STAGE MRI Resolution via Multi-Flip Angle K-Space Merging
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Solution Overview
Problem
Current MRI technologies face challenges in achieving high resolution for susceptibility-weighted imaging (SWI) and quantitative susceptibility mapping (QSM) due to low resolution from existing rapid STAGE protocols, which do not adequately reveal small veins or meet clinical study needs.
Innovation Solution
The method involves acquiring and combining k-space datasets from multiple flip angles, specifically using dual-echo or multi-echo GRE sequences at different flip angles to generate high-resolution MR images with little to no increase in data acquisition time, employing techniques such as k-space merging and phase adjustments to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If rapid STAGE protocols are used for MRI imaging, then scan time is reduced, but image resolution deteriorates
Solution Approach 1:
The patent segments the k-space data acquisition into multiple separate acquisitions at different flip angles (e.g., 6 degrees and 24 degrees). Each flip angle acquisition captures different portions of k-space, which are then combined to form a complete high-resolution image. This segmentation allows the system to maintain rapid scanning while achieving high resolution through strategic combination of multiple lower-resolution acquisitions.
Solution Approach 2:
The patent merges k-space datasets acquired at different flip angles to create a composite high-resolution image. Specifically, the central portion of k-space from one flip angle is combined with outer portions from another flip angle, leveraging the complementary strengths of each acquisition to produce an image with both high resolution and rapid scan time.
2Manufacturing precision
If multiple flip angles are used in STAGE imaging, then image contrast and resolution are improved, but data acquisition complexity increases
Solution Approach 1:
The patent employs periodic alternation between different flip angles during the imaging sequence. The system systematically switches between flip angles (e.g., 6 degrees, 24 degrees) in a predetermined pattern, acquiring k-space data at each angle. This periodic action simplifies the complexity by providing a structured, repeatable acquisition protocol that can be easily implemented and controlled.
3Manufacturing precision
If high resolution SWI and QSM images are achieved through conventional methods, then image quality is improved, but scan time is prolonged
Solution Approach 1:
The patent applies partial action by acquiring only the necessary portions of k-space at each flip angle rather than complete datasets. Specifically, it acquires the central portion of k-space at one flip angle and outer portions at another, which is sufficient to reconstruct high-resolution images without requiring full k-space sampling at multiple angles. This partial acquisition strategy reduces scan time while maintaining image quality.
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 results in high-resolution SWI and QSM images while maintaining rapid scan times, effectively addressing the limitations of existing protocols by improving in-plane resolution and signal-to-noise ratio without prolonging data acquisition.
Implementation Method 1
When a body is placed in the generated static magnetic field, the hydrogen protons within the body align to the magnetic field
Implementation Method 2
An RF pulse is applied in the form of an oscillating B1 field to tip the spins so that there is a bulk magnetization remaining in the transverse field
Implementation Method 3
The RF receiver coils detect the precessing magnetization and from it create a measurable current
Implementation Method 4
strategically acquired gradient echo (STAGE) imaging
Data Source
AI summary
Systems and methods for high-resolution STAGE imaging can include acquisition of relatively low-resolution k-space datasets with two separate multi-echo GRE sequences. The multi-echo GRE sequences can correspond to separate and distinct flip angles. Various techniques for combining the low-resolution k-space datasets to generate a relatively high-resolution k-space are described. These techniques can involve combining low-resolution k-space datasets associated with various echo types. The STAGE imaging approaches described herein allow for rapid imaging, enhanced image resolution with relatively small or no increase in MR data acquisition time.