Movable Gamma-Ray Detector Rings for Adaptive PET Imaging
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Solution Overview
Problem
Current PET scanners face challenges in achieving an adaptive axial field of view (aFOV) without increasing the number of detector modules and rings, which would raise costs. This limits the scanner's ability to accommodate varying patient sizes and clinical demands, leading to decreased signal-to-noise ratio and loss of incident events due to larger gaps between detector rings.
Innovation Solution
The development of an axially-adjustable PET scanner with movable gamma-ray detector rings allows for variable spacing based on patient-specific parameters, such as age, gender, and medical imaging data. This adaptive approach enables the scanner to adjust its axial field of view according to the patient's size and shape, optimizing imaging quality while minimizing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the axial field of view is increased by adding more detector rings, then the imaging coverage is improved, but the system cost increases
Solution Approach 1:
The patent implements movable detector rings that can dynamically adjust their axial positions along the bore. This allows the system to change the axial field of view configuration without permanently adding more detector rings, resolving the contradiction between imaging coverage and system cost by providing adaptability rather than permanent expansion
Solution Approach 2:
The system changes the axial positioning parameter of existing detector rings to optimize the field of view for different imaging scenarios. By adjusting the axial positions of movable rings, the effective imaging coverage is modified without changing the physical number of detectors, thus maintaining cost-effectiveness while improving coverage
2Area of stationary object
If the axial field of view is increased by adding more detector rings, then the imaging coverage is improved, but the system cost increases
Solution Approach 1:
The patent employs dynamically positionable detector rings that can move axially along the bore to optimize coverage. This dynamic repositioning allows the same number of detector modules to provide variable axial field of view, eliminating the need to increase the quantity of detector modules while still improving imaging coverage
Solution Approach 2:
Each movable detector ring serves multiple functions by being repositionable to different axial locations. The same detector ring can participate in different imaging configurations for various patient sizes and clinical applications, making the detector system more universal and reducing the total number of modules needed
3Device complexity
If larger gaps are introduced between detector rings to increase axial field of view, then the cost is reduced, but the signal-to-noise ratio decreases
Solution Approach 1:
The movable detector rings can dynamically adjust their positions to minimize gaps between rings when high signal-to-noise ratio imaging is required. This dynamic adjustment allows the system to optimize the balance between axial field of view and gap size based on clinical needs, preventing permanent large gaps that would degrade image quality
Solution Approach 2:
The axial position parameter of detector rings is changed to optimize both the axial field of view and the gap sizes. By adjusting ring positions, the system can achieve adequate coverage while maintaining smaller gaps where needed to preserve signal-to-noise ratio, resolving the contradiction between configuration simplicity and imaging quality
4Device complexity
If fixed axial field of view is used, then the system design is simplified, but the adaptability to different patient sizes is reduced
Solution Approach 1:
The patent implements dynamically adjustable detector ring positions that can be reconfigured for different patient sizes and imaging applications. This dynamic capability provides adaptability without requiring completely different system designs, as the same movable rings can be positioned to accommodate pediatric, adult, or obese patients
Solution Approach 2:
The axial position parameters of detector rings are changed to optimize imaging for different patient anatomies. By adjusting these parameters, the system adapts to varying patient sizes and clinical demands while maintaining a relatively simple underlying detector architecture, thus balancing complexity and versatility
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 adaptive axial field of view PET scanner improves imaging sensitivity and quality by allowing for optimal detector ring positioning, reducing image noise, and enhancing the capture of information from all regions of the patient, thereby broadening the utility of PET in medical research and clinical applications.
Implementation Method 1
the positron emitter attached to the pharmaceutical agent will emit positrons according to the physical properties of the isotope
Implementation Method 2
Emitted positrons collide with an electron of the imaging object, or patient, resulting in an annihilation of the positron and electron and generation of two gamma rays at 511 keV in opposite directions
Implementation Method 3
PET detectors rings for detecting the generated gamma rays
Data Source
AI summary
A PET scanner includes gamma-ray detector rings that form a bore through which an imaging subject is translated, a length of the bore defining an axial length of the PET scanner, the gamma-ray detector rings being movable along the axial length, the gamma-ray detector rings including gamma-ray detector modules therein, and processing circuitry configured to receive PET data associated with a plurality of transaxial slices of the imaging subject, the PET data including a first set of spatial information and timing information corresponding to a first data acquisition period for the gamma-ray detector modules in a first axial position and a second set of spatial information and timing information corresponding to a second data acquisition period for the gamma-ray detector modules in a second axial position, and reconstruct a PET image based on the first set of spatial and timing information and the second set of spatial and timing information.