MRI Fiducials for PET Readout Alignment in Removable Inserts
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Solution Overview
Problem
Existing PET imaging systems with removable PET components face challenges in accurately determining the exact locations of scintillator blocks and readout boards due to potential misalignment during insertion and removal, necessitating costly manufacturing tolerances and manual calibration.
Innovation Solution
Incorporating MRI-detectable fiducials on PET readout elements within an MRI-compatible PET ring, allowing for automated and flexible calibration and co-registration of PET and MRI scans using MRI coils to determine the precise location of these elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PET components are made removable for flexibility, then ease of operation is improved, but manufacturing precision deteriorates due to alignment variations during insertion and removal
Solution Approach 1:
The patent introduces MRI-detectable fiducials as intermediary reference markers attached to both the PET insert and the MRI scanner housing. These fiducials serve as a common reference framework that mediates the alignment between removable PET components and the MRI system, allowing flexible insertion/removal while maintaining precise positional relationship through MRI-based detection and correction
Solution Approach 2:
The patent replaces mechanical alignment mechanisms with MRI-based optical/magnetic field detection. Instead of relying on mechanical tolerances and physical alignment features, the system uses MRI-detectable fiducials to optically/magnetically determine the position of PET components, substituting mechanical precision requirements with field-based detection and computational correction
2Measurement precision
If strict manufacturing tolerances are enforced, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a virtual copy or model of the PET insert geometry using MRI-detectable fiducials. By detecting the positions of these fiducials in the MRI scanner coordinate system, the system reconstructs the spatial relationships of PET components through computational modeling rather than requiring direct mechanical precision, thereby reducing manufacturing complexity while maintaining measurement accuracy
Solution Approach 2:
The patent changes the measurement parameters from direct mechanical position measurements to MRI-detectable signal parameters. By using fiducials that respond to MRI magnetic fields, the system transforms physical alignment problems into detectable signal variations that can be measured and corrected through software, reducing the need for strict manufacturing tolerances
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
Enables accurate and automated alignment of PET and MRI images, reducing manufacturing costs and improving image registration accuracy by leveraging MRI-detectable fiducials for precise positioning of PET components.
Implementation Method 1
an MRI coil inside the PET Ring; said MRI coil detecting and locating the at least one MRI-detectable fiducial on the at least one PET readout element
Data Source
AI summary
Described herein is a method to measure the position of the PET System using the MRI, through the use of MRI coils and fiducials. This approach offers a route to automated calibration which is more flexible than other approaches. This method of position measurement is useful for example in systems which have moving or removeable PET readout board systems or moving or removeable PET scintillator blocks.