MRI Slice Profile Fourier Reconstruction for 3D Spatial Resolution
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Solution Overview
Problem
Current MRI technologies face challenges in generating high-quality T2-weighted images with good spatial resolution in all three dimensions, particularly along the slice-select direction, due to the lengthy acquisition times required for direct three-dimensional T2-weighted spin echo acquisitions.
Innovation Solution
A method is developed to generate a three-dimensional image from multiple two-dimensional images acquired with a medical imaging system by Fourier transforming the multislice data set along the slice orientation direction, converting it into Fourier representation data based on a slice profile, and then inverse Fourier transforming it to achieve finer spatial resolution along the slice orientation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If direct three-dimensional T2-weighted spin echo acquisition is used, then spatial resolution in all three dimensions is improved, but acquisition time becomes prohibitively long
Solution Approach 1:
The patent segments the three-dimensional imaging problem into multiple two-dimensional slice acquisitions. Instead of acquiring all three dimensions simultaneously with long scan times, the system divides the volume into multiple slices acquired sequentially in the slice-select direction, then reconstructs the three-dimensional image computationally. This segmentation allows each 2D slice to be acquired with optimized parameters while the overall 3D resolution is achieved through combination of multiple slices with different phase-encoding steps.
Solution Approach 2:
The patent introduces a computational dimension by performing Fourier transformation along the slice-select direction after acquiring data in k-space. This transforms the data from a set of 2D images into a 3D image with enhanced resolution in the slice direction, effectively adding a processing dimension that recovers fine spatial details without requiring proportionally longer acquisition times.
2Loss of time
If multiple two-dimensional acquisitions are performed instead of direct three-dimensional acquisition, then acquisition time is reduced, but spatial resolution along the slice-select direction deteriorates
Solution Approach 1:
The patent changes the processing parameters by applying Fourier transformation along the slice-select direction rather than simple reconstruction methods. This parameter change in the reconstruction algorithm allows the system to achieve fine spatial resolution in the slice direction from multiple 2D acquisitions, converting the limitation of coarse slice sampling into an opportunity for computational resolution enhancement through proper k-space processing.
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 allows for the creation of three-dimensional images with spatial resolution along the slice orientation direction that is finer than the slice thickness, improving image quality and reducing acquisition time by processing multiple two-dimensional images effectively.
Implementation Method 1
An intermediate data set is generated by Fourier transforming the multislice data set along the slice orientation direction into k-space
Implementation Method 2
A three-dimensional image is then generated by inverse Fourier transforming the Fourier representation data along at least the slice orientation direction
Data Source
AI summary
Systems and methods for generating a three-dimensional image of an object from multiple two-dimensional images acquired using a magnetic resonance imaging (“MRI”) system are provided. The three-dimensional image has high spatial resolution in all three spatial dimensions. The multiple two-dimensional images can be acquired in one or more orientations (e.g., axial, coronal, sagittal, oblique). The in-plane resolution of these images can be several times finer than the through-plane resolution (i.e., the slice thickness). The images are Fourier transformed along their respective slice orientation direction and processed using the slice profile to generate a Fourier representation of the three-dimensional image with the target spatial resolution. Inverse Fourier transforming this Fourier representation generates the desired three-dimensional image.