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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Accelerating chemical exchange saturation transfer (CEST) MRI by combining compressed sensing and sensitivity

Hye-Young Heo1,2, Yi Zhang1, Dong-Hoon Lee1

  • 1Divison of MR Research, Department of Radiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Magnetic Resonance in Medicine
|February 19, 2016
PubMed
Summary

Accelerated chemical-exchange-saturation-transfer (CEST) imaging is feasible using compressed sensing (CS) and sensitivity encoding (SENSE) at 3 Tesla. This CS-SENSE technique significantly speeds up acquisition without compromising image quality, showing potential for clinical applications.

Keywords:
APTCESTSENSEbrain tumorcompressed sensing

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Radiology

Background:

  • Chemical-exchange-saturation-transfer (CEST) imaging offers valuable insights into tissue physiology.
  • Traditional CEST imaging can be time-consuming, limiting its clinical utility.
  • Accelerated imaging techniques are crucial for improving patient comfort and throughput.

Purpose of the Study:

  • To assess the feasibility of accelerated CEST imaging at 3 Tesla.
  • To evaluate a combined compressed sensing (CS) and sensitivity encoding (SENSE) reconstruction method (CS-SENSE).
  • To determine if CS-SENSE can maintain image quality at accelerated acquisition rates.

Main Methods:

  • Acquired k-space data for CEST imaging in two healthy volunteers and six high-grade glioma patients.
  • Applied a sequential CS and SENSE reconstruction (CS-SENSE) with varying acceleration factors (R).
  • Compared MTRasym (3.5 ppm) signals between CS-SENSE reconstructions and reference images.

Main Results:

  • An acceleration factor of R = 2x2 (CS x SENSE) was achieved in healthy volunteers without compromising MTRasym image quality.
  • MTRasym signals from CS-SENSE reconstruction (R = 2x2) were well-preserved compared to SENSE-only (R=2) reference images.
  • Glioma patient studies showed significantly higher MTRasym signals in tumor cores (P < 0.001) with no significant difference between CS-SENSE (R=2x2) and reference images.

Conclusions:

  • Combining SENSE with CS (R = 2x2) enables significant acceleration of CEST image acquisition.
  • The CS-SENSE technique maintains MTRasym image quality, demonstrating its feasibility.
  • This accelerated CEST imaging approach holds promise for wide-ranging clinical applications.