units a distance greater than a gap between adjacent rotatable detector units. The detector position controller is configured to calculate at least one of field of view avoidance information or collision avoidance information to determine an amount of movement for one or more of the rotatable detector units.