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Quantitative fetal MRI

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https://www.readbyqxmd.com/read/28304179/discrepancy-in-fetal-head-biometry-between-ultrasound-and-mri-in-suspected-microcephalic-fetuses
#1
Gal Yaniv, Eldad Katorza, Vered Tsehmaister Abitbol, Arik Eisenkraft, Ronen Bercovitz, Salim Bader, Chen Hoffmann
Background Microcephaly is one of the most common fetal structural abnormalities, and prenatal microcephaly is considered a group I malformation of cortical development diagnosed according to ultrasound (US) skull measurements. Purpose To evaluate the agreement between fetal head US and magnetic resonance imaging (MRI) biometric measurements of suspected microcephalic fetuses. Material and Methods This institutional review board-approved retrospective study with waived informed consent included 180 pregnant women and was conducted at our medical center from March 2011 to April 2013...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28269170/sulcal-curve-extraction-using-laplace-beltrami-eigenfunction-level-sets
#2
Rosita Shishegar, Mary Tolcos, David W Walker, Leigh A Johnston
The complexity of the human cortex is demonstrated in the intricate pattern of gyri and sulci that arise from the cortical folding process during development. Quantitative assessment of cortical folding is important in the definition of normal brain development and provides insight into neurodevelopmental disorders. In this work, a method for sulcal curve extraction is proposed that combines the advantages of previously proposed depth based and curvature based methods. The technique, derived from Laplace Beltrami eigenfunction level sets, maps mean curvature on the level sets, and incorporates depth information using extracted sulci and gyri, a characteristic previously attributed only to depth based methods...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28252405/placenta-maps-in-utero-placental-health-assessment-of-the-human-fetus
#3
Haichao Miao, Gabriel Mistelbauer, Alexey Karimov, Amir Alansary, Alice Davidson, David Lloyd, Mellisa Damodaram, Lisa Story, Jana Hutter, Joseph Hajnal, Mary Rutherford, Bernhard Preim, Bernhard Kainz, M Eduard Groller
The human placenta is essential for the supply of the fetus. To monitor the fetal development, imaging data is acquired using ultrasound (US). Although it is currently the gold-standard in fetal imaging, it might not capture certain abnormalities of the placenta. Magnetic resonance imaging (MRI) is a safe alternative for the in utero examination while acquiring the fetus data in higher detail. Nevertheless, there is currently no established procedure for assessing the condition of the placenta and consequently the fetal health...
February 24, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28227400/sulcal-curve-extraction-using-laplace-beltrami-eigenfunction-level-sets
#4
Rosita Shishegar, Mary Tolcos, David W Walker, Leigh A Johnston, Rosita Shishegar, Mary Tolcos, David W Walker, Leigh A Johnston, David W Walker, Mary Tolcos, Leigh A Johnston, Rosita Shishegar
The complexity of the human cortex is demonstrated in the intricate pattern of gyri and sulci that arise from the cortical folding process during development. Quantitative assessment of cortical folding is important in the definition of normal brain development and provides insight into neurodevelopmental disorders. In this work, a method for sulcal curve extraction is proposed that combines the advantages of previously proposed depth based and curvature based methods. The technique, derived from Laplace Beltrami eigenfunction level sets, maps mean curvature on the level sets, and incorporates depth information using extracted sulci and gyri, a characteristic previously attributed only to depth based methods...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28195417/toward-the-automatic-quantification-of-in-utero-brain-development-in-3d-structural-mri-a-review
#5
REVIEW
Oualid M Benkarim, Gerard Sanroma, Veronika A Zimmer, Emma Muñoz-Moreno, Nadine Hahner, Elisenda Eixarch, Oscar Camara, Miguel Angel González Ballester, Gemma Piella
Investigating the human brain in utero is important for researchers and clinicians seeking to understand early neurodevelopmental processes. With the advent of fast magnetic resonance imaging (MRI) techniques and the development of motion correction algorithms to obtain high-quality 3D images of the fetal brain, it is now possible to gain more insight into the ongoing maturational processes in the brain. In this article, we present a review of the major building blocks of the pipeline toward performing quantitative analysis of in vivo MRI of the developing brain and its potential applications in clinical settings...
February 14, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28152240/spatiotemporal-alignment-of-in-utero-bold-mri-series
#6
Esra Abaci Turk, Jie Luo, Borjan Gagoski, Javier Pascau, Carolina Bibbo, Julian N Robinson, P Ellen Grant, Elfar Adalsteinsson, Polina Golland, Norberto Malpica
PURPOSE: To present a method for spatiotemporal alignment of in-utero magnetic resonance imaging (MRI) time series acquired during maternal hyperoxia for enabling improved quantitative tracking of blood oxygen level-dependent (BOLD) signal changes that characterize oxygen transport through the placenta to fetal organs. MATERIALS AND METHODS: The proposed pipeline for spatiotemporal alignment of images acquired with a single-shot gradient echo echo-planar imaging includes 1) signal nonuniformity correction, 2) intravolume motion correction based on nonrigid registration, 3) correction of motion and nonrigid deformations across volumes, and 4) detection of the outlier volumes to be discarded from subsequent analysis...
February 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27799276/complex-trajectories-of-brain-development-in-the-healthy-human-fetus
#7
Nickie N Andescavage, Adre du Plessis, Robert McCarter, Ahmed Serag, Iordanis Evangelou, Gilbert Vezina, Richard Robertson, Catherine Limperopoulos
This study characterizes global and hemispheric brain growth in healthy human fetuses during the second half of pregnancy using three-dimensional MRI techniques. We studied 166 healthy fetuses that underwent MRI between 18 and 39 completed weeks gestation. We created three-dimensional high-resolution reconstructions of the brain and calculated volumes for left and right cortical gray matter (CGM), fetal white matter (FWM), deep subcortical structures (DSS), and the cerebellum. We calculated the rate of growth for each tissue class according to gestational age and described patterns of hemispheric growth...
October 31, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27749392/combined-ultrasound-and-exome-sequencing-approach-recognizes-opitz-g-bbb-syndrome-in-two-malformed-fetuses
#8
Anna Maria Pinto, Valentina Imperatore, Laura Bianciardi, Margherita Baldassarri, Paolo Galluzzi, Simone Furini, Giovanni Centini, Alessandra Renieri, Francesca Mari
Orofacial clefts are the most common congenital craniofacial anomalies and can occur as an isolated defect or be associated with other anomalies such as posterior fossa anomalies as a part of several genetic syndromes. We report two consecutive voluntary pregnancy interruptions in a nonconsanguineous couple following the fetal ultrasound finding of cleft lip and palate and posterior fossa anomalies confirmed by means of post-termination examination on the second fetus. The quantitative fluorescent PCR, the karyotype, and the comparative genomic hybridization-array analysis after amniocentesis were normal...
January 2017: Clinical Dysmorphology
https://www.readbyqxmd.com/read/27510837/detecting-default-mode-networks-in-utero-by-integrated-4d-fmri-reconstruction-and-analysis
#9
Sharmishtaa Seshamani, Anna I Blazejewska, Susan Mckown, Jason Caucutt, Manjiri Dighe, Christopher Gatenby, Colin Studholme
Recently, there has been considerable interest, especially for in utero imaging, in the detection of functional connectivity in subjects whose motion cannot be controlled while in the MRI scanner. These cases require two advances over current studies: (1) multiecho acquisitions and (2) post processing and reconstruction that can deal with significant between slice motion during multislice protocols to allow for the ability to detect temporal correlations introduced by spatial scattering of slices into account...
November 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27498089/a-discriminative-feature-selection-approach-for-shape-analysis-application-to-fetal-brain-cortical-folding
#10
J Pontabry, F Rousseau, C Studholme, M Koob, J-L Dietemann
The development of post-processing reconstruction techniques has opened new possibilities for the study of in-utero fetal brain MRI data. Recent cortical surface analysis have led to the computation of quantitative maps characterizing brain folding of the developing brain. In this paper, we describe a novel feature selection-based approach that is used to extract the most discriminative and sparse set of features of a given dataset. The proposed method is used to sparsely characterize cortical folding patterns of an in-utero fetal MR dataset, labeled with heterogeneous gestational age ranging from 26 weeks to 34 weeks...
January 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/27413248/unsupervised-fetal-cortical-surface-parcellation
#11
Sonia Dahdouh, Catherine Limperopoulos
At the core of many neuro-imaging studies, atlas-based brain parcellations are used for example to study normal brain evolution across the lifespan. These atlases rely on the assumption that the same anatomical features are present on all subjects to be studied and that these features are stable enough to allow meaningful comparisons between different brain surfaces and structures These methods, however, often fail when applied to fetal MRI data, due to the lack of consistent anatomical features present across gestation...
February 27, 2016: Proceedings of SPIE
https://www.readbyqxmd.com/read/27254315/accelerated-mri-of-the-fetal-heart-using-compressed-sensing-and-metric-optimized-gating
#12
Christopher W Roy, Mike Seed, Christopher K Macgowan
PURPOSE: To develop and validate a method for accelerated time-resolved imaging of the fetal heart using a combination of compressed sensing (CS) and metric optimized gating (MOG). THEORY AND METHODS: Joint optimization of CS and MOG reconstructions was used to suppress competing artifact from random undersampling and ungated cardiac motion. Retrospectively and prospectively undersampled adult and fetal data were used to validate the proposed reconstruction algorithm qualitatively based on visual assessment, and quantitatively based on reconstruction error, blur, and MOG timing error...
June 2, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27189488/magnetic-resonance-angiography-of-fetal-vasculature-at-3-0%C3%A2-t
#13
Jaladhar Neelavalli, Uday Krishnamurthy, Pavan K Jella, Swati S Mody, Brijesh K Yadav, Kelly Hendershot, Edgar Hernandez-Andrade, Lami Yeo, Maria D Cabrera, Ewart M Haacke, Sonia S Hassan, Roberto Romero
Magnetic resonance angiography has not been used much previously for visualizing fetal vessels in utero for reasons that include a contraindication for the use of exogenous contrast agents, maternal respiratory motion and fetal motion. In this work, we report the feasibility of using an appropriately modified clinical time-of-flight magnetic resonance imaging sequence for non-contrast angiography of human fetal and placental vessels at 3.0 T. Using this 2D angiography technique, it is possible to visualize fetal vascular networks in late pregnancy...
December 2016: European Radiology
https://www.readbyqxmd.com/read/27121379/quantification-of-maceration-changes-using-post-mortem-mri-in-fetuses
#14
P Montaldo, S Addison, V Oliveira, P J Lally, A M Taylor, N J Sebire, S Thayyil, O J Arthurs
BACKGROUND: Post mortem imaging is playing an increasingly important role in perinatal autopsy, and correct interpretation of imaging changes is paramount. This is particularly important following intra-uterine fetal death, where there may be fetal maceration. The aim of this study was to investigate whether any changes seen on a whole body fetal post mortem magnetic resonance imaging (PMMR) correspond to maceration at conventional autopsy. METHODS: We performed pre-autopsy PMMR in 75 fetuses using a 1...
April 27, 2016: BMC Medical Imaging
https://www.readbyqxmd.com/read/26941612/quantitative-and-qualitative-analysis-of-transient-fetal-compartments-during-prenatal-human-brain-development
#15
Lana Vasung, Claude Lepage, Milan Radoš, Mihovil Pletikos, Jennifer S Goldman, Jonas Richiardi, Marina Raguž, Elda Fischi-Gómez, Sherif Karama, Petra S Huppi, Alan C Evans, Ivica Kostovic
The cerebral wall of the human fetal brain is composed of transient cellular compartments, which show characteristic spatiotemporal relationships with intensity of major neurogenic events (cell proliferation, migration, axonal growth, dendritic differentiation, synaptogenesis, cell death, and myelination). The aim of the present study was to obtain new quantitative data describing volume, surface area, and thickness of transient compartments in the human fetal cerebrum. Forty-four postmortem fetal brains aged 13-40 postconceptional weeks (PCW) were included in this study...
2016: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/26599502/functional-imaging-of-the-nonhuman-primate-placenta-with-endogenous-blood-oxygen-level-dependent-contrast
#16
Matthias C Schabel, Victoria H J Roberts, Jamie O Lo, Sarah Platt, Kathleen A Grant, Antonio E Frias, Christopher D Kroenke
PURPOSE: To characterize spatial patterns of T2* in the placenta of the rhesus macaque (Macaca mulatta), to correlate these patterns with placental perfusion determined using dynamic contrast-enhanced MRI (DCE-MRI), and to evaluate the potential for using the blood oxygen level-dependent effect to quantify placental perfusion without the use of exogenous contrast reagent. METHODS: MRI was performed on three pregnant rhesus macaques at gestational day 110. Multiecho spoiled gradient echo measurements were used to compute maps of T2*...
November 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/26562179/early-development-of-the-fetal-central-sulcus-on-7-0t-magnetic-resonance-imaging
#17
Haidong Zhang, Zhonghe Zhang, Xuntao Yin, Jinfeng Zhan, Zhenmei Zhao, Yuchun Tang, Chao Liu, Shuwei Liu, Shizhen Zhong
In the previous studies, the criterion for deciding the occurrence time of the fetal central sulcus (CS) on magnetic resonance imaging (MRI) is based on the observation by the eyes. There have been no existing quantitative standards or numerical criteria in this field. In this study, we reconstructed the three-dimension (3D) images of the fetal brain based on the 7.0T MR images of 45 Chinese fetal specimens from the 11 to 22 weeks of gestational age (GA). Then we obtained data by measuring the maximum depth and length of the CS so as to analyze the early developmental pattern of it...
February 2016: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/26372018/maternal-fetal-attachment-in-blind-women-using-physical-model-from-three-dimensional-ultrasound-and-magnetic-resonance-scan-data-six-serious-cases
#18
Heron Werner, Jorge Lopes, Gabriele Tonni, Edward Araujo Júnior
OBJECTIVE: The objective of this study is to assess the maternal-fetal attachment (MFA) in six blind pregnant women by means three-dimensional (3D) physical models from 3D ultrasound and magnetic resonance imaging (MRI) scan data. METHODS: We performed a prospective observational cross-sectional study with six blind pregnant women who performed 3D ultrasound and MRI exams to build 3D physical models for their fetuses. The MFA was assessed quantitatively by means a questionnaire of three questions, each one with a score ranging from 0 to 3...
2016: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/26129128/tu-f-campus-i-03-quantitative-cardiac-mri-reveals-functional-abnormalities-in-intrauterine-growth-restricted-iugr-baboons
#19
G Clarke, J Li, A Kuo, P Nathanielsz
PURPOSE: Developmental programming occurs in utero, when epigenetic adaptations Result in offspring phenotypes that lead to health consequences persisting throughout life. Programming of cardiac health, due to prenatal malnutrition, has been reported in rodents but not in primate species. Our aim was to determine IUGR is associated with impaired cardiac function in later life in a baboon model. METHODS: Intrauterine growth restricted (IUGR, mothers were subjected to a 30% calories reduction) baboons were scanned with cine cardiac MRI measuring ejection fraction, left ventricular (LV) volumes, LV peak filling rate (LVPFR) and the LV 3D sphericity index (3DSI)...
June 2015: Medical Physics
https://www.readbyqxmd.com/read/26072252/an-efficient-total-variation-algorithm-for-super-resolution-in-fetal-brain-mri-with-adaptive-regularization
#20
Sébastien Tourbier, Xavier Bresson, Patric Hagmann, Jean-Philippe Thiran, Reto Meuli, Meritxell Bach Cuadra
Although fetal anatomy can be adequately viewed in new multi-slice MR images, many critical limitations remain for quantitative data analysis. To this end, several research groups have recently developed advanced image processing methods, often denoted by super-resolution (SR) techniques, to reconstruct from a set of clinical low-resolution (LR) images, a high-resolution (HR) motion-free volume. It is usually modeled as an inverse problem where the regularization term plays a central role in the reconstruction quality...
September 2015: NeuroImage
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