title: In vivo intrauterine sound pressure and temperature measurements during magnetic resonance imaging (1.5 T) in pregnant ewes.
abstract: OBJECTIVE
  To investigate the influence of several magnetic resonance imaging (MRI) sequences on amniotic fluid temperature and intrauterine sound pressure.
  
  
  METHODS
  Temperature and sound pressure measurements during MRI (1.5 T) in pregnant ewes were done. Linear levels and third octave band spectra were compared.
  
  
  RESULTS
  No significant changes in the temperature of amniotic fluid were observed. Intrauterine summation levels reached peak levels up to 103.0 dB(A) before starting the MRI sequence and levels up to 116.0 dB(A) during a real-time sequence. Evaluating the octave band spectra, peak levels did not exceed 100.0 dB(L).
  
  
  CONCLUSIONS
  Our delimited data revealed no harm for the fetus by an increase in amniotic fluid temperature or hazards for the fetal auditory system by different MRI sequences.
authors.affiliation: Department of Perinatal Medicine, Klinikum rechts der Isar, Technical University Munich, Munich, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Ruckhäberle
authors.forename: S G
authors.initials: SG
authors.lastname: Nekolla
authors.forename: C
authors.initials: C
authors.lastname: Ganter
authors.forename: K T M
authors.initials: KT
authors.lastname: Schneider
authors.forename: A
authors.initials: A
authors.lastname: Peter
authors.forename: A
authors.initials: A
authors.lastname: Raidt
authors.forename: L
authors.initials: L
authors.lastname: Kovacs
authors.forename: S J
authors.initials: SJ
authors.lastname: Brockmeier
authors.forename: M
authors.initials: M
authors.lastname: Schwaiger
authors.forename: R
authors.initials: R
authors.lastname: Oberhoffer
authors.forename: N A
authors.initials: NA
authors.lastname: Papadopulos