Adjustable Detector Array for Nuclear Medicine Imaging
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Solution Overview
Problem
Nuclear medicine imaging systems face challenges in reducing patient discomfort and improving imaging sensitivity due to the fixed configuration of cadmium zinc telluride (CZT) modules and the physical constraints of detector arrays, which limit the field of view and angular resolution.
Innovation Solution
An adjustable detector array with multiple rows of CZT modules is implemented, allowing for orthogonal movement and rotation within an annular gantry, equipped with proximity sensors and exchangeable collimators to optimize positioning and reduce contact with the patient, thereby increasing sensitivity and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detector units are positioned in close proximity to the subject to increase imaging sensitivity, then imaging sensitivity is improved, but patient discomfort (physical pinching and mental claustrophobia) increases
Solution Approach 1:
The detector array is designed with movable detector units that can dynamically adjust their position relative to the patient. The system transitions from a static fixed configuration to a dynamic adjustable configuration, allowing detectors to move closer for high sensitivity imaging when needed while retreating to reduce patient discomfort during other phases
Solution Approach 2:
The system changes the spatial parameter (distance between detector and patient) based on imaging requirements. By adjusting the position parameter of detector units along the patient table, the system optimizes the balance between imaging sensitivity (requiring close proximity) and patient comfort (requiring greater distance)
2Measurement precision
If a single row of CZT modules is used in each detector, then device complexity is reduced, but imaging sensitivity is fundamentally limited
Solution Approach 1:
Each detector unit is segmented into multiple rows of CZT modules rather than using a single row. This segmentation allows the system to capture more gamma rays simultaneously from different angles, fundamentally improving imaging sensitivity while maintaining modular construction that manages complexity
Solution Approach 2:
The detector design transitions from a one-dimensional single row of CZT modules to a multi-dimensional array with multiple rows. This dimensional expansion increases the detection surface area and angular coverage, thereby improving imaging sensitivity without proportionally increasing overall system complexity
3Area of stationary object
If detector heads are moved to different angular positions to acquire NM imaging data, then field of view is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The detector array is designed to perform multiple functions: it can acquire data from fixed angular positions for standard imaging, move detector units to different angular positions for specialized imaging protocols, and adjust proximity for different patient sizes. This multi-functionality increases field of view capabilities while consolidating movement and positioning functions into a unified system
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
The adjustable detector array enhances imaging sensitivity and reduces patient discomfort by allowing precise alignment and movement of detector units, improving angular resolution and flexibility in imaging applications.
Implementation Method 1
a first one of the pair of proximity detectors comprises a first optical sensor configured to project a light-emitting diode (LED) beam
Implementation Method 2
each detector unit having a plurality of rows of detector modules... acquire medical imaging data from the plurality of detector units based on the incoming radiation
Data Source
AI summary
Methods and systems are provided for a medical imaging system having a detector array. In one example, the detector array may include a plurality of adjustable imaging detectors, each of the plurality of adjustable imaging detectors including a detector unit, each detector unit having a plurality of rows of detector modules, wherein the plurality of adjustable imaging detectors may be arranged on an annular gantry, the annular gantry configured for rotation about an axis of a cylindrical aperture of the annular gantry, the axis extending a length of the cylindrical aperture, and wherein each of the plurality of adjustable imaging detectors may be disposed within the cylindrical aperture and may extend orthogonally toward the axis.