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Parallel and nonparallel simultaneous multislice black-blood double inversion recovery techniques for vessel wall
Vitalii V Itskovich1, Venkatesh Mani, Gabor Mizsei
1Imaging Science Laboratories, Mount Sinai School of Medicine, New York, New York 10029-6574, USA.
Journal of Magnetic Resonance Imaging : JMRI
|April 6, 2004
Summary
This study introduces a faster MRI technique for imaging blood vessel walls. The new method significantly reduces scan times for detecting atherosclerotic plaque.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Imaging Technology
- Cardiovascular Imaging
Background:
- Black-blood vessel wall imaging is crucial for diagnosing atherosclerosis.
- Current MRI techniques can be time-consuming, limiting clinical utility.
- Reducing examination times is essential for efficient patient throughput and improved diagnostic capabilities.
Purpose of the Study:
- To significantly reduce MRI examination times for black-blood vessel wall imaging.
- To achieve this reduction by simultaneously acquiring multiple slices and employing parallel imaging techniques.
- To enhance the efficiency of plaque detection and characterization in cardiovascular studies.
Main Methods:
- Developed DIR-rapid acquisition with relaxation enhancement (RARE) techniques capable of imaging up to 10 simultaneous slices.
- Implemented a slab-selective reinversion multislice DIR-RARE sequence with generalized autocalibrating partially parallel acquisitions (GRAPPA).
- Optimized MR parameters using signal-to-noise ratio efficiency factor (SEF) measurements and tested the sequence on healthy subjects and patients with atherosclerosis.
Main Results:
- Slab-selective protocols demonstrated significantly higher SEFs than slice-selective protocols.
- DIR-RARE-GRAPPA protocols showed significantly higher SEFs compared to non-GRAPPA protocols (P < 0.05).
- The DIR-RARE-GRAPPA multislice sequence achieved an 8.35-fold improvement in acquisition time compared to the single-slice DIR-2RARE sequence, with no significant difference in contrast-to-noise ratio (CNR).
Conclusions:
- The developed DIR-RARE-GRAPPA multislice sequence substantially reduces MRI acquisition times for vessel wall imaging.
- These accelerated imaging methods hold significant promise for future MRI studies of atherosclerotic plaque.
- This advancement can lead to more efficient and effective clinical assessment of cardiovascular disease.