Multi-Echo MRI Sequence for Simultaneous Anatomical and Temperature Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current magnetic resonance imaging (MRI) techniques face a trade-off between achieving high spatial resolution for anatomical images and high time resolution for temperature monitoring during heating operations, as existing temperature imaging sequences often compromise on either spatial or temporal resolution.
Innovation Solution
A method employing a multi-echo imaging sequence, where one echo is used for anatomical imaging with a larger number of phase encoding steps to achieve high spatial resolution and another echo for temperature imaging with fewer phase encoding steps to achieve high time resolution, allowing for independent imaging of both types of images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the parameters of the temperature imaging sequence are optimized with short repeat time to achieve high time resolution, then the time resolution is improved, but the spatial resolution and tissue contrast are worsened
Solution Approach 1:
The patent divides the imaging task into two separate sequences: a temperature imaging sequence with short TR for high time resolution, and an anatomical imaging sequence with longer TR for high spatial resolution. This segmentation allows each sequence to be optimized independently for its specific purpose, resolving the contradiction between time and spatial resolution requirements.
Solution Approach 2:
The patent employs a multi-echo sequence that serves dual functions: the first echo provides temperature imaging information while the second echo provides anatomical imaging information. This multi-functionality allows a single sequence to address both time resolution and spatial resolution requirements without requiring separate imaging protocols.
2Productivity
If fewer steps of phase encoding are applied to optimize imaging time for temperature monitoring, then the imaging time is reduced, but the anatomical image resolution and tissue differentiation are worsened
Solution Approach 1:
The patent segments the phase encoding steps between two different imaging objectives: the temperature imaging sequence uses fewer phase encoding steps for speed, while the anatomical imaging sequence uses more phase encoding steps for resolution. This segmentation allows each imaging type to have its phase encoding steps optimized independently.
Solution Approach 2:
The patent introduces a temporal dimension by using multiple echoes within a single repetition time. The first echo is used for temperature imaging with reduced phase encoding, while the second echo is used for anatomical imaging with increased phase encoding. This dimensional approach allows both imaging types to coexist in the same TR without compromising either performance.
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 enables the simultaneous acquisition of anatomical images with high spatial resolution and temperature images with high time resolution, optimizing imaging time and contrast between tissues.
Implementation Method 1
perform a temperature imaging utilizing the fact that the proton resonance frequency (PRF) in water skews as the temperature changes so as to obtain a temperature image
Implementation Method 2
a magnetic resonance imaging device employs a multi-echo imaging sequence
Implementation Method 3
Generally, a gradient echo sequence is utilized to perform a PRF skew-based magnetic resonance temperature imaging
Data Source
AI summary
A method for magnetic resonance imaging, in which a magnetic resonance imaging device employs a multi-echo imaging sequence, includes the steps of: applying, to one of the multiple echoes, a first number of steps of phase encoding, applying a readout gradient, and collecting the data of this echo to reconstruct an anatomical image; and applying, to another one of the multiple echoes, a second number of steps of phase encoding, applying a readout gradient, and collecting the data of this echo to construct a temperature image. The method is capable of obtaining at the same time both a temperature image with high time resolution and an anatomical image with high spatial resolution.