Gradient Delay Correction in MRI via Partition Interpolation
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Solution Overview
Problem
Current methods for gradient delay time correction in magnetic resonance imaging require additional recording time for calibration data, which can be inefficient and affect image quality due to spatially varying eddy currents.
Innovation Solution
A computer-implemented method that employs acceleration techniques during the recording of calibration data in the partition direction, allowing for reduced resolution in partition direction and interpolation to provide correction data for all partitions, thereby reducing the recording time while maintaining high-quality gradient delay correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration data is recorded for all partitions in partition direction, then gradient delay correction quality is improved, but recording time increases
Solution Approach 1:
The patent applies partial action by recording calibration data for only a subset of partitions (e.g., every fourth partition) rather than all partitions. This reduces the recording time while maintaining sufficient correction quality through interpolation of the missing correction values from the recorded partitions.
Solution Approach 2:
The patent uses interpolation to copy and estimate correction values for partitions where calibration data was not recorded. By calculating correction values from recorded partitions and interpolating them to unrecorded partitions, the system maintains correction quality without requiring direct measurement of all partitions.
2Productivity
If resolution in partition direction is reduced for calibration data, then recording time is reduced, but correction precision for all partitions may deteriorate
Solution Approach 1:
The patent copies correction information from partitions with high-resolution calibration data to partitions with reduced resolution. Through interpolation, correction values are estimated and applied to all partitions, ensuring that even partitions with reduced measurement precision receive accurate correction data.
Solution Approach 2:
The patent changes the resolution parameter for calibration data recording in the partition direction, using lower resolution for calibration while maintaining high resolution for actual magnetic resonance data acquisition. This parameter adjustment optimizes the balance between recording efficiency and correction quality.
3Loss of time
If interpolation is used to provide correction data for all partitions, then recording time is reduced, but correction accuracy for unrecorded partitions may be affected
Solution Approach 1:
The patent uses interpolation to copy correction patterns from recorded partitions to unrecorded partitions. By analyzing the correction values from measured partitions and extrapolating the correction pattern, the system generates accurate correction data for all partitions without requiring direct measurement of each one.
Solution Approach 2:
The patent replaces the mechanical approach of physically recording calibration data for every partition with a computational interpolation method. This substitution uses mathematical algorithms to estimate correction values, achieving both time efficiency and maintained accuracy.
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 the spatially varying eddy current effects, improving the image quality of magnetic resonance data by allowing for time-efficient and high-quality gradient delay correction.
Implementation Method 1
Eddy currents that are generated by gradient pulses can result in temporally and spatially variable field interferences in magnetic resonance devices. Eddy currents that generate a spatially variable magnetic field in the direction of a readout gradient can have an influence on the actual echo time
Implementation Method 2
Eddy currents that are generated by gradient pulses can result in temporally and spatially variable field interferences
Data Source
AI summary
The disclosure relates to gradient delay time correction of magnetic resonance data. For recording the magnetic resonance data, use is made of a three-dimensional recording technique with linear recording trajectories oriented in different readout directions of a readout plane that is perpendicular to a partition direction. Calibration data is recorded which covers a plurality of partitions in partition direction and which describes readout-direction-dependent shifts, caused by delay effects, of measurement points, e.g. sampled k-space sections in the k-space. Correction data is determined by evaluating the calibration data, and the magnetic resonance data is corrected on the basis of the correction data in order to compensate for the delay effects. The calibration data, which covers a coverage region in partition direction, is recorded in a resolved manner in partition direction, and at least one acceleration technique is applied in the partition direction during the recording of the calibration data.