Positron Emission Tomography Scanner Axial Field of View
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current PET scanners face limitations in sensitivity and axial field of view due to cylindrical geometry, which affects the accuracy and efficiency of positron emission tomography imaging, particularly in capturing dynamic processes and covering large organs like the lung or heart, while maintaining cost-effectiveness.
Innovation Solution
The implementation of a PET scanner design where every other detector module is shifted axially, creating a central and two peripheral scanning regions, increasing the axial field of view without altering the overall sensitivity or cost, and utilizing time-of-flight reconstruction to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial length of the detector cylinder is increased to improve sensitivity, then the sensitivity is improved, but the size and cost of the scanner increase
Solution Approach 1:
The detector ring is divided into multiple detector modules that can be independently positioned. By segmenting the detection system into discrete modules, the patent enables flexible axial arrangement to extend the field of view while maintaining the sensitivity benefits of a compact cylindrical geometry.
Solution Approach 2:
The patent introduces axial displacement of detector modules along the cylinder axis, adding a third dimension to the traditional planar detector arrangement. This axial dimensioning allows the system to capture events from a extended field of view without increasing the radial or axial footprint of the scanner hardware.
2Area of stationary object
If the axial length is increased to cover large organs like lung or heart, then the field of view is improved, but the manufacturing cost increases
Solution Approach 1:
By dividing the detector ring into modular segments that can be axially displaced, the system achieves extended field of view coverage for large organs without requiring a proportionally larger overall scanner structure, thereby controlling manufacturing costs.
Solution Approach 2:
The detector modules are designed with adjustable axial positions, allowing dynamic reconfiguration of the detection geometry. This dynamic capability enables the system to optimize field of view for different organ sizes and locations without manufacturing custom hardware for each application.
3Area of stationary object
If detector modules are shifted axially to create central and peripheral scanning regions, then the axial field of view is increased, but the device complexity increases
Solution Approach 1:
The detector ring is segmented into multiple modules that can be independently positioned axially. This segmentation allows systematic creation of central and peripheral scanning regions through controlled module displacement, managing complexity through modular design.
Solution Approach 2:
The patent employs asymmetric axial positioning of detector modules to create distinct central and peripheral scanning regions. By introducing controlled asymmetry in module placement, the system achieves functional differentiation in scanning regions while maintaining overall system coherence.
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
This design enhances the axial field of view and sampling capabilities, improving image reconstruction and dynamic process capture while maintaining equivalent sensitivity and cost compared to traditional configurations, with complete sampling achieved through rotation and axial movement.
Implementation Method 1
a first detector module... is shifted by a predetermined distance in an axial direction from a second detector module... each detector module being configured to detect gamma rays generated from positron annihilation events
Implementation Method 2
if accurate timing (i.e., few hundred picoseconds) is available, time-of-flight calculation can add more information on the likely position of the event along the line
Data Source
AI summary
A gamma ray detection system includes a plurality of detector modules having a same length, where each detector module is configured to detect gamma rays generated from positron annihilation events. A first detector module of the plurality of detector modules is shifted by a predetermined distance in an axial direction from a second detector module of the plurality of detector modules that is adjacent to the first detector module, where the predetermined distance is less than the length of the detector modules.