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Fast spin echo and fast gradient echo MRI with low acoustic noise
1Commissariat à l'Energie Atomique (CEA), Service Hospitalier Frédéric Joliot (SHFJ), 91401 Orsay, France. hennel@shfj.cea.fr
Journal of Magnetic Resonance Imaging : JMRI
|May 31, 2001
Summary
This study introduces a novel method to significantly reduce acoustic noise in fast Magnetic Resonance Imaging (MRI) sequences. The technique improves upon previous methods, achieving greater noise reduction for clearer imaging.
Area of Science:
- Medical Imaging
- Biophysics
- Acoustics
Background:
- Acoustic noise in Magnetic Resonance Imaging (MRI) is a significant issue affecting patient comfort and image quality.
- Previous research demonstrated noise reduction in standard MRI sequences using sinusoidal gradient ramps.
Purpose of the Study:
- To present an improved method for reducing acoustic noise in fast MRI sequences, specifically Fast Gradient Echo (FLASH) and Fast Spin Echo (RARE).
- To evaluate the effectiveness of the new strategy compared to standard manufacturer sequences and prior sinusoidal ramp methods.
Main Methods:
- The proposed strategy involves using a plateau-free sinusoidal readout pulse and extending phase encoding pulses throughout the readout period.
- This alters k-space sampling to be non-equidistant, necessitating image reconstruction via gridding.
Main Results:
- Acoustic noise reduction of 20-40 dBA was achieved compared to standard MRI sequences.
- This represents a 10-20 dBA improvement over previously proposed sinusoidal ramp methods.
Conclusions:
- The novel approach effectively reduces acoustic noise in fast MRI sequences (FLASH and RARE).
- This method offers a substantial improvement in noise reduction, enhancing the MRI experience and potentially image quality.