Quantifying Brain Myelin Water Fraction in a Guinea Pig Model of Spontaneous Intrauterine Growth Restriction

Author:

Sethi Simran1ORCID,Friesen‐Waldner Lanette J.1ORCID,Regnault Timothy R.H.234ORCID,McKenzie Charles A.145ORCID

Affiliation:

1. Department of Medical Biophysics Western University London Ontario Canada

2. Department of Obstetrics & Gynaecology Western University London Ontario Canada

3. Department of Physiology & Pharmacology Western University London Ontario Canada

4. Division of Maternal, Fetal and Newborn Health, Children's Health Research Institute Lawson Health Research Institute London Ontario Canada

5. Robarts Research Institute Western University London Ontario Canada

Abstract

BackgroundIntrauterine growth restriction (IUGR) is an obstetrical condition where a fetus has not achieved its genetic potential. A consequence of IUGR is a decrease in brain myelin content. Myelin water imaging (MWI) has been used to assess fetal myelin water fraction (MWF) and might potentially assess myelination changes associated with IUGR.PurposeTo quantify and compare the MWF of non‐IUGR and IUGR fetal guinea pigs (GPs) in late gestation.Study TypeProspective animal model.Animal ModelDunkin‐Hartley GP model of spontaneous IUGR (mean ± SD: 60 ± 1.2 days gestation; 19 IUGR, 52 control).Field Strength/SequenceEight spoiled gradient‐recalled (SPGR) gradient echo volumes (flip angles [α]: 2°–16°), and two sets of eight balanced steady‐state free precession (bSSFP) gradient echo volumes (α: 8° – 64°), at 0° and 180° phase increments, at 3.0 T.AssessmentMWF maps were generated for each fetal GP brain using multicomponent driven equilibrium single pulse observation of T1/T2 (mcDESPOT). MWF was quantified in the fetal corpus callosum (CC), fornix (FOR), parasagittal white matter (PSW), and whole fetal brain.Statistical TestsLinear regression was performed between five fetal IUGR markers (body volume, body‐to‐pregnancy volume ratio, brain‐to‐liver volume ratio, brain‐to‐placenta volume ratio, and brain‐to‐body volume ratio) and MWF (coefficient of determination, R2). A t‐test with a linear mixed model compared the MWF of non‐IUGR and IUGR fetal GPs (significance was determined at α < 0.05).ResultsThe MWF of the control fetuses are (mean ± SD): 0.23 ± 0.02 (CC), 0.31 ± 0.02 (FOR), 0.28 ± 0.02 (PSW), and 0.20 ± 0.01 (whole brain). The MWF of the IUGR fetuses are (mean ± SD): 0.19 ± 0.02 (CC), 0.27 ± 0.01 (FOR), 0.24 ± 0.03 (PSW), and 0.16 ± 0.01 (whole brain). Significant differences in MWF were found between the non‐IUGR and IUGR fetuses in every comparison.Data ConclusionThe mean MWF of IUGR fetal GPs is significantly lower than non‐IUGR fetal GPs.Evidence Level2Technical EfficacyStage 1

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

Wiley

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3