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Respiratory ordered phase encoding (ROPE): a method for reducing respiratory motion artefacts in MR imaging.

D R Bailes, D J Gilderdale, G M Bydder

Journal of Computer Assisted Tomography

|July 1, 1985

Summary

This study introduces a novel magnetic resonance imaging (MRI) method to reduce respiratory artifacts. By using a respiratory signal to order data acquisition, image quality is improved without increasing scan time.

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Area of Science:

Medical Imaging
Biomedical Engineering

Background:

Respiratory motion is a significant source of artifacts in magnetic resonance imaging (MRI).
The spin-warp technique is susceptible to motion-induced artifacts, degrading image quality.

Purpose of the Study:

To develop and describe a method for reducing respiratory artifacts in spin-warp MRI.
To improve the quality of MRI scans affected by patient breathing.

Main Methods:

A respiratory signal is utilized to dynamically determine the order of data acquisition.
Phase encoding gradients are timed to coincide with slow variations in the respiratory signal.
Data collection is synchronized with each imaging sequence cycle.

Main Results:

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The proposed method ensures the respiratory signal varies slowly with respect to the phase encoding gradient's time integral and row number.

This controlled data acquisition minimizes motion-induced artifacts.

Image quality is enhanced without extending the overall scanning duration.

Conclusions:

The described method effectively reduces respiratory artifacts in spin-warp MRI.
This technique offers improved diagnostic accuracy by providing clearer images.
The method is efficient, maintaining standard scan times.