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Magn Reson Med. 2017 Apr;77(4):1678-1690. doi: 10.1002/mrm.26231. Epub 2016 Apr 5.

Relaxation properties of human umbilical cord blood at 1.5 Tesla.

Author information

1
Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada.
2
Mouse Imaging Centre, Hospital for Sick Children, Toronto, ON, Canada.
3
Department of Obstetrics and Gynecology, University of Toronto, Toronto, ON, Canada.
4
Institute of Medical Science, University of Toronto, Toronto, ON, Canada.
5
Division of Cardiology, Hospital for Sick Children, Toronto, ON, Canada.
6
Department of Pediatrics and Diagnostic Imaging, University of Toronto, Toronto, ON, Canada.
7
Department of Physiology and Experimental Medicine, Hospital for Sick Children, Toronto, ON, Canada.
8
Labatt Family Heart Centre, Hospital for Sick Children, Toronto, ON, Canada.

Abstract

PURPOSE:

To characterize the MRI relaxation properties of human umbilical cord blood at 1.5 Tesla.

METHODS:

Relaxometry measurements were performed on cord blood specimens (N = 88, derived from six caesarean deliveries) spanning a broad range of hematocrits (Hct = 0.19-0.76) and oxygen saturations (sO2 = 4-100%), to characterize the dependence of T1 and T2 on these blood properties. Adult blood data (N = 31 specimens, derived from two volunteers) were similarly studied to validate our experimental methods by comparison with existing literature. Using biophysical models previously developed for adult blood, new model parameters were estimated, which relate Hct and sO2 to the observed cord blood relaxation times.

RESULTS:

Fitted biophysical models explained more than 90% of the variation in T1 and T2 . In general, T2 relaxation times of cord blood were longer (by up to 35%) than those of adult blood, whereas T1 relaxation times were slightly shorter (by up to 10%).

CONCLUSIONS:

The models and fitted parameters presented here can be used for calibration of future MRI investigations of fetal and neonatal blood physiology. This study is an important step in facilitating accurate, noninvasive assessments of fetal blood oxygen content, a valuable diagnostic parameter in the identification and treatment of fetal hypoxia. Magn Reson Med 77:1678-1690, 2017. © 2016 International Society for Magnetic Resonance in Medicine.

KEYWORDS:

fetus; hematocrit; longitudinal relaxation time; oxygenation; transverse relaxation time; umbilical cord blood

PMID:
27059881
PMCID:
PMC5354618
DOI:
10.1002/mrm.26231
[Indexed for MEDLINE]
Free PMC Article

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