Alternating Phase Encoding Directions for Accelerated Multi-Acquisition MRI
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Solution Overview
Problem
Current MRI technologies require long scan times for multi-acquisition imaging due to redundancy in k-space data acquisition, with existing methods failing to effectively explore varying undersampling patterns between images, leading to inefficiencies in data acquisition and reconstruction.
Innovation Solution
A new sampling strategy that alternates phase encoding directions for multiple acquisitions, reducing data redundancy and overlap between images, which can be combined with central or random sampling patterns, and utilizes Convolutional Neural Networks (CNNs) or Compressed Sensing (CS) algorithms for improved reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple acquisitions are performed for different tissue contrasts using conventional MRI sequences, then diagnostic accuracy is improved, but scan time is significantly extended
Solution Approach 1:
The patent combines multiple phase encoding directions (first and second directions) into a single multi-acquisition imaging process. By acquiring k-space data along different phase encoding directions simultaneously or in an interleaved manner, the system obtains multiple tissue contrast images without performing separate sequential scans, thereby reducing total scan time while maintaining diagnostic accuracy through multi-contrast information.
Solution Approach 2:
The patent introduces an additional dimension to the traditional single phase encoding direction by implementing acquisitions along both first and second phase encoding directions. This dimensional expansion allows the system to capture complementary anatomical information and tissue contrasts more efficiently, reducing the time required for multiple sequential acquisitions while improving diagnostic reliability through diverse contrast mechanisms.
2Ease of manufacture
If k-space data is acquired using single phase encoding direction, then data acquisition is simple, but data redundancy exists between multiple acquisitions
Solution Approach 1:
The patent employs asymmetric phase encoding by acquiring k-space data along two different phase encoding directions (first and second directions) rather than repeating acquisitions along the same direction. This asymmetric approach distributes the acquired information more efficiently across different spatial frequencies and contrasts, minimizing redundant data collection while maintaining acquisition simplicity through standardized pulse sequence implementation.
3Productivity
If multiple phase encoding directions are used for multi-acquisition imaging, then scan time is reduced, but image reconstruction complexity increases
Solution Approach 1:
The patent segments the k-space data acquisition process into multiple independent phase encoding direction components (first direction acquisitions and second direction acquisitions). Each segment can be processed and reconstructed separately using standard Fourier transform techniques, then combined to form the final multi-contrast images. This segmentation approach maintains reconstruction simplicity while achieving accelerated scanning through multi-directional data collection.
Data Source
AI summary
Provided is an MRI image generation method including: acquiring first phase encoding lines obtained by undersampling along a first direction using an MRI device; acquiring second phase encoding lines obtained by undersampling in a second direction different from the first direction using the MRI device; generating a first MRI image based on the first phase encoding lines and the second phase encoding lines; and generating a second MRI image different from the first MRI image based on the first phase encoding lines and the second phase encoding lines.