In vivo 1H magnetic resonance spectroscopy of amniotic fluid and fetal lung at 1.5 T: Technical challenges

Dong Hyun Kim, Kiarash Vahidi, Aaron B. Caughey, Fergus V. Coakley, Daniel B. Vigneron, John Kurhanewicz, Ben Mow, Bonnie N. Joe

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Purpose: To identify the major technical challenges associated with in utero single-voxel proton spectroscopy of amniotic fluid and fetal lung and to evaluate the feasibility of performing in utero fetal spectroscopy for fetal lung maturity testing. Materials and Methods: Fetal magnetic resonance (MR) spectroscopy of amniotic fluid and fetal lung were performed at 1.5 T in 8 near-term pregnant women. Presence/absence of lactate and choline peaks was tabulated. Ex vivo spectra were obtained from amniotic fluid samples to investigate and refine sequence parameters. Results: Spectroscopy failed in 3 of 8 cases due to maternal discomfort (n = 1) or fetal gastroschisis (n = 2). Both fetal motion and low signal-to-noise ratio were limiting factors for the remaining 5 clinical in vivo studies at 1.5 T. Ex vivo and in vivo studies suggested feasibility for detecting lactate from amniotic fluid within a reasonable clinical scan time (4-5 minutes). Lactate was detected in 3 of 5 patients. Choline detection was limited and was detected in 1 patient. Conclusion: Minor motion effects can be overcome but continuous fetal motion is problematic. Lactate detection seems clinically feasible; but choline detection requires additional technical development and, potentially, further imaging at a higher field strength because of the low signal-to-noise ratio at 1.5 T.

Original languageEnglish (US)
Pages (from-to)1033-1038
Number of pages6
JournalJournal of Magnetic Resonance Imaging
Volume28
Issue number4
DOIs
StatePublished - Oct 2008
Externally publishedYes

Keywords

  • Amniotic fluid spectroscopy
  • Fetal imaging
  • Fetal lung spectroscopy
  • Lung maturity
  • Respiratory distress syndrome

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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