PET-MRI Strain Correction via Image Registration
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Solution Overview
Problem
PET-MRI devices face image deterioration due to non-uniformity of the magnetostatic field, leading to strain on MR images, which is not present in PET images, necessitating a method to correct this strain for accurate imaging.
Innovation Solution
A PET-MRI device with image generators and a derivation unit that captures images of a target in both PET and MRI effective visual fields, calculates a strain correction factor based on the positional relation between PET and MR images, and uses this factor to correct the MR image strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MRI imaging is performed using a magnetostatic field, then detailed anatomical structural information can be obtained, but strain is generated on the MR image due to non-uniformity of the magnetostatic field
Solution Approach 1:
The patent introduces a strain correction factor as an intermediary element that mediates between the strained MR image and the corrected image. This correction factor, derived from the positional relationship between PET and MR images, acts as a mediator to eliminate the strain caused by magnetostatic field non-uniformity, thereby resolving the contradiction between obtaining detailed anatomical information and avoiding image distortion
Solution Approach 2:
The patent implements a feedback mechanism where the strain correction factor is calculated based on the positional relationship between PET and MR images, and then this factor is applied to correct the MR image. This closed-loop feedback process continuously adjusts the MR image to compensate for strain, maintaining image quality while preserving the detailed anatomical information provided by MRI
2Loss of information
If PET and MR images are combined for comprehensive imaging, then both functional and anatomical information are obtained, but the strain correction process increases device complexity
Solution Approach 1:
The patent makes the PET image serve multiple functions: it is used both for its primary purpose of obtaining functional information and as a reference for calculating the strain correction factor for the MR image. This multi-functionality approach allows the system to maintain comprehensive imaging capabilities while avoiding the need for separate correction mechanisms, thereby reducing overall system complexity
Solution Approach 2:
The patent merges the strain correction functionality into the existing PET-MRI image registration process. By combining the correction factor calculation with the image fusion workflow, the system achieves strain correction without adding separate complex subsystems, thus maintaining comprehensive imaging information while minimizing device complexity
Data Source
AI summary
A PET-MRI device according to an embodiment includes image generators and a derivation unit. The image generators capture an image of a target placed in an effective visual field of a PET by the PET and an MRI so as to generate a PET image and an MR image. The derivation unit calculates a strain correction factor for correcting strain on the MR image based on a positional relation between a target that is expressed on the PET image and a target that is expressed on the MR image.