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Pediatric Radiology

, Volume 48, Issue 8, pp 1139–1151 | Cite as

Optimization of magnetization-prepared rapid gradient echo (MP-RAGE) sequence for neonatal brain MRI

  • Lili He
  • Jinghua Wang
  • Zhong-Lin Lu
  • Beth M. Kline-Fath
  • Nehal A. Parikh
Original Article

Abstract

Background

Sequence optimization in neonates might improve detection sensitivity of abnormalities for a variety of conditions. However this has been historically challenging because tissue properties such as the longitudinal relaxation time and proton density differ significantly between neonates and adults.

Objective

To optimize the magnetization-prepared rapid gradient echo (MP-RAGE) sequence to enhance both signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) efficiencies.

Materials and methods

We optimized neonatal MP-RAGE sequence through (1) reducing receive bandwidth to decrease noise, (2) shortening acquisition train length (acquisition number per repetition time or total number of read-out radiofrequency rephrasing pulses) using slice partial Fourier acquisition and (3) simulating the solution of Bloch’s equation under optimal receive bandwidth and acquisition train length. Using the optimized sequence parameters, we scanned 12 healthy full-term infants within 2 weeks of birth and four preterm infants at 40 weeks’ corrected age.

Results

Compared with a previously published neonatal protocol, we were able to reduce the total scan time by reduce the total scan time by 60% and increase the average SNR efficiency by 160% (P<0.001) and the average CNR efficiency by 26% (P=0.029).

Conclusion

Our in vivo neonatal brain imaging experiments confirmed that both SNR and CNR efficiencies significantly increased with our proposed protocol. Our proposed optimization methodology could be readily extended to other populations (e.g., older children, adults), as well as different organ systems, field strengths and MR sequences.

Keywords

Acquisition train length Brain K-space Magnetic resonance imaging Magnetization-prepared rapid gradient echo sequence Neonates Optimization 

Notes

Acknowledgments

This work was funded in part by National Institutes of Health (NIH) grants R01-NS094200 and R01-NS096037 from the National Institute of Neurological Diseases and Stroke (NAP).

Compliance with ethical standards

Conflicts of interest

None

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Lili He
    • 1
    • 2
    • 3
  • Jinghua Wang
    • 4
    • 5
  • Zhong-Lin Lu
    • 5
  • Beth M. Kline-Fath
    • 4
  • Nehal A. Parikh
    • 1
    • 2
    • 3
  1. 1.Perinatal Institute, Department of PediatricsCincinnati Children’s Hospital Medical CenterCincinnatiUSA
  2. 2.Pediatric Neuroimaging Research ConsortiumCincinnati Children’s Hospital Medical CenterCincinnatiUSA
  3. 3.The Research Institute at Nationwide Children’s HospitalColumbusUSA
  4. 4.Department of RadiologyUniversity of Cincinnati College of MedicineCincinnatiUSA
  5. 5.Center for Cognitive and Behavioral Brain ImagingThe Ohio State UniversityColumbusUSA

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