Multi-Echo MRI Reconstruction for Vessel-Bleeding Spatial Relationship
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Solution Overview
Problem
Current MRI technologies face challenges in accurately determining the spatial relationship between vessels and bleedings, which is crucial for diagnosing and treating vascular diseases like Moyamoya and ischemic stroke, due to limitations in providing high-resolution 3D images with sufficient contrast for both vessels and bleedings.
Innovation Solution
A method using a multi-echo imaging sequence with flow refocused or dephasing gradients to generate echo signals, which are then processed to create magnitude and phase images, allowing for the reconstruction of images that clearly depict vessel regions and the distribution of susceptibility in bleeding regions, thereby determining their spatial relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-echo imaging sequences are used, then the imaging process is simple and fast, but the ability to distinguish between vessels and bleedings is insufficient
Solution Approach 1:
The patent divides the imaging process into multiple echo signals acquired at different echo times, where each echo signal provides different contrast characteristics. By segmenting the imaging data into multiple echoes, the system can separately optimize for vessel visualization and bleeding detection, resolving the contradiction between simple imaging and high contrast differentiation.
Solution Approach 2:
The patent transitions from single-echo to multi-echo imaging, adding the time dimension (echo time) to the imaging process. This dimensional expansion allows the system to capture multiple contrast states simultaneously, enabling better differentiation between vessels and bleedings without complicating the basic imaging framework.
2Measurement precision
If high-resolution 3D images are generated to show spatial relationship between vessels and bleedings, then diagnostic accuracy improves, but image reconstruction complexity increases
Solution Approach 1:
The patent segments the imaging data into multiple echo signals and processes them through separate magnitude and phase image generation steps. This segmentation allows complex spatial relationship analysis to be broken down into manageable processing stages, improving accuracy while controlling reconstruction complexity through systematic data organization.
Solution Approach 2:
The patent introduces intermediate processing steps including magnitude image generation, phase image generation, and susceptibility distribution calculation. These intermediary processing layers simplify the overall reconstruction complexity by breaking down the complex task of spatial relationship determination into sequential, manageable operations that build upon each other.
3Measurement precision
If multi-echo imaging sequence is used to improve contrast for vessels and bleedings, then imaging quality improves, but scanning time increases
Solution Approach 1:
The patent acquires multiple echo signals continuously during a single imaging sequence without interrupting the scanning process. By maintaining continuous acquisition and utilizing the echo train efficiently, the system improves contrast differentiation while minimizing additional scanning time compared to sequential single-echo acquisitions.
Solution Approach 2:
The patent adds the echo time dimension to the imaging process, acquiring multiple signals at different times within a single TR cycle. This dimensional approach allows parallel extraction of multiple contrast types from a single scanning event, improving imaging quality without proportionally increasing total scan time.
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 approach significantly improves the accuracy of spatial relationship determination between vessels and bleedings, enabling more effective diagnosis and treatment by providing high-resolution, contrast-rich images.
Implementation Method 1
a method for magnetic resonance imaging (MRI) is provided
Implementation Method 2
generating a second image with respect to a distribution of susceptibility of the bleeding region based on the one or more phase images
Data Source
AI summary
The present disclosure relates to a system and method for MRI with respect to vessels and bleedings. The method may include exciting a region of interest by applying an RF pulse, wherein the region of interest includes a vessel region and a bleeding region. The method may further include acquiring a plurality of echo signals related to the region of interest. The method may further include generating one or more magnitude images based on the plurality of echo signals, generating a first image with respect to the vessel region based on the one or more magnitude images, generating one or more phase images based on the plurality of echo signals, and generating a second image with respect to a distribution of susceptibility of the bleeding region based on the one or more phase images.