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An introduction to coil array design for parallel MRI.

Michael A Ohliger1, Daniel K Sodickson

  • 1Department of Radiology, Cardiovascular Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA. Mohliger@mit.edu

NMR in Biomedicine
|May 18, 2006
PubMed
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This review details radiofrequency coil array design for parallel MRI, emphasizing how array sensitivities enable spatial encoding. Optimized designs are crucial for improving signal-to-noise ratio and minimizing noise amplification in parallel imaging.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Physics

Background:

  • Parallel MRI techniques depend on radiofrequency coil array sensitivities for spatial information.
  • Effective coil array design is essential for successful parallel MRI implementation.

Purpose of the Study:

  • To provide a comprehensive overview of radiofrequency coil array design principles for parallel MRI.
  • To discuss theoretical and practical aspects of coil array design, spatial encoding, and performance optimization.

Main Methods:

  • Qualitative analysis of coil array spatial encoding concepts (spatial harmonics, aliased pixels, k-space profiles, generalized projections).
  • Quantitative analysis focusing on signal-to-noise ratio (SNR) and noise amplification (g-factor).
  • Review of specific array designs, design considerations, and special topics like depth penetration, adaptive arrays, inductive coupling, and high-field applications.

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Main Results:

  • Coil array sensitivities are fundamental to spatial encoding in parallel MRI.
  • Quantitative analysis involves evaluating baseline SNR and g-factor for reconstructed data.
  • Specific design considerations and advanced topics impact high-performance parallel MRI applications.

Conclusions:

  • Optimized radiofrequency coil array design is critical for advancing parallel MRI.
  • Understanding fundamental limits of spatial encoding guides the development of superior array designs.
  • This review contextualizes current practices and future innovations in parallel MRI coil array technology.