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Modification of the Carr-Purcell sequence for single-shot echo-planar imaging
1Institute of Physics, Jagiellonian University, Krakow, Poland.
Magnetic Resonance in Medicine
|July 1, 1992
Summary
Researchers analyzed radiofrequency (RF) field inhomogeneity artifacts in echo-planar imaging (EPI) using the CPMG sequence. A new modified sequence suppresses these artifacts, simplifying the EPI experiment.
Area of Science:
- Magnetic Resonance Imaging
- Pulse Sequence Design
Background:
- Radiofrequency (RF) field inhomogeneity is a known issue in echo-planar imaging (EPI).
- The Carr-Purcell-Meiboom-Gill (CPMG) sequence is susceptible to artifacts arising from RF inhomogeneity.
Purpose of the Study:
- To analyze artifacts caused by RF field inhomogeneity in EPI using the CPMG sequence.
- To present a modified pulse sequence that suppresses these artifacts.
Main Methods:
- Analysis of artifacts in EPI with the CPMG sequence.
- Development and implementation of a modified sequence with 90-degree phase alternation of pi pulses.
Main Results:
- The modified sequence effectively suppresses spurious signal components caused by RF inhomogeneity.
- Elimination of the need for phase cycling procedures.
- Reduction of the pi-pulsed EPI experiment to a single shot.
Conclusions:
- The proposed modified sequence offers a robust solution for mitigating RF inhomogeneity artifacts in EPI.
- This advancement simplifies experimental procedures and enhances data quality in magnetic resonance imaging.