MRF Pulse Sequence Integrating Free-Waveform B-Tensor Diffusion Encoding
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Solution Overview
Problem
Conventional magnetic resonance imaging (MRI) techniques face challenges in efficiently acquiring both relaxation and diffusion data simultaneously, leading to long acquisition times and mixed effects of isotropic diffusivity, dispersion, and microscopic anisotropy, which complicates the disentanglement of tissue compartmental properties.
Innovation Solution
The integration of free-waveform b-tensor diffusion encoding into a magnetic resonance fingerprinting (MRF) pulse sequence allows for multi-dimensional relaxation-diffusion encoding, enabling simultaneous acquisition and processing of relaxation and diffusivity parameters, such as T1, T2, and apparent diffusion coefficient (ADC), using linear and spherical tensor encoding geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional MRI pulse sequences are used to acquire relaxation and diffusion data separately, then data quality can be maintained, but acquisition time becomes excessively long
Solution Approach 1:
The patent combines relaxation encoding and diffusion encoding into a single integrated pulse sequence. The preparation module simultaneously applies both relaxation preparation (with multiple T1 and T2 weightings) and diffusion preparation (with multiple b-values and diffusion directions) before a single signal acquisition, thereby acquiring multiple parameters in one scan instead of requiring separate sequential scans
Solution Approach 2:
The pulse sequence is designed to perform multiple functions within a single acquisition: it simultaneously provides T1-weighting, T2-weighting, diffusion encoding with multiple b-values, and diffusion encoding with multiple directions. This multi-functional design allows one scan to replace what would traditionally require multiple separate scans, dramatically improving productivity
2Measurement precision
If conventional diffusion encoding is used, then acquisition is simpler, but tissue compartmental properties cannot be properly disentangled due to mixed effects
Solution Approach 1:
The patent segments the diffusion encoding into distinct components: isotropic diffusion encoding (providing ADC values) and anisotropic diffusion encoding (providing directional diffusion information). By separating these effects and acquiring them independently with different encoding schemes, the method enables proper disentanglement of compartmental properties that would otherwise be mixed together in conventional single-direction encoding
Solution Approach 2:
The patent adds multiple dimensions to diffusion encoding by incorporating both isotropic and anisotropic encoding schemes, as well as multiple diffusion directions and b-values. This multi-dimensional encoding approach provides sufficient information to separately characterize different tissue compartments and their properties, achieving precise measurement without oversimplification
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 significantly reduces acquisition time while accurately quantifying relaxation and diffusion parameters, improving the characterization of tissue microstructure and anisotropy, enabling more effective imaging and clinical studies, such as tumor investigation and brain imaging.
Implementation Method 1
a magnetic resonance imaging (MRI) system performs a pulse sequence that integrates free-waveform b-tensor diffusion encoding into a magnetic resonance fingerprinting (MRF) pulse sequence
Implementation Method 2
integrates free-waveform b-tensor diffusion encoding into a magnetic resonance fingerprinting (MRF) pulse sequence to perform a multi-dimensional, relaxation-diffusion encoding
Data Source
AI summary
A method for multi-dimensional, relaxation-diffusion magnetic resonance fingerprinting (MRF) includes performing, using a magnetic resonance imaging (MRI) system, a pulse sequence that integrates free-waveform b-tensor diffusion encoding into a magnet resonance fingerprinting pulse sequence to perform a multi-dimensional, relaxation-diffusion encoding while acquiring MRF signal evolutions, processing, using a processor, the acquired MRF signal evolutions to determine at least one relaxation parameter and at least one diffusivity parameter, and generating, using the processor, a report including at least one of the at least one relaxation parameter and the at least diffusivity parameter.