Multi-Contrast MRI Pulse Sequence Acceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional MRI systems face challenges in acquiring multiple different image contrasts in a clinically feasible amount of time, leading to reduced image signal-to-noise ratio and increased acquisition time.
Innovation Solution
The MRI system employs a pulse sequence that includes magnetization preparation and multi-echo acquisitions at various echo and inversion times, skipping phase-encoding or partition-encoding steps to accelerate data acquisition, allowing for the collection of multiple contrasts in the same time as a single contrast acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple contrasts are acquired in the same fixed amount of time, then the quantity of image contrasts increases, but the image signal-to-noise ratio per contrast decreases
Solution Approach 1:
The patent combines multiple contrast acquisitions (T1, T2*, and proton density) into a single integrated pulse sequence. By merging these acquisitions and using parallel imaging techniques with multiple receive coils, the system captures multiple contrasts simultaneously without sacrificing signal-to-noise ratio, resolving the contradiction between productivity and measurement precision.
Solution Approach 2:
The imaging system is designed to perform multiple functions within a single acquisition protocol. The pulse sequence is configured to acquire T1-weighted, T2*-weighted, and proton density images using the same data set and acquisition time, making the system universal for multiple contrast types without requiring separate dedicated sequences for each.
2Loss of time
If conventional parallel imaging techniques are used to reduce acquisition time, then the acquisition time decreases, but the ability to acquire multiple contrasts remains limited
Solution Approach 1:
The patent merges multiple contrast acquisitions into a single integrated pulse sequence that uses parallel imaging techniques. By combining T1, T2*, and proton density acquisitions with accelerated parallel imaging, the system achieves both reduced acquisition time and the ability to acquire multiple contrasts simultaneously, resolving the contradiction between time loss and productivity.
3Measurement precision
If a fixed imaging protocol is optimized for a specific tissue contrast, then the image quality for that contrast improves, but the flexibility to acquire other contrasts decreases
Solution Approach 1:
The patent implements a universal imaging protocol that can acquire T1-weighted, T2*-weighted, and proton density images within a single sequence. This multi-functional approach maintains high image quality for all contrast types by optimizing the pulse sequence parameters to accommodate multiple contrasts simultaneously, resolving the contradiction between measurement precision and adaptability.
Solution Approach 2:
The imaging system dynamically adjusts pulse sequence parameters (such as echo times, inversion times, and flip angles) to optimize for multiple contrast types. By changing these parameters within the same acquisition protocol, the system maintains high image quality across different contrast types while preserving flexibility, resolving the contradiction between measurement precision and adaptability.
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 acquisition of multiple T1 and T2* contrasts in the same time as a conventional single contrast acquisition, improving image quality and reducing artifacts, while allowing for quantification of parameters like proton density, T1, and T2* through parametric mapping.
Implementation Method 1
a magnet system configured to generate a static magnetic field about at least a portion of a subject
Implementation Method 2
a radio frequency (RF) system configured to deliver excitation pulses to the subject and acquire data from the subject
Implementation Method 3
a gradient coil system configured to establish at least one magnetic gradient field with respect to the static magnetic field
Data Source
AI summary
Systems and methods for performing fast multi-contrast magnetic resonance imaging (“MRI”) are provided. In general, data are acquired from both multiple echo times (“TEs”) and at multiple effective inversion times (“TIs”). Following the application of a magnetization preparation radio frequency (“RF”) pulse, a plurality of different multi-echo acquisitions are performed, thereby acquiring data from multiple different TEs during different portions of the longitudinal magnetization recovery curve. Data acquisition in these inner encoding loops (i.e., during each multi-echo acquisition) can be accelerated to efficiently provide for the acquisition of multiple contrasts in the time normally required to acquire a single contrast.