Generalized encoding through the use of selective excitation in accelerated parallel MRI
Walid E Kyriakos1, W Scott Hoge, Dimitris Mitsouras
1Department of Radiology, Children's Hospital and Harvard Medical School, Boston, MA, USA. walid@bwh.harvard.edu
NMR in Biomedicine
|May 18, 2006
Summary
Combining selective radiofrequency (RF) excitation with parallel magnetic resonance imaging (MRI) enhances flexibility. This integration can improve image quality, accelerate scan times, or offer both benefits in MRI applications.
Area of Science:
- Physics
- Medical Imaging
- Biophysics
Background:
- Selective radiofrequency (RF) excitation is a core technique in magnetic resonance imaging (MRI) for applications like slice selection.
- Tailored RF pulses enable complex transverse magnetization patterns, useful for imaging specific geometries or acquiring non-Fourier encoded data.
Purpose of the Study:
- To review and analyze the synergistic combination of selective RF excitation and parallel MRI acquisition techniques.
- To elucidate how this integration offers enhanced flexibility for MRI applications.
Main Methods:
- Review of existing literature on selective RF excitation and parallel MRI.
- Analysis of how combining these techniques impacts data acquisition and reconstruction.
- Exploration of benefits for numerical conditioning and information compaction.
Main Results:
- The combination allows for advantageous manipulation of the reconstruction problem's numerical conditioning.
- It enables compaction of acquired data, leading to improved acceleration rates in parallel MRI.
- Parallel imaging acceleration can be viewed as information compaction, potentially shortening selective excitations.
Conclusions:
- The integration of selective RF excitation with parallel MRI provides significant added flexibility.
- This flexibility can be strategically employed to enhance overall image quality.
- The combined approach facilitates increased imaging speed, offering a dual benefit of improved quality and faster acquisition.
