MRI Gradient Pulse Time Correction for Artifact Reduction
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Solution Overview
Problem
Time delays in the transmission of gradient pulse signals in nuclear magnetic resonance devices lead to artifacts in MRI images, affecting diagnosis accuracy due to misalignment of time reference points during scanning cycles.
Innovation Solution
A method to correct time by determining and applying a time correction value based on the transmission time delays of gradient pulse signals, adjusting the output times of gradient pulse signals, RF pulse signals, and reception times of magnetic resonance signals to synchronize time reference points within scanning cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If time delays in gradient pulse signal transmission are not corrected, then the scanning process can proceed without additional correction steps, but artifacts are introduced in MRI images and diagnosis accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring and calculating time correction values before the actual scanning process. The system pre-determines the time delays of gradient pulse signals and computes correction values that will be applied during scanning, thereby eliminating artifacts before they affect image quality while maintaining a relatively simple scanning execution process.
Solution Approach 2:
The patent implements feedback by measuring the actual time delays of gradient pulse signals during system operation, comparing these measured delays with expected values, and using the difference to calculate correction values. This feedback mechanism ensures accurate time synchronization without requiring complex real-time adjustments during scanning.
2Measurement precision
If time correction is applied to synchronize time reference points, then artifacts are reduced and diagnosis accuracy is improved, but additional processing steps and computational complexity are introduced
Solution Approach 1:
The system performs time delay measurement and correction value calculation as preliminary actions before scanning. By pre-determining the time correction values based on measured gradient pulse signal delays, the patent achieves precise time reference alignment without introducing complex real-time processing during the scanning operation.
Solution Approach 2:
The patent applies parameter changes by modifying the time parameters of gradient pulse signals, RF pulse signals, and magnetic resonance signal reception times using calculated correction values. This parameter adjustment synchronizes time reference points across different signal types, improving measurement precision while requiring only straightforward arithmetic operations rather than complex processing.
3Manufacturing precision
If transmission time delays of gradient pulse signals are measured and corrected, then time reference points are synchronized and image quality is improved, but the scanning cycle requires additional measurement and calculation operations
Solution Approach 1:
The patent applies preliminary action by completing time delay measurements and correction value calculations before the scanning cycle begins. The system pre-determines all necessary time correction parameters, allowing the actual scanning process to execute efficiently without interruptions for measurement or calculation operations, thus maintaining high productivity while achieving precise time synchronization.
Data Source
AI summary
Methods, systems, and computer-readable storage mediums for correcting time in a nuclear magnetic resonance device are provided. In one aspect, a method includes obtaining respective transmission time delays of three gradient pulse signals that are generated by a three-dimensional gradient subsystem of the nuclear magnetic resonance device and include a slice-selection gradient signal, a phase-encoding gradient signal, and a frequency-encoding gradient signal, determining a time correction value according to the obtained respective transmission time delays of the three gradient pulse signals, and correcting a respective output time of each of the three gradient pulse signals, an output time of a radio-frequency (RF) pulse signal generated by a RF transmitting subsystem of the nuclear magnetic resonance device, and a reception time of a magnetic resonance signal received by a RF receiving subsystem in a scanning cycle according to the determined time correction value.