Magnetic Resonance Echo Train Reordering Algorithm Test
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Solution Overview
Problem
Flexible reordering methods in magnetic resonance imaging can lead to artifacts due to large signal jumps between echo trains in the k-space, which are not filled adjacent to each other, causing blurring in images.
Innovation Solution
A test method and device that check the echo train positions in the k-space to ensure small signal differences between adjacent elements, independent of tissue types or imaging tasks, by comparing echo train positions rather than signal intensities, and outputting error messages if permissible differences are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flexible reordering methods are used to fill k-space, then productivity is improved by enabling varied scanning trajectories, but manufacturing precision deteriorates due to large signal jumps causing artifacts and blurring
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors echo train positions and signal intensities during k-space filling, and automatically adjusts the reordering algorithm to prevent excessive signal jumps between adjacent k-space elements, thereby maintaining image quality while preserving flexible scanning trajectories
Solution Approach 2:
The patent changes the parameter of echo train position assignment in the reordering algorithm, introducing constraints that limit the maximum echo train position difference between adjacent k-space elements. This parameter modification allows flexible trajectories while preventing the signal jumps that cause artifacts
2Adaptability or versatility
If flexible reordering algorithms are used, then adaptability is improved by allowing varied scanning trajectories, but reliability deteriorates due to artifacts from large signal jumps
Solution Approach 1:
The system continuously monitors the echo train positions assigned to adjacent k-space elements and provides feedback to the reordering algorithm, automatically correcting trajectories that would result in excessive signal jumps and potential artifacts, thus maintaining both flexibility and reliability
Solution Approach 2:
The patent applies preliminary constraints to the reordering algorithm before k-space filling begins, pre-defining maximum allowable echo train position differences between adjacent elements. This preliminary action ensures that flexible trajectories are planned in advance without compromising image reliability
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
Prevents artifacts by ensuring small signal differences between echo train positions, improving image quality by reducing blurring and allowing for flexible reordering without compromising image clarity.
Implementation Method 1
The body to be examined is usually exposed to a relatively strong basic magnetic field B0, e.g. 3 or 7 Tesla, by means of a basic field magnetic system in a magnetic resonance tomography system. The dynamic effect of the static magnetic field B0 produces a preferred direction of the spins parallel and anti-parallel to the lines of magnetic flux.
Implementation Method 2
Using high-frequency excitation signals, the nuclear spins of specific atoms which are resonantly excited by this high-frequency field are locally tilted by a defined flip angle relative to the lines of magnetic flux of the basic magnetic field.
Implementation Method 3
High-frequency signals (so-called magnetic resonance signals) are emitted during the relaxation, being then received by means of suitable receive antennas and subsequently processed.
Data Source
AI summary
A test method for a reordering algorithm of a 3D spin echo magnetic resonance pulse sequence is provided, in which echo train positions are checked for at least two k-space elements. Further, a non-transitory computer readable medium and a magnetic resonance tomography system which comprises a test device for testing a reordering algorithm of a 3D spin echo magnetic resonance pulse sequence featuring a checking module for checking the echo train position for at least two k-space elements are provided.