MRI Slice Grouping for Channel Efficiency
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Solution Overview
Problem
Magnetic resonance imaging (MRI) systems with high magnetic fields face challenges in spatial inhomogeneity, leading to reduced imaging efficiency and quality, particularly due to uneven emission field distribution, which existing methods struggle to address effectively.
Innovation Solution
A method and system for controlling MRI by determining radiofrequency (RF) parameters for each slice, including channel parameters like excitation power and specific absorption ratio (SAR), to form slice groups that can be excited concurrently, optimizing channel usage and reducing the number of excitations needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple channels are used to excite multiple slices one by one to improve spatial inhomogeneity, then imaging quality is improved, but imaging efficiency decreases
Solution Approach 1:
The patent combines multiple slice excitations into a single simultaneous excitation event by grouping slices and applying RF pulses to multiple channels at the same time. This merging approach maintains the spatial inhomogeneity correction benefits of multi-channel excitation while eliminating the sequential processing bottleneck, thereby improving imaging efficiency without sacrificing imaging quality.
Solution Approach 2:
The patent dynamically assigns slices to different channel groups based on spatial inhomogeneity characteristics and excitation requirements. By adaptively configuring which channels excite which slices in each group, the system optimizes both the correction of spatial inhomogeneity and the efficiency of image acquisition, resolving the contradiction between quality and efficiency.
2Measurement precision
If sequential slice excitation is used to maintain channel parameter control, then parameter precision is maintained, but scan time increases
Solution Approach 1:
The patent segments the set of slices to be imaged into multiple groups, where each group can be excited simultaneously by assigned channels. This segmentation allows the system to maintain precise control of channel parameters for each group while reducing the total number of sequential excitation events, thereby decreasing scan time without compromising parameter control precision.
Solution Approach 2:
The patent enables continuous useful action by allowing multiple channels to excite multiple slice groups simultaneously rather than sequentially. This parallel processing approach maintains the precision of channel parameter control through dedicated channel-group assignments while eliminating idle time between excitations, thus reducing overall 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 enhances imaging efficiency and quality by allowing multiple slices to be excited simultaneously, reducing the time required for scans and improving the uniformity of image data acquisition.
Implementation Method 1
determining a plurality of radiofrequency (RF) parameters, the plurality of RF parameters including at least one channel parameter corresponding to each of a plurality of channels
Implementation Method 2
magnetic resonance imaging (MRI) is provided. The method may be implemented on a machine having at least one processing device and at least one storage device
Data Source
AI summary
Systems and methods for MRI are provided. The methods may include for each slice of a plurality of slices of a subject to be scanned, determining a plurality of radiofrequency (RF) parameters, the plurality of RF parameters including at least one channel parameter corresponding to each of a plurality of channels; determining a slice group based at least in part on the RF parameters corresponding to the plurality of slices, the slice group including at least two slices selected from the plurality of slices; and directing at least a portion of the plurality of channels to excite the slice group based on RF parameters corresponding to the slice group.