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k-space undersampling in PROPELLER imaging.

Konstantinos Arfanakis1, Ashish A Tamhane, James G Pipe

  • 1Department of Biomedical Engineering, Illinois Institute of Technology, 10 West 32nd Street, E1-116, Chicago, IL 60616, USA. arfanakis@iit.edu

Magnetic Resonance in Medicine
|February 22, 2005
PubMed
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Undersampling PROPELLER MRI (periodically rotated overlapping parallel lines with enhanced reconstruction) can reduce scan times. Removing whole blades or using asymmetric blades with Hermitian symmetries minimizes artifacts, making MRI faster and clearer.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • PROPELLER MRI offers superior artifact reduction compared to EPI and FSE.
  • However, PROPELLER MRI has longer minimum imaging times than EPI and FSE.
  • Reducing MRI scan time is often achieved by undersampling k-space.

Purpose of the Study:

  • To evaluate the impact of k-space undersampling on PROPELLER MRI image quality.
  • To identify effective undersampling strategies for reducing PROPELLER MRI scan time without significant artifact induction.

Main Methods:

  • Simulated and in vivo PROPELLER MRI datasets were used.
  • Evaluated undersampling by reducing samples per line, lines per blade, or blades per acquisition.
  • Investigated undersampling via whole blade removal and asymmetric blade acquisition utilizing Hermitian symmetries.

Related Experiment Videos

Main Results:

  • Reducing samples per line, lines per blade, or blades per acquisition led to severe artifacts.
  • Removing whole blades reduced imaging time by up to 50% with minimal artifacts (slight blurring).
  • Asymmetric blades with Hermitian symmetry significantly reduced imaging time without artifacts.

Conclusions:

  • PROPELLER MRI undersampling strategies vary in their impact on image quality and scan time.
  • Whole blade removal and asymmetric blade acquisition with Hermitian symmetry are effective methods for accelerating PROPELLER MRI.
  • These optimized undersampling techniques enhance the clinical utility of PROPELLER MRI by reducing scan duration while maintaining image fidelity.