Abstract #1071

Quantifying T1 and T2* Relaxation Times of Fetal Fat, Fetal Liver, Fetal Kidney, and Amniotic Fluid at 1.5T

Simran Sethi¹, Stephanie A. Giza¹, Mary-Ellen E. Empey¹, Barbra de Vrijer^2,3, and Charles A. McKenzie^1,3

¹Medical Biophysics, Western University, London, ON, Canada, ²Obstetrics and Gynaecology, Western University, London, ON, Canada, ³Division of Maternal, Fetal and Newborn Health, Children’s Health Research Institute, London, ON, Canada

T₁ and T₂^* relaxation times of fetal tissues as a function of gestational age have not been previously published. We acquired fetal MRI data from pregnant women with a gestational age between 29 and 38 weeks. Using DESPOT1 and Quantitative IDEAL, the T₁ and T₂^* relaxation times, respectively, of fetal fat, fetal liver, fetal kidney, and amniotic fluid were quantified as a function of gestational age. Only fetal fat T₁ and T₂^* relaxation times, and fetal liver T₂^* relaxation times changed during this gestational period.

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