3D Multispectral MRI Frequency-Overlapped Spectral Windows
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Solution Overview
Problem
Current 3D multispectral MRI protocols face limitations in achieving short sequence repetition times (TR) due to spectral window crosstalk, which hinders the generation of T1 contrast images, especially in the presence of paramagnetic implants like joint replacements, where image clarity and tissue assessment are compromised.
Innovation Solution
The method involves scanning a spectrum of spectral windows with an MRI scanner, where each window has a continuously-differentiable frequency distribution, and adjacent windows are spaced with uniform frequency offsets for substantial overlap, allowing for flexible repetition times and enhanced T1 contrast by scheduling scan intervals to maximize temporal spacing between nearest neighbor windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 3D multispectral MRI protocols use heavy frequency overlap of spectral components, then residual image artifacts are reduced, but sequence repetition time (TR) becomes too long to generate T1 contrast images
Solution Approach 1:
The spectrum is divided into multiple spectral windows that are scanned in separate interleaved passes. This segmentation allows each spectral window to be acquired with optimized timing, enabling shorter TR while maintaining the benefits of frequency overlap through the interleaved acquisition structure.
Solution Approach 2:
The patent employs periodic interleaved acquisition where spectral windows are scanned in a repeating pattern across multiple passes. This periodic action allows systematic management of spectral window crosstalk while maintaining short TR, as the interleaved structure creates predictable temporal spacing between adjacent spectral windows.
2Measurement precision
If spectral windows are closely spaced to achieve frequency overlap, then image artifacts are reduced, but spectral window crosstalk increases and limits TR management
Solution Approach 1:
The spectrum is segmented into discrete spectral windows with controlled spacing. By dividing the frequency spectrum into manageable segments and acquiring them in interleaved passes, the patent reduces spectral window crosstalk while maintaining frequency overlap benefits, simplifying the management complexity.
Solution Approach 2:
The patent dynamically adjusts the temporal spacing of spectral window acquisitions through interleaved passes. This dynamic timing management optimizes the balance between frequency overlap (for artifact reduction) and crosstalk minimization, allowing flexible TR management adapted to specific imaging requirements.
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 generation of 3D multispectral MRI with improved T1 contrast and reduced image artifacts, providing clearer imaging of soft tissues and orthopedic implants by minimizing crosstalk and optimizing scan intervals.
Implementation Method 1
Magnetic resonance imaging (''MRI''). Particular embodiments relate to methods for enhancement of MRI in inhomogeneous magnetic fields
Implementation Method 2
the individual magnetic moments of particle spins in the tissue attempt to align with the polarizing field, but precess about the field in random order at their characteristic Larmor frequency
Implementation Method 3
If the tissue is subjected to an RF magnetic field, i.e., excitation field B1, which defines an x-y plane and varies at a frequency near a Larmor frequency of selected particles, the net aligned moment, or 'longitudinal magnetization' of those selected particles, may be rotated, or 'tipped', into the x-y plane to produce a net transverse magnetic moment
Implementation Method 4
In order to form a pixelated image for human interpretation, gradient magnetic fields, Gx, Gy, Gz, are applied to localize the tissue response to B1
Data Source
AI summary
A method for acquiring 3D multispectral MRI of a target includes scanning a spectrum of spectral windows with an MRI scanner, wherein each spectral window of the spectrum defines a continuously-differentiable distribution of frequencies around a scan frequency and adjacent scan frequencies are spaced apart by substantially uniform frequency offsets such that adjacent spectral windows substantially uniformly overlap, wherein selected adjacent spectral windows are scanned in consecutive passes, and nearest neighbor spectral windows within each pass are scanned at a maximum temporal spacing within the pass.