Fast, simple gradient delay estimation for spiral MRI.

Area of Science:

• Medical Imaging
• Magnetic Resonance Imaging (MRI)
• Signal Processing

Background:

• Timing delays between data acquisition and gradient transmission in MRI cause image degradation, particularly in spiral MRI sequences.
• These delays lead to nonuniform data alteration and significant artifacts in reconstructed images.
• Existing methods for delay mitigation or k-space coordinate measurement are often time-consuming, complex, or require specialized hardware.

Purpose of the Study:

• To propose a fast, simple, and accurate method for measuring independent timing delays on each gradient channel in spiral MRI.
• To enable delay measurement with minimal modification to existing spiral sequences.
• To assess the effectiveness and accuracy of the proposed method.

Main Methods:

• A novel method is introduced to measure timing delays on individual gradient channels.
• The technique requires only minor adjustments to standard spiral MRI sequences.
• Measurements can be performed on any scan subject within six sequence repetition times.

Main Results:

• The proposed method accurately measures independent delays on three gradient channels.
• It offers a significant improvement over existing methods in terms of speed and simplicity.
• The technique is effective for characterizing timing delays in spiral MRI acquisitions.

Conclusions:

• The developed method provides a fast and simple solution for measuring gradient timing delays in spiral MRI.
• This approach minimizes image artifacts by enabling precise delay compensation.
• The technique is broadly applicable and requires minimal changes to existing MRI protocols.