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Evaluation of shared-view acquisition using repeated echoes (SHARE): a dual-echo fast spin-echo MR technique
B A Johnson1, E K Fram, B P Drayer
1Department of Neuroradiology, Barrow Neurological Institute, St. Joseph Medical Center, Phoenix, Arizona 85258.
AJNR. American Journal of Neuroradiology
|April 1, 1994
Summary
The SHARE (share-view acquisition using repeated echoes) technique offers comparable diagnostic performance to conventional MRI scans, significantly reducing imaging time. This fast spin-echo method is a viable alternative for brain imaging, potentially allowing for additional sequences.
Area of Science:
- Radiology
- Medical Imaging
Background:
- Conventional long-repetition-time spin-echo magnetic resonance imaging (MRI) is a standard technique for brain imaging.
- Optimizing imaging time while maintaining diagnostic quality is crucial in clinical practice.
Purpose of the Study:
- To evaluate the clinical efficacy of a novel dual-echo fast spin-echo imaging technique, SHARE (share-view acquisition using repeated echoes).
- To compare SHARE imaging with conventional long-repetition-time spin-echo imaging for brain examinations.
Main Methods:
- Fifty randomized patients underwent brain MRI using both conventional spin-echo and SHARE fast spin-echo sequences.
- Two independent neuroradiologists, blinded to clinical history, reviewed the images separately alongside T1-weighted scans.
Main Results:
- Diagnostic concordance between SHARE and conventional spin-echo images was high (96% and 100% for two readers).
- SHARE images achieved comparable contrast, quality, and sensitivity for T2 lesions in one-fourth the time.
- The SHARE technique demonstrated lower sensitivity to hemorrhagic changes.
Conclusions:
- SHARE imaging presents a time-saving and effective alternative to conventional long-repetition-time spin-echo sequences.
- The time efficiency of SHARE may allow for the incorporation of other sequences, such as gradient-echo, when clinically indicated.