MRI Vascular Calcification Imaging with In-Phase Echo Timing
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Solution Overview
Problem
Current MRI techniques fail to rapidly and accurately visualize vascular calcifications due to chemical-shift artifacts, long acquisition times, and poor spatial resolution, making it difficult to distinguish calcifications from other dark structures and prone to motion-induced artifacts.
Innovation Solution
A magnetic resonance imaging (MRI) method using a non-Cartesian k-space sampling trajectory and an echo time that keeps water and fat spins in phase, reducing chemical-shift artifacts while maintaining fat signal intensity, allowing for more reliable visualization of vascular calcifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency-selective RF pulses are applied to reduce chemical-shift artifacts, then chemical-shift artifacts are reduced, but signal from fat spins is reduced
Solution Approach 1:
The patent changes the echo time parameter to an in-phase value where water and fat spins are synchronized, eliminating chemical-shift artifacts without requiring frequency-selective RF pulses that would suppress fat signal. This parameter change allows both artifact reduction and fat signal maintenance simultaneously.
2Measurement precision
If multi-contrast MRI is used to identify vascular calcifications, then identification accuracy is improved, but scan time increases
Solution Approach 1:
The patent merges multiple contrast mechanisms into a single 3D gradient-echo acquisition by using in-phase echo timing and non-Cartesian sampling. This combines the advantages of multiple sequences into one scan, achieving accurate calcification identification without the time penalty of acquiring four separate scans.
Solution Approach 2:
The patent transitions from 2D multi-contrast acquisitions to a 3D single-contrast acquisition with in-phase echo timing. This dimensional change allows comprehensive vascular wall imaging with improved spatial resolution and reduced scan time while maintaining calcification identification accuracy.
3Manufacturing precision
If 3D dark-blood acquisition is used to visualize arterial wall, then spatial resolution is improved, but contrast between calcifications and surrounding structures deteriorates
Solution Approach 1:
The patent changes the echo time parameter to an in-phase value, which fundamentally alters the signal characteristics of fat and water. This creates bright fat signal that provides excellent contrast against dark calcifications and blood, solving the contrast problem while maintaining 3D spatial resolution.
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 effectively suppresses chemical-shift artifacts, improves contrast between soft-tissues, reduces acquisition time, and enhances the robustness against physiologic motion, enabling accurate and rapid identification of vascular calcifications.
Implementation Method 1
magnetic resonance imaging system, pulse sequence, nuclear spin magnetization
Data Source
AI summary
Systems and methods for acquiring magnetic resonance images that accurately depict vascular calcifications, or other objects composed of magnetic susceptibility-shifted substances, in a subject are provided. The images are generally acquired using a pulse sequence that is designed to reduce physiological motion-induced artifacts and to mitigate chemical-shift artifacts from water-fat boundaries. Advantageously, the MRI technique described here suppresses chemical-shift artifacts without significantly reducing the signal intensity from fatty tissues, and thereby allows for more reliable visualization of vascular calcifications.